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Investments (Mortgage Loans and Valuation Allowance by Portfolio Segment) (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance $ 31 $ 31
Impaired Financing Receivable, with Related Allowance, Recorded Investment 31 31
Impaired Financing Receivable, Related Allowance 3 3
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 695 600
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 593 555
Financing Receivable, Collectively Evaluated for Impairment 77,468 75,209
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 354 339
Impaired Financing Receivable, Recorded Investment 621 583
Agricultural Mortgage Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 31 31
Impaired Financing Receivable, with Related Allowance, Recorded Investment 31 31
Impaired Financing Receivable, Related Allowance 3 3
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 191 169
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 190 169
Financing Receivable, Collectively Evaluated for Impairment 15,113 14,705
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 45 43
Impaired Financing Receivable, Recorded Investment 218 197
Commercial Mortgage Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 0 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment 0 0
Impaired Financing Receivable, Related Allowance 0 0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 0 0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 0 0
Financing Receivable, Collectively Evaluated for Impairment 49,570 48,463
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 246 238
Impaired Financing Receivable, Recorded Investment 0 0
Residential Mortgage Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 0 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment 0 0
Impaired Financing Receivable, Related Allowance 0 0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 504 431
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 403 386
Financing Receivable, Collectively Evaluated for Impairment 12,785 12,041
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 63 58
Impaired Financing Receivable, Recorded Investment $ 403 $ 386