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Fair Values of Assets and Liabilities (Details Textual) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Fair Values of Assets and Liabilities (Textual) [Abstract]      
Fair value measurement transfers from one level to another $ 0 $ 0 $ 0
Mortgage loans held for sale measured at fair value gain losses 15,000,000 (125,000,000) 206,000,000
Mortgage loans held for sale 6,900,000,000    
Fair value of mortgage loans held for sale exceeded the unpaid principal 290,000,000    
Carrying value of unfunded commitments and standby letters of credit 381,000,000 353,000,000  
Carrying value of other guarantees 359,000,000 330,000,000  
Net gains and losses on available for sale securities included in securities gains (losses) (31,000,000) (91,000,000) (361,000,000)
Net gains and losses on available for sale securities included in interest income 56,000,000 61,000,000 31,000,000
Net gains and losses on net derivative assets and liabilities included in noninterest income 716,000,000 632,000,000 (1,400,000,000)
Net gains and losses on net derivative assets and liabilities included in mortgage banking revenue 834,000,000 795,000,000 611,000,000
Net change in net derivative assets and liabilities in unrealized gains (losses) included in noninterest income 262,000,000 483,000,000 (630,000,000)
Net change in net derivative assets and liabilities in unrealized gains (losses) included in mortgage banking revenue $ (645,000,000) $ (801,000,000) $ (698,000,000)