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Investments (Credit Quality of Agricultural and Residential Mortgage Loans) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Consumer, Mortgage $ 11,337 $ 11,136
Loans And Leases Receivable Consumer Mortgage Percentage 100.00% 100.00%
Loans Receivable, Gross, Commercial, Agricultural $ 13,677 $ 13,014
Loans Receivable Commercial Agricultural Mortgage Percentage 100.00% 100.00%
Performing Financial Instruments [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Consumer, Mortgage $ 10,873 $ 10,622
Loans And Leases Receivable Consumer Mortgage Percentage 95.90% 95.40%
Mortgage Loans By Credit Quality Indicator Range Two [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, Gross, Commercial, Agricultural $ 851 $ 618
Loans Receivable Commercial Agricultural Mortgage Percentage 6.20% 4.70%
Mortgage Loans By Credit Quality Indicator Range Three [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, Gross, Commercial, Agricultural $ 32 $ 40
Loans Receivable Commercial Agricultural Mortgage Percentage 0.20% 0.30%
Mortgage Loans By Credit Quality Indicator Range Four [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, Gross, Commercial, Agricultural $ 5 $ 9
Loans Receivable Commercial Agricultural Mortgage Percentage 0.10% 0.10%
Nonperforming Financial Instruments [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Consumer, Mortgage $ 464 $ 514
Loans And Leases Receivable Consumer Mortgage Percentage 4.10% 4.60%
Mortgage Loans By Credit Quality Indicator Range One [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, Gross, Commercial, Agricultural $ 12,789 $ 12,347
Loans Receivable Commercial Agricultural Mortgage Percentage 93.50% 94.90%