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Financing Receivables (Summary of Financing Receivables) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Loans $ 23,917 [1] $ 15,255 [1]
Allowance 106 17
Commercial and Industrial
   
Loans 9,352 5,083
Consumer Loans
   
Loans 7,615 5,170
Residential Real Estate Loans
   
Loans 6,625 4,674
Wholesale Real Estate Loans
   
Loans $ 325 $ 328
[1] Amounts are net of allowances of $106 million and $17 million at December 31, 2012 and December 31, 2011, respectively. The increase for the year ended December 31, 2012 was primarily driven by enhancements to the estimates for the inherent losses for and growth in the Company’s loans held for investment portfolio.