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Goodwill and Other Intangible Assets (Identifiable Intangible Assets) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Gross carrying amount $ 1,413 $ 1,413
Accumulated amortization (991) (969)
Net carrying amount 422 444
Core Deposit Intangibles [Member]
   
Gross carrying amount 626 626
Accumulated amortization (493) (484)
Net carrying amount 133 142
Other Identifiable Intangible Assets [Member]
   
Gross carrying amount 787 [1] 787 [1]
Accumulated amortization (498) [1] (485) [1]
Net carrying amount $ 289 [1] $ 302 [1]
[1] Other identifiable intangibles are primarily customer relationship intangibles.