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Fair Value Measurements (Details 6) (Level Three, USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Interest rate lock commitments, net
       
Activity in assets and liabilities, net classified within Level Three of the valuation hierarchy        
Balance, beginning of period $ (11) $ 179 $ 139 $ 184
Realized and unrealized gains (losses) 136 425 405 1,185
Settlements (63) (383) (482) (1,148)
Balance, end of period 62 221 62 221
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)
Mortgage loans held for sale
       
Activity in assets classified within Level Three of the valuation hierarchy        
Balance, beginning of period 55 12 64 17
Realized and unrealized gains (losses) 2 (1) (10) (2)
Purchases 12   68 2
Issuances 2 2 2 3
Settlements (12) (1) (68) (3)
Transfers into level Three 9   34  
Transfers out of level Three (9)   (31) (5)
Balance, end of period 59 12 59 12
Mortgage servicing rights
       
Activity in assets classified within Level Three of the valuation hierarchy        
Balance, beginning of period 1,247 1,157 1,022 1,209
Realized and unrealized gains (losses) (74) (225) 6 (451)
Issuances 64 70 209 244
Balance, end of period 1,237 1,002 1,237 1,002
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)