v2.4.0.6
Mortgage Banking Activities, Amortized Mortgage Servicing Rights (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Changes in amortized MSRs      
Amortization $ (264) $ (228) $ (264)
Valuation Allowance      
Provision for mortgage servicing rights in excess of fair value (34) (3) 0
Amortized mortgage servicing rights, net 1,408 1,419  
Amortized [Member]
     
Changes in amortized MSRs      
Balance, beginning of year 1,422 1,119 1,446
Adjustments from adoption of consolidation accounting guidance 0 (5) 0
Purchases 155 58 11
Servicing from securitizations or asset transfers 132 478 61
Amortization (264) (228) (264)
Balance, end of year 1,445 1,422 1,119
Valuation Allowance      
Balance, beginning of year (3) 0 0
Provision for mortgage servicing rights in excess of fair value (34) (3) 0
Balance, end of year (37) (3) 0
Amortized mortgage servicing rights, net 1,408 1,419 1,119
Fair value of amortized MSRs:      
Beginning of year 1,812 1,261 1,555
End of year 1,756 1,812 1,261
Acquired From Wachovia [Member]
     
Changes in amortized MSRs      
Purchases $ 0 $ 0 $ (135)