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Investments (Mortgage Loans and Valuation Allowance by Portfolio Segment) (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance $