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Financing Receivables (Summary of Financing Receivables) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Loans $ 19,547 [1] $ 15,255 [1]
Allowance 77 17
Commercial And Industrial [Member]
   
Loans 7,457 5,083
Consumer Loan [Member]
   
Loans 6,200 5,170
Residential Real Estate [Member]
   
Loans 5,489 4,674
Wholesale Real Estate [Member]
   
Loans $ 401 $ 328
[1] Amounts are net of allowances of $77 million and $17 million at June 30, 2012 and December 31, 2011, respectively.