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Fair Values of Assets and Liabilities (Details Textual) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Fair Values of Assets and Liabilities (Textual) [Abstract]          
Fair value measurement transfers from one level to another     $ 0 $ 0  
Mortgage loans held for sale measured at fair value gain losses 241 (11) 260 (136)  
Net gains and losses on available for sale securities included in securities gains (losses) (13) (9) (22) (15)  
Net gains and losses on available for sale securities included in interest income 14 15 28 31  
Net change in net derivative assets and liabilities in unrealized gains (losses) included in mortgage banking revenue (491) (145) (849) (155)  
Net change in net derivative assets and liabilities in unrealized gains (losses) included in noninterest income 102 115 (1) (14)  
Net gains and losses on net derivative assets and liabilities included in mortgage banking revenue 634 141 987 189  
Net gains and losses on net derivative assets and liabilities included in noninterest income 242 232 220 227  
Assumed minimum credit valuation adjustment as percentage of underlying fair value of underlying derivative contracts     0.00%    
Assumed maximum credit valuation adjustment as percentage of underlying fair value of underlying derivative contracts     370.00%    
Assumed average credit valuation adjustment as percentage of underlying fair value of underlying derivative contracts     7.00%    
Carrying value of unfunded commitments and standby letters of credit 401   401   381
Carrying value of other guarantees $ 425   $ 425   $ 359