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Investments (Credit Quality of Mortgage Loans) (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment $ 15,050 $ 13,652
Mortgage Loans | Performing    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment as a % of Total 99.00% 99.00%
Mortgage Loans | Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment $ 9,239 $ 8,502
Recorded Investment as a % of Total 100.00% 100.00%
Estimated Fair Value of Recorded Investment $ 9,650 $ 8,584
Estimated Fair Value of Recorded Investment as a % of Total 100.00% 100.00%
Mortgage Loans | Commercial | Debt Service Coverage Ratio, Greater than 1.20x    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment $ 8,997 $ 8,347
Mortgage Loans | Commercial | Debt Service Coverage Ratio, 1.00x to 1.20x    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment 120 89
Mortgage Loans | Commercial | Debt Service Coverage Ratio, Less than 1.00x    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment 122 66
Mortgage Loans | Commercial | Loan-to-Value Ratio, Less than 65%    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment $ 8,403 $ 7,567
Recorded Investment as a % of Total 91.00% 89.00%
Estimated Fair Value of Recorded Investment $ 8,790 $ 7,642
Estimated Fair Value of Recorded Investment as a % of Total 91.10% 89.00%
Mortgage Loans | Commercial | Loan-to-Value Ratio, Less than 65% | Debt Service Coverage Ratio, Greater than 1.20x    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment $ 8,170 $ 7,444
Mortgage Loans | Commercial | Loan-to-Value Ratio, Less than 65% | Debt Service Coverage Ratio, 1.00x to 1.20x    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment 120 89
Mortgage Loans | Commercial | Loan-to-Value Ratio, Less than 65% | Debt Service Coverage Ratio, Less than 1.00x    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment 113 34
Mortgage Loans | Commercial | Loan-to-Value Ratio, 65% to 75%    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment $ 688 $ 786
Recorded Investment as a % of Total 7.40% 9.20%
Estimated Fair Value of Recorded Investment $ 712 $ 797
Estimated Fair Value of Recorded Investment as a % of Total 7.40% 9.30%
Mortgage Loans | Commercial | Loan-to-Value Ratio, 65% to 75% | Debt Service Coverage Ratio, Greater than 1.20x    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment $ 688 $ 762
Mortgage Loans | Commercial | Loan-to-Value Ratio, 65% to 75% | Debt Service Coverage Ratio, 1.00x to 1.20x    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment 0 0
Mortgage Loans | Commercial | Loan-to-Value Ratio, 65% to 75% | Debt Service Coverage Ratio, Less than 1.00x    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment 0 24
Mortgage Loans | Commercial | Loan-to-Value Ratio, 76% to 80%    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment $ 148 $ 149
Recorded Investment as a % of Total 1.60% 1.80%
Estimated Fair Value of Recorded Investment $ 148 $ 145
Estimated Fair Value of Recorded Investment as a % of Total 1.50% 1.70%
Mortgage Loans | Commercial | Loan-to-Value Ratio, 76% to 80% | Debt Service Coverage Ratio, Greater than 1.20x    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment $ 139 $ 141
Mortgage Loans | Commercial | Loan-to-Value Ratio, 76% to 80% | Debt Service Coverage Ratio, 1.00x to 1.20x    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment 0 0
Mortgage Loans | Commercial | Loan-to-Value Ratio, 76% to 80% | Debt Service Coverage Ratio, Less than 1.00x    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment 9 8
Mortgage Loans | Agricultural    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment $ 3,184 $ 2,874
Recorded Investment as a % of Total 100.00% 100.00%
Estimated Fair Value of Recorded Investment $ 3,300 $ 2,900
Mortgage Loans | Agricultural | Loan-to-Value Ratio, Less than 65%    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment $ 2,833 $ 2,551
Recorded Investment as a % of Total 89.00% 88.80%
Mortgage Loans | Agricultural | Loan-to-Value Ratio, 65% to 75%    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment $ 350 $ 322
Recorded Investment as a % of Total 11.00% 11.20%
Mortgage Loans | Agricultural | Loan-to-Value Ratio, 76% to 80%    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment $ 1 $ 1
Recorded Investment as a % of Total 0.00% 0.00%
Mortgage Loans | Residential    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment $ 2,627 $ 2,276
Estimated Fair Value of Recorded Investment $ 2,700 $ 2,300
Recorded Investment as a % of Total 100.00% 100.00%
Mortgage Loans | Residential | Performing    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment $ 2,590 $ 2,240
Recorded Investment as a % of Total 98.60% 98.40%
Mortgage Loans | Residential | Nonperforming    
Financing Receivable, Recorded Investment [Line Items]    
Recorded Investment $ 37 $ 36
Recorded Investment as a % of Total 1.40% 1.60%