v2.4.0.6
Guarantees, Pledged Assets and Collateral (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Guarantees [Abstract]    
Carrying value $ 1,606 $ 1,701
Maximum exposure to loss 61,600 56,697
Pledged Assets and Collateral    
Pledged assets without the right to sell or repledge 456,189 398,282
Available for sale Securities [Member]
   
Pledged Assets and Collateral    
Pledged assets without the right to sell or repledge 96,018 80,540
Loans and Finance Receivables [Member]
   
Pledged Assets and Collateral    
Pledged assets without the right to sell or repledge 360,171 317,742
Non-investment grade [Member]
   
Guarantees [Abstract]    
Maximum exposure to loss 19,443 19,731
Standby Letters of Credit [Member]
   
Guarantees [Abstract]    
Carrying value 42 85
Maximum exposure to loss 39,759 41,171
Standby Letters of Credit [Member] | Non-investment grade [Member]
   
Guarantees [Abstract]    
Maximum exposure to loss 11,331 13,250
Securities lending and other indemnifications [Member]
   
Guarantees [Abstract]    
Carrying value 0 0
Maximum exposure to loss 2,541 669
Securities lending and other indemnifications [Member] | Non-investment grade [Member]
   
Guarantees [Abstract]    
Maximum exposure to loss 118 62
Liquidity agreements [Member]
   
Guarantees [Abstract]    
Carrying value 0 0
Maximum exposure to loss 3 2
Liquidity agreements [Member] | Non-investment grade [Member]
   
Guarantees [Abstract]    
Maximum exposure to loss 3 2
Written put options [Member]
   
Guarantees [Abstract]    
Carrying value 1,427 1,469
Maximum exposure to loss 11,874 8,224
Written put options [Member] | Non-investment grade [Member]
   
Guarantees [Abstract]    
Maximum exposure to loss 3,953 2,466
Loans and MHFS sold with recourse [Member]
   
Guarantees [Abstract]    
Carrying value 99 102
Maximum exposure to loss 5,873 5,784
Loans and MHFS sold with recourse [Member] | Non-investment grade [Member]
   
Guarantees [Abstract]    
Maximum exposure to loss 3,905 3,850
Residual value guarantees [Member]
   
Guarantees [Abstract]    
Carrying value 0 8
Maximum exposure to loss 0 197
Residual value guarantees [Member] | Non-investment grade [Member]
   
Guarantees [Abstract]    
Maximum exposure to loss 0 0
Contingent consideration [Member]
   
Guarantees [Abstract]    
Carrying value 35 31
Maximum exposure to loss 129 98
Contingent consideration [Member] | Non-investment grade [Member]
   
Guarantees [Abstract]    
Maximum exposure to loss 129 97
Other guarantees [Member]
   
Guarantees [Abstract]    
Carrying value 3 6
Maximum exposure to loss 1,421 552
Other guarantees [Member] | Non-investment grade [Member]
   
Guarantees [Abstract]    
Maximum exposure to loss $ 4 $ 4