Quarterly report pursuant to Section 13 or 15(d)

Securities - Expected Maturity (Details)

v2.4.0.6
Securities - Expected Maturity (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 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 345 [1]  
Held-to-maturity Securities, Debt Maturities, Yield, after One Through Five Years 2.40% [1],[2]  
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount 49,121 [1]  
Held-to-maturity Securities, Debt Maturities, Yield, after Five Through Ten Years 2.50% [1],[2]  
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount 105 [1]  
Held-to-maturity Securities, Debt Maturities, Yield, after Ten Years 1.44% [1],[2]  
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount 49,577 [1]  
Held-to-maturity Securities, Debt Maturities, Yield 2.50% [1],[2]  
Debt Securities Carried at Fair Value, Debt Maturities, Fair Value [Abstract]    
Debt Securities Carried at Fair Value 305,132 310,850
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 344 [1]  
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Fair Value 49,318 [1]  
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value 106 [1]  
Held-to-maturity Securities, Debt Maturities, Fair Value 49,774 [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 568  
Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year 0.73% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis 777  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years 2.14% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis 5,123  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years 2.78% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis 14,554  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years 3.01% [2]  
Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis 21,022  
Debt Securities Carried at Fair Value, Debt Maturities, Yield 2.86% [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 571  
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value 804  
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value 5,323  
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value 14,602  
Debt Securities Carried at Fair Value 21,300  
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 17,463  
Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year 1.13% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis 60,854  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years 2.79% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis 176,065  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years 3.01% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis 45,367  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years 2.60% [2]  
Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis 299,749  
Debt Securities Carried at Fair Value, Debt Maturities, Yield 2.80% [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 17,500  
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value 61,746  
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value 180,629  
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value 45,257  
Debt Securities Carried at Fair Value 305,132  
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 17,422  
Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year 1.13% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis 58,675  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years 2.84% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis 175,072  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years 3.01% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis 43,973  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years 2.65% [2]  
Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis 295,142  
Debt Securities Carried at Fair Value, Debt Maturities, Yield 2.82% [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 17,456  
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value 59,565  
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value 179,635  
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value 43,894  
Debt Securities Carried at Fair Value 300,550  
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 4  
Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year 5.00% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis 31,415  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years 3.10% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis 140,985  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years 2.95% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis 27,859  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years 2.47% [2]  
Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis 200,263  
Debt Securities Carried at Fair Value, Debt Maturities, Yield 2.91% [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  
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value 31,863  
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value 143,922  
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value 27,657  
Debt Securities Carried at Fair Value 203,446  
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 10  
Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year 6.99% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis 11,120  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years 1.30% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis 23,328  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years 3.44% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis 15  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years 1.63% [2]  
Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis 34,473  
Debt Securities Carried at Fair Value, Debt Maturities, Yield 2.71% [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 10  
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value 11,076  
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value 24,618  
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value 15  
Debt Securities Carried at Fair Value 35,719  
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 620  
Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year 4.50% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis 4,740  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years 4.26% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis 2,670  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years 4.10% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis 561  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years 4.88% [2]  
Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis 8,591  
Debt Securities Carried at Fair Value, Debt Maturities, Yield 4.28% [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 618  
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value 4,865  
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value 2,746  
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value 648  
Debt Securities Carried at Fair Value 8,877  
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 1,032  
Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year 5.26% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis 2,463  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years 6.10% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis 130  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years 2.95% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis 17  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years 4.46% [2]  
Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis 3,642  
Debt Securities Carried at Fair Value, Debt Maturities, Yield 5.72% [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 1,076  
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value 2,712  
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value 131  
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value 18  
Debt Securities Carried at Fair Value 3,937  
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 13,300  
Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year 0.56% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis 1,331  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years 5.90% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis 157  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years 2.42% [2]  
Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis 14,788  
Debt Securities Carried at Fair Value, Debt Maturities, Yield 1.07% [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 13,285  
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value 1,384  
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value 163  
Debt Securities Carried at Fair Value 14,832  
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 282  
Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year 3.00% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis 778  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years 2.64% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis 186  
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 103  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years 1.10% [2]  
Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis 1,349  
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 287  
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value 793  
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value 208  
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value 97  
Debt Securities Carried at Fair Value 1,385  
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 1,606  
Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year 1.49% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis 6,051  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years 1.33% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis 2,493  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years 2.09% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis 864  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years 1.09% [2]  
Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis 11,014  
Debt Securities Carried at Fair Value, Debt Maturities, Yield 1.50% [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 1,605  
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value 6,068  
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value 2,524  
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value 857  
Debt Securities Carried at Fair Value 11,054  
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 41  
Debt Securities Carried at Fair Value Debt Maturities, Yield, Within One Year 2.69% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Amortized Cost Basis 2,179  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after One Through Five Years 1.23% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Amortized Cost Basis 993  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Five Through Ten Years 2.09% [2]  
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Amortized Cost Basis 1,394  
Debt Securities Carried at Fair Value, Debt Maturities, Yield, after Ten Years 1.09% [2]  
Debt Securties Carried at Fair Value, Debt Maturities, Amortized Cost Basis 4,607  
Debt Securities Carried at Fair Value, Debt Maturities, Yield 1.51% [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 44  
Debt Securities Carried at Fair Value, Debt Maturities, Year Two Through Five, Fair Value 2,181  
Debt Securities Carried at Fair Value, Debt Maturities, Year Six Through Ten, Fair Value 994  
Debt Securities Carried at Fair Value, Debt Maturities, after Ten Years, Fair Value 1,363  
Debt Securities Carried at Fair Value $ 4,582  
[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.