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Financing Receivables (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 3 Months Ended
Mar. 31, 2012
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2013
Commercial Mortgage Loans
Dec. 31, 2012
Commercial Mortgage Loans
Mar. 31, 2012
Commercial Mortgage Loans
Dec. 31, 2011
Commercial Mortgage Loans
Mar. 31, 2013
Residential Mortgage Loans
Dec. 31, 2012
Residential Mortgage Loans
Mar. 31, 2013
Syndicated Loans
Mar. 31, 2012
Syndicated Loans
Dec. 31, 2012
Syndicated Loans
Rollforward of the allowance for loan losses                        
Beginning balance $ 37 $ 30 $ 30 $ 26 $ 26 $ 32 $ 32     $ 4 $ 5  
Charge-offs (1)                   (1)  
Ending balance 36 30 30 26 26 32 32     4 4  
Individually evaluated for impairment 9 5   5   9            
Collectively evaluated for impairment 27 25   21   23       4 4  
Recorded investment in financing receivables by impairment method and type of loan                        
Individually evaluated for impairment   48 39 46 39         2    
Collectively evaluated for impairment   3,637 3,679 2,455 2,442     890 934 292   303
Total   3,685 3,718 2,501 2,481     890 934 294   303
Recorded investment in financing receivables individually evaluated for impairment with no related allowance for loan losses   12 10                  
Unamortized discount               72 80      
Total loans purchased                   22 29  
Loans sold                   1    
Nonperforming loans   $ 10 $ 4