Quarterly report pursuant to Section 13 or 15(d)

Securities - Expected Maturity (Details)

v2.4.0.8
Securities - Expected Maturity (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]    
Held-to-maturity Securities, Debt Maturities, within One Year, Net Carrying Amount $ 6 [1]  
Held-to-maturity Securities, Debt Maturities, Yield, within One Year 5.00% [1],[2]  
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount 76 [1]  
Held-to-maturity Securities, Debt Maturities, Yield, after One Through Five Years 2.29% [1],[2]  
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount 53,394 [1]  
Held-to-maturity Securities, Debt Maturities, Yield, after Five Through Ten Years 2.56% [1],[2]  
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount 1,173 [1]  
Held-to-maturity Securities, Debt Maturities, Yield, after Ten Years 2.67% [1],[2]  
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount 54,649 [1] 49,481
Held-to-maturity Securities, Debt Maturities, Yield 2.56% [1],[2]  
Debt Securities Carried at Fair Value, Debt Maturities, Fair Value [Abstract]    
Debt Securities Carried at Fair Value 266,349 310,850
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]    
Held-to-maturity Securities, Debt Maturities, within One Year, Fair Value 6 [1]  
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Fair Value 76 [1]  
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Fair Value 51,643 [1]  
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value 1,126 [1]  
US Government Corporations and Agencies Securities [Member]
   
Debt Securities Carried at Fair Value, Debt Maturities, Amortized Cost Basis [Abstract]    
Debt Securities Carried at Fair Value, Debt Maturities, Next Twelve Months, Amortized Cost Basis 544  
Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year 0.62% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis 810  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years 2.22% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis 1,505  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years 4.25% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis 13  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years 2.72% [2]  
Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis 2,872  
Debt Securities Carried at Fair Value, Debt Maturities, Yield 2.98% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Fair Value [Abstract]    
Debt Securities Carried at Fair Value, Debt Maturities, Next Twelve Months, Fair Value 546  
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value 830  
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value 1,582  
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value 13  
Debt Securities Carried at Fair Value 2,971  
Debt Securities [Member]
   
Debt Securities Carried at Fair Value, Debt Maturities, Amortized Cost Basis [Abstract]    
Debt Securities Carried at Fair Value, Debt Maturities, Next Twelve Months, Amortized Cost Basis 24,772  
Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year 1.42% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis 38,912  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years 2.62% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis 127,777  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years 3.11% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis 77,188  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years 2.85% [2]  
Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis 268,649  
Debt Securities Carried at Fair Value, Debt Maturities, Yield 2.81% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Fair Value [Abstract]    
Debt Securities Carried at Fair Value, Debt Maturities, Next Twelve Months, Fair Value 24,814  
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value 39,311  
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value 127,208  
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value 75,016  
Debt Securities Carried at Fair Value 266,349  
Taxable Securities [Member]
   
Debt Securities Carried at Fair Value, Debt Maturities, Amortized Cost Basis [Abstract]    
Debt Securities Carried at Fair Value, Debt Maturities, Next Twelve Months, Amortized Cost Basis 24,336  
Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year 1.42% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis 37,037  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years 2.68% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis 125,986  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years 3.12% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis 76,026  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years 2.88% [2]  
Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis 263,385  
Debt Securities Carried at Fair Value, Debt Maturities, Yield 2.84% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Fair Value [Abstract]    
Debt Securities Carried at Fair Value, Debt Maturities, Next Twelve Months, Fair Value 24,378  
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value 37,431  
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value 125,429  
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value 73,877  
Debt Securities Carried at Fair Value 261,115  
Agency Securities [Member]
   
Debt Securities Carried at Fair Value, Debt Maturities, Amortized Cost Basis [Abstract]    
Debt Securities Carried at Fair Value, Debt Maturities, Next Twelve Months, Amortized Cost Basis 14  
Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year 4.58% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis 16,868  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years 2.89% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis 99,186  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years 3.10% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis 74,405  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years 2.90% [2]  
Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis 190,473  
Debt Securities Carried at Fair Value, Debt Maturities, Yield 3.01% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Fair Value [Abstract]    
Debt Securities Carried at Fair Value, Debt Maturities, Next Twelve Months, Fair Value 16  
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value 17,052  
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value 98,361  
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value 72,222  
Debt Securities Carried at Fair Value 187,651  
Collateralized Mortgage Obligations [Member]
   
Debt Securities Carried at Fair Value, Debt Maturities, Amortized Cost Basis [Abstract]    
Debt Securities Carried at Fair Value, Debt Maturities, Next Twelve Months, Amortized Cost Basis 1,525  
Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year 0.04% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis 6,315  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years 1.48% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis 19,816  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years 3.26% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis 12  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years 1.39% [2]  
Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis 27,668  
Debt Securities Carried at Fair Value, Debt Maturities, Yield 2.67% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Fair Value [Abstract]    
Debt Securities Carried at Fair Value, Debt Maturities, Next Twelve Months, Fair Value 1,533  
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value 6,300  
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value 20,052  
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value 13  
Debt Securities Carried at Fair Value 27,898  
Residential Mortgage Backed Securities [Member]
   
