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Investments (Mortgage Loans and Valuation Allowance by Portfolio Segment) (Details) - USD ($)
$ in Millions
Mar. 31, 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 540 600
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 492 555
Financing Receivable, Collectively Evaluated for Impairment 78,152 75,209
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 347 339
Impaired Financing Receivable, Recorded Investment 520 583
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 93 169
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 92 169
Financing Receivable, Collectively Evaluated for Impairment 15,007 14,705
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 44 43
Impaired Financing Receivable, Recorded Investment 120 197
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 49,960 48,463
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 245 238
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 447 431
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 400 386
Financing Receivable, Collectively Evaluated for Impairment 13,185 12,041
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 58 58
Impaired Financing Receivable, Recorded Investment $ 400 $ 386