v2.4.0.6
Guarantees, Pledged Assets and Collateral (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Guarantees [Abstract]    
Carrying value $ 1,209 $ 1,606
Maximum exposure to loss, expires in one year or less 21,619 23,548
Maximum exposure to loss, expires in one year through three years 15,763 16,069
Maximum exposure to loss, expires in three years through five years 8,319 9,768
Maximum exposure to loss, expires after five years 14,166 12,215
Maximum exposure to loss 59,867 61,600
Pledged Assets    
Trading assets and other 32,397 28,031
Securities available for sale 92,788 96,018
Loans 379,711 360,171
Total pledged assets 504,896 484,220
Non-investment grade [Member]
    
Guarantees [Abstract]    
Maximum exposure to loss 17,219 19,443
Standby Letters of Credit [Member]
    
Guarantees [Abstract]    
Carrying value 43 42
Maximum exposure to loss, expires in one year or less 17,231 19,463
Maximum exposure to loss, expires in one year through three years 11,455 11,782
Maximum exposure to loss, expires in three years through five years 5,161 6,531
Maximum exposure to loss, expires after five years 2,977 1,983
Maximum exposure to loss 36,824 39,759
Standby Letters of Credit [Member] | Non-investment grade [Member]
    
Guarantees [Abstract]    
Maximum exposure to loss 9,717 11,331
Securities lending and other indemnifications [Member]
    
Guarantees [Abstract]    
Carrying value 0 0
Maximum exposure to loss, expires in one year or less 2 3
Maximum exposure to loss, expires in one year through three years 17 7
Maximum exposure to loss, expires in three years through five years 11 20
Maximum exposure to loss, expires after five years 3,101 2,511
Maximum exposure to loss 3,131 2,541
Securities lending and other indemnifications [Member] | Non-investment grade [Member]
    
Guarantees [Abstract]    
Maximum exposure to loss 75 118
Liquidity agreements [Member]
    
Guarantees [Abstract]    
Carrying value 0 0
Maximum exposure to loss, expires in one year or less 0 0
Maximum exposure to loss, expires in one year through three years 0 0
Maximum exposure to loss, expires in three years through five years 0 0
Maximum exposure to loss, expires after five years 46 3
Maximum exposure to loss 46 3
Liquidity agreements [Member] | Non-investment grade [Member]
    
Guarantees [Abstract]    
Maximum exposure to loss 3 3
Written put options [Member]
    
Guarantees [Abstract]    
Carrying value 1,037 1,427
Maximum exposure to loss, expires in one year or less 3,462 2,951
Maximum exposure to loss, expires in one year through three years 3,844 3,873
Maximum exposure to loss, expires in three years through five years 2,324 2,475
Maximum exposure to loss, expires after five years 2,555 2,575
Maximum exposure to loss 12,185 11,874
Written put options [Member] | Non-investment grade [Member]
    
Guarantees [Abstract]    
Maximum exposure to loss 3,563 3,953
Loans and MHFS sold with recourse [Member]
    
Guarantees [Abstract]    
Carrying value 93 99
Maximum exposure to loss, expires in one year or less 226 443
Maximum exposure to loss, expires in one year through three years 350 357
Maximum exposure to loss, expires in three years through five years 788 647
Maximum exposure to loss, expires after five years 4,757 4,426
Maximum exposure to loss 6,121 5,873
Loans and MHFS sold with recourse [Member] | Non-investment grade [Member]
    
Guarantees [Abstract]    
Maximum exposure to loss 3,739 3,905
Contingent consideration [Member]
    
Guarantees [Abstract]    
Carrying value 33 35
Maximum exposure to loss, expires in one year or less 10 11
Maximum exposure to loss, expires in one year through three years 75 24
Maximum exposure to loss, expires in three years through five years 34 94
Maximum exposure to loss, expires after five years 0 0
Maximum exposure to loss 119 129
Contingent consideration [Member] | Non-investment grade [Member]
    
Guarantees [Abstract]    
Maximum exposure to loss 119 129
Other guarantees [Member]
    
Guarantees [Abstract]    
Carrying value 3 3
Maximum exposure to loss, expires in one year or less 688 677
Maximum exposure to loss, expires in one year through three years 22 26
Maximum exposure to loss, expires in three years through five years 1 1
Maximum exposure to loss, expires after five years 730 717
Maximum exposure to loss 1,441 1,421
Other guarantees [Member] | Non-investment grade [Member]
    
Guarantees [Abstract]    
Maximum exposure to loss $ 3 $ 4