Debt Securities Carried at Fair Value, Debt Maturities, Amortized Cost Basis [Abstract]    
Debt Securities Carried at Fair Value, Debt Maturities, Next Twelve Months, Amortized Cost Basis 366  
Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year 4.80% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis 3,788  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years 4.54% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis 1,868  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years 3.51% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis 766  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years 2.82% [2]  
Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis 6,788  
Debt Securities Carried at Fair Value, Debt Maturities, Yield 4.07% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Fair Value [Abstract]    
Debt Securities Carried at Fair Value, Debt Maturities, Next Twelve Months, Fair Value 373  
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value 3,892  
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value 1,867  
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value 797  
Debt Securities Carried at Fair Value 6,929  
Commercial Mortgage Backed Securities [Member]
   
Debt Securities Carried at Fair Value, Debt Maturities, Amortized Cost Basis [Abstract]    
Debt Securities Carried at Fair Value, Debt Maturities, Next Twelve Months, Amortized Cost Basis 1,721  
Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year 5.08% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis 736  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years 5.46% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis 1,092  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years 2.51% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis 18  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years 3.45% [2]  
Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis 3,567  
Debt Securities Carried at Fair Value, Debt Maturities, Yield 4.37% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Fair Value [Abstract]    
Debt Securities Carried at Fair Value, Debt Maturities, Next Twelve Months, Fair Value 1,759  
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value 778  
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value 1,030  
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value 18  
Debt Securities Carried at Fair Value 3,585  
Foreign Securities [Member]
   
Debt Securities Carried at Fair Value, Debt Maturities, Amortized Cost Basis [Abstract]    
Debt Securities Carried at Fair Value, Debt Maturities, Next Twelve Months, Amortized Cost Basis 15,411  
Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year 1.02% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis 2,152  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years 3.91% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis 152  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years 3.06% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis 8  
Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis 17,723  
Debt Securities Carried at Fair Value, Debt Maturities, Yield 1.38% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Fair Value [Abstract]    
Debt Securities Carried at Fair Value, Debt Maturities, Next Twelve Months, Fair Value 15,396  
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value 2,185  
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value 157  
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value 8  
Debt Securities Carried at Fair Value 17,746  
Corporate Bond Securities [Member]
   
Debt Securities Carried at Fair Value, Debt Maturities, Amortized Cost Basis [Abstract]    
Debt Securities Carried at Fair Value, Debt Maturities, Next Twelve Months, Amortized Cost Basis 442  
Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year 2.49% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis 564  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years 2.66% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis 144  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years 4.31% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis 2  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years 6.34% [2]  
Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis 1,152  
Debt Securities Carried at Fair Value, Debt Maturities, Yield 2.79% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Fair Value [Abstract]    
Debt Securities Carried at Fair Value, Debt Maturities, Next Twelve Months, Fair Value 446  
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value 573  
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value 148  
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value 3  
Debt Securities Carried at Fair Value 1,170  
Other Debt Obligations [Member]
   
Debt Securities Carried at Fair Value, Debt Maturities, Amortized Cost Basis [Abstract]    
Debt Securities Carried at Fair Value, Debt Maturities, Next Twelve Months, Amortized Cost Basis 4,313  
Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year 1.61% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis 5,804  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years 1.45% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis 2,223  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years 1.97% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis 802  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years 1.04% [2]  
Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis 13,142  
Debt Securities Carried at Fair Value, Debt Maturities, Yield 1.57% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Fair Value [Abstract]    
Debt Securities Carried at Fair Value, Debt Maturities, Next Twelve Months, Fair Value 4,309  
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value 5,821  
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value 2,232  
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value 803  
Debt Securities Carried at Fair Value 13,165  
Tax-exempt securities [Member]
   
Debt Securities Carried at Fair Value, Debt Maturities, Amortized Cost Basis [Abstract]    
Debt Securities Carried at Fair Value, Debt Maturities, Next Twelve Months, Amortized Cost Basis 436  
Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year 1.21% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis 1,875  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years 1.56% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis 1,791  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years 1.91% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis 1,162  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years 0.77% [2]  
Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis 5,264  
Debt Securities Carried at Fair Value, Debt Maturities, Yield 1.57% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Fair Value [Abstract]    
Debt Securities Carried at Fair Value, Debt Maturities, Next Twelve Months, Fair Value 436  
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value 1,880  
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value 1,779  
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value 1,139  
Debt Securities Carried at Fair Value $ 5,234  
[1] Substantially all U.S. agency MBS.
[2] Average yield is computed using the effective yield of each security at the end of the period, weighted based on the amortized cost of each security. The effective yield considers the contractual coupon, amortization of premiums and accretion of discounts, and excludes the effect of related hedging derivatives.