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Investments (Credit Quality of Agricultural and Residential Mortgage Loans) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, Gross, Commercial, Agricultural $ 14,905 $ 13,014
Loans Receivable Commercial Agricultural Mortgage Percentage 100.00% 100.00%
Loans and Leases Receivable, Gross, Consumer, Mortgage $ 12,427 $ 11,136
Loans And Leases Receivable Consumer Mortgage Percentage 100.00% 100.00%
Mortgage Loans in Process of Foreclosure, Amount $ 140 $ 133
Less than 65%    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, Gross, Commercial, Agricultural $ 13,704 $ 12,347
Loans Receivable Commercial Agricultural Mortgage Percentage 92.00% 94.90%
65% to 75%    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, Gross, Commercial, Agricultural $ 1,145 $ 618
Loans Receivable Commercial Agricultural Mortgage Percentage 7.70% 4.70%
76% to 80%    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, Gross, Commercial, Agricultural $ 33 $ 40
Loans Receivable Commercial Agricultural Mortgage Percentage 0.20% 0.30%
Greater than 80%    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, Gross, Commercial, Agricultural $ 23 $ 9
Loans Receivable Commercial Agricultural Mortgage Percentage 0.10% 0.10%
Performing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Consumer, Mortgage $ 11,956 $ 10,622
Loans And Leases Receivable Consumer Mortgage Percentage 96.20% 95.40%
Nonperforming (1)    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross, Consumer, Mortgage $ 471 $ 514
Loans And Leases Receivable Consumer Mortgage Percentage 3.80% 4.60%