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Discontinued Operations - Assets and Liabilities of Discontinued Operations Were Considered Held for Sale (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Other assets   $ 440
Credit Card Receivables [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net    21,185
Other assets    269
Assets of discontinued operations    21,454
Deposits in domestic offices - noninterest bearing    35
Other liabilities    876
Liabilities of discontinued operations    $ 911