v2.4.0.8
Guarantees, Pledged Assets and Collateral (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Guarantees [Abstract]    
Carrying value $ 1,326 $ 1,606
Maximum exposure to loss, expires in one year or less 20,978 23,548
Maximum exposure to loss, expires in one year through three years 17,026 16,069
Maximum exposure to loss, expires in three years through five years 7,643 9,768
Maximum exposure to loss, expires after five years 14,124 12,215
Maximum exposure to loss 59,771 61,600
Pledged Assets    
Trading assets and other 35,397 28,031
Securities available for sale 96,293 96,018
Loans 384,152 360,171
Total pledged assets 515,842 484,220
Non-investment grade [Member]
    
Guarantees [Abstract]    
Maximum exposure to loss 17,540 19,443
Standby Letters of Credit [Member]
    
Guarantees [Abstract]    
Carrying value 56 42
Maximum exposure to loss, expires in one year or less 16,214 19,463
Maximum exposure to loss, expires in one year through three years 12,240 11,782
Maximum exposure to loss, expires in three years through five years 4,385 6,531
Maximum exposure to loss, expires after five years 2,641 1,983
Maximum exposure to loss 35,480 39,759
Standby Letters of Credit [Member] | Non-investment grade [Member]
    
Guarantees [Abstract]    
Maximum exposure to loss 8,912 11,331
Securities lending and other indemnifications [Member]
    
Guarantees [Abstract]    
Carrying value 0 0
Maximum exposure to loss, expires in one year or less 0 3
Maximum exposure to loss, expires in one year through three years 23 7
Maximum exposure to loss, expires in three years through five years 24 20
Maximum exposure to loss, expires after five years 3,197 2,511
Maximum exposure to loss 3,244 2,541
Securities lending and other indemnifications [Member] | Non-investment grade [Member]
    
Guarantees [Abstract]    
Maximum exposure to loss 54 118
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 26 3
Maximum exposure to loss 26 3
Liquidity agreements [Member] | Non-investment grade [Member]
    
Guarantees [Abstract]    
Maximum exposure to loss 4 3
Written put options [Member]
    
Guarantees [Abstract]    
Carrying value 1,146 1,427
Maximum exposure to loss, expires in one year or less 4,231 2,951
Maximum exposure to loss, expires in one year through three years 4,219 3,873
Maximum exposure to loss, expires in three years through five years 2,417 2,475
Maximum exposure to loss, expires after five years 2,513 2,575
Maximum exposure to loss 13,380 11,874
Written put options [Member] | Non-investment grade [Member]
    
Guarantees [Abstract]    
Maximum exposure to loss 4,920 3,953
Loans and MHFS sold with recourse [Member]
    
Guarantees [Abstract]    
Carrying value 89 99
Maximum exposure to loss, expires in one year or less 167 443
Maximum exposure to loss, expires in one year through three years 437 357
Maximum exposure to loss, expires in three years through five years 766 647
Maximum exposure to loss, expires after five years 4,759 4,426
Maximum exposure to loss 6,129 5,873
Loans and MHFS sold with recourse [Member] | Non-investment grade [Member]
    
Guarantees [Abstract]    
Maximum exposure to loss 3,529 3,905
Contingent consideration [Member]
    
Guarantees [Abstract]    
Carrying value 32 35
Maximum exposure to loss, expires in one year or less 11 11
Maximum exposure to loss, expires in one year through three years 74 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 118 129
Other guarantees [Member]
    
Guarantees [Abstract]    
Carrying value 3 3
Maximum exposure to loss, expires in one year or less 355 677
Maximum exposure to loss, expires in one year through three years 33 26
Maximum exposure to loss, expires in three years through five years 17 1
Maximum exposure to loss, expires after five years 988 717
Maximum exposure to loss 1,393 1,421
Other guarantees [Member] | Non-investment grade [Member]
    
Guarantees [Abstract]    
Maximum exposure to loss $ 3 $ 4