Quarterly report pursuant to Section 13 or 15(d)

Securities - Gross Unrealized Losses (Details)

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Securities - Gross Unrealized Losses (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Securities
Dec. 31, 2012
Securities
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value $ 129,269 [1] $ 26,336 [2]
Less than Twelve Months, Gross Unrealized Losses (3,273) [1] (279) [2]
Twelve Months or Longer, Fair Value 8,461 [1] 16,314 [2]
Twelve Months or Longer, Gross Unrealized Losses (314) [1] (381) [2]
Total, Fair Value 137,730 [1] 42,650 [2]
Total, Gross Unrealized Losses (3,587) [1] (660) [2]
Table Details [Abstract]    
Number of Available for Sale Securities Amortized Cost Exceeds Fair Value 4,900 2,600
Available for Sale Securities Amortized Cost Exceeding Fair Value (3,600) (660)
Temporarily Impaired [Member] | US Government Corporations and Agencies Securities [Member]
   
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 781  
Less than Twelve Months, Gross Unrealized Losses (28)  
Twelve Months or Longer, Fair Value 0 5,608
Twelve Months or Longer, Gross Unrealized Losses 0 (84)
Total, Fair Value 781 5,608
Total, Gross Unrealized Losses (28) (84)
Temporarily Impaired [Member] | Debt Securities [Member]
   
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 129,269 26,322
Less than Twelve Months, Gross Unrealized Losses (3,273) (278)
Twelve Months or Longer, Fair Value 8,459 16,240
Twelve Months or Longer, Gross Unrealized Losses (312) (377)
Total, Fair Value 137,728 42,562
Total, Gross Unrealized Losses (3,585) (655)
Temporarily Impaired [Member] | Taxable Securities [Member]
   
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 127,830 24,713
Less than Twelve Months, Gross Unrealized Losses (3,259) (269)
Twelve Months or Longer, Fair Value 7,455 15,168
Twelve Months or Longer, Gross Unrealized Losses (290) (339)
Total, Fair Value 135,285 39,881
Total, Gross Unrealized Losses (3,549) (608)
Temporarily Impaired [Member] | Agency Securities [Member]
   
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 117,986 15,593
Less than Twelve Months, Gross Unrealized Losses (3,079) (133)
Twelve Months or Longer, Fair Value 2,870 735
Twelve Months or Longer, Gross Unrealized Losses (118) (13)
Total, Fair Value 120,856 16,328
Total, Gross Unrealized Losses (3,197) (146)
Temporarily Impaired [Member] | Collateralized Mortgage Obligations [Member]
   
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 6,417 5,135
Less than Twelve Months, Gross Unrealized Losses (121) (121)
Twelve Months or Longer, Fair Value 2,666 4,994
Twelve Months or Longer, Gross Unrealized Losses (71) (97)
Total, Fair Value 9,083 10,129
Total, Gross Unrealized Losses (192) (218)
Temporarily Impaired [Member] | Residential Mortgage Backed Securities [Member]
   
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 921 592
Less than Twelve Months, Gross Unrealized Losses (19) (13)
Twelve Months or Longer, Fair Value 1,293 1,555
Twelve Months or Longer, Gross Unrealized Losses (77) (110)
Total, Fair Value 2,214 2,147
Total, Gross Unrealized Losses (96) (123)
Temporarily Impaired [Member] | Commercial Mortgage Backed Securities [Member]
   
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 274  
Less than Twelve Months, Gross Unrealized Losses (8)  
Total, Fair Value 274  
Total, Gross Unrealized Losses (8)  
Temporarily Impaired [Member] | Foreign Securities [Member]
   
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 0 1,715
Less than Twelve Months, Gross Unrealized Losses 0 (1)
Twelve Months or Longer, Fair Value 48 563
Twelve Months or Longer, Gross Unrealized Losses (12) (5)
Total, Fair Value 48 2,278
Total, Gross Unrealized Losses (12) (6)
Temporarily Impaired [Member] | Corporate Bond Securities [Member]
   
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 59 0
Less than Twelve Months, Gross Unrealized Losses (1) 0
Twelve Months or Longer, Fair Value 279 277
Twelve Months or Longer, Gross Unrealized Losses (9) (16)
Total, Fair Value 338 277
Total, Gross Unrealized Losses (10) (16)
Temporarily Impaired [Member] | Other Debt Obligations [Member]
   
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 1,392 1,678
Less than Twelve Months, Gross Unrealized Losses (3) (1)
Twelve Months or Longer, Fair Value 299 1,436
Twelve Months or Longer, Gross Unrealized Losses (3) (14)
Total, Fair Value 1,691 3,114
Total, Gross Unrealized Losses (6) (15)
Temporarily Impaired [Member] | Tax-exempt securities [Member]
   
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 1,439 1,609
Less than Twelve Months, Gross Unrealized Losses (14) (9)
Twelve Months or Longer, Fair Value 1,004 1,072
Twelve Months or Longer, Gross Unrealized Losses (22) (38)
Total, Fair Value 2,443 2,681
Total, Gross Unrealized Losses (36) (47)
Other Than Temporarily Impaired [Member] | Residential Mortgage Backed Securities [Member]
   
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 0 [3] 14 [3]
Less than Twelve Months, Gross Unrealized Losses 0 [3] (1) [3]
Twelve Months or Longer, Fair Value 2 [3] 74 [3]
Twelve Months or Longer, Gross Unrealized Losses (2) [3] (4) [3]
Total, Fair Value 2 [3] 88 [3]
Total, Gross Unrealized Losses $ (2) [3] $ (5) [3]
[1] At September 30, 2013, the amortized cost of approximately 4,900 AFS debt securities exceeded their fair value by $3.6 billion.
[2] At December 31, 2012, the amortized cost of approximately 2,600 AFS debt securities exceeded their fair value by $660 million.
[3] Includes other-than-temporarily impaired AFS debt securities on which an OTTI loss remains in accumulated OCI.