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Fair Value Measurements (Details 6) (Level Three, USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Mortgage loans held for sale
       
Activity in assets classified within Level Three of the valuation hierarchy        
Balance, beginning of period $ 56 $ 13 $ 64 $ 17
Realized and unrealized gains (losses) (6) (1) (12) (1)
Purchases 31 1 56 2
Issuances   1   1
Settlements (26) (1) (56) (2)
Transfers into level Three 11   25  
Transfers out of level Three (11) (1) (22) (5)
Balance, end of period 55 12 55 12
Mortgage servicing rights
       
Activity in assets classified within Level Three of the valuation hierarchy        
Balance, beginning of period 1,101 1,296 1,022 1,209
Realized and unrealized gains (losses) 75 (205) 80 (226)
Issuances 71 66 145 174
Balance, end of period 1,247 1,157 1,247 1,157
Interest rate lock commitments, net
       
Activity in assets and liabilities, net classified within Level Three of the valuation hierarchy        
Balance, beginning of period 113 128 139 184
Realized and unrealized gains (losses) 67 374 269 760
Settlements (191) (323) (419) (765)
Balance, end of period (11) 179 (11) 179
Investment securities
       
Activity in assets classified within Level Three of the valuation hierarchy        
Realized and unrealized gains (losses)       (2)
Settlements       (5)
Deconsolidation of entity       7
Securitized mortgage loans
       
Activity in assets classified within Level Three of the valuation hierarchy        
Balance, beginning of period       28
Deconsolidation of entity       (28)
Mortgage loan Securitization debt certificates
       
Activity in liabilities classified within Level Three of the valuation hierarchy        
Balance, beginning of period       21
Deconsolidation of entity       $ (21)