v2.4.0.6
Loans and Allowance for Credit Losses, PCI, Allowance for Credit Losses (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Changes in allowance for PCI loan losses [Abstract]        
Balance, beginning of period $ 231 $ 298 $ 333 $ 0
Provision for losses due to credit deterioration 32 160 771 853
Charge-offs (146) (227) (806) (520)
Balance, end of period 117 231 298 333
Commercial Portfolio Segment [Member]
       
Changes in allowance for PCI loan losses [Abstract]        
Balance, beginning of period 165 266 330 0
Provision for losses due to credit deterioration 25 106 712 850
Charge-offs (102) (207) (776) (520)
Balance, end of period 88 165 266 330
Pick-a-pay with payment option feature [Member]
       
Changes in allowance for PCI loan losses [Abstract]        
Balance, beginning of period 0 0 0 0
Provision for losses due to credit deterioration 0 0 0 0
Charge-offs 0 0 0 0
Balance, end of period 0 0 0 0
Other Consumer [Member]
       
Changes in allowance for PCI loan losses [Abstract]        
Balance, beginning of period 66 32 3 0
Provision for losses due to credit deterioration 7 54 59 3
Charge-offs (44) (20) (30) 0
Balance, end of period $ 29 $ 66 $ 32 $ 3