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Acquisition (Acquired Impaired Loan Portfolio at Fair Value) (Details) (Acquired Purchased Credit-Impaired Loans [Member], USD $)
In Millions, unless otherwise specified
Jul. 28, 2011
Acquired Purchased Credit-Impaired Loans [Member]
 
Contractually required principal and interest $ 328 [1]
Contractual cash flows not expected to be collected (nonaccretable difference) 176
Expected cash flows 152
Interest component of expected cash flows (accretable yield) 24
Fair value at acquisition $ 128
[1] Excludes loans fully charged off prior to acquisition date with no expectation of future cash flows