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Investments (Details 13) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]    
Mortgage Loans on Real Estate, Commercial and Consumer, Net $ 4,322 $ 4,486
Mortgage loans, non-impaired    
Financing Receivable, Impaired [Line Items]    
Fixed rate mortgage loans 4,268 4,442
Variable rate mortgage loans 39 39
Mortgage Loans on Real Estate, Commercial and Consumer, Net 4,307 4,481
Below 1.0 | Mortgage loans, non-impaired    
Financing Receivable, Impaired [Line Items]    
Fixed rate mortgage loans 4 60
Variable rate mortgage loans 0 0
Mortgage Loans on Real Estate, Commercial and Consumer, Net 4 60
1.0 - 1.25 | Mortgage loans, non-impaired    
Financing Receivable, Impaired [Line Items]    
Fixed rate mortgage loans 349 324
Variable rate mortgage loans 0 0
Mortgage Loans on Real Estate, Commercial and Consumer, Net 349 324
1.26 - 1.50 | Mortgage loans, non-impaired    
Financing Receivable, Impaired [Line Items]    
Fixed rate mortgage loans 1,111 1,293
Variable rate mortgage loans 0 0
Mortgage Loans on Real Estate, Commercial and Consumer, Net 1,111 1,293
Above 1.50 | Mortgage loans, non-impaired    
Financing Receivable, Impaired [Line Items]    
Fixed rate mortgage loans 2,804 2,765
Variable rate mortgage loans 39 39
Mortgage Loans on Real Estate, Commercial and Consumer, Net $ 2,843 $ 2,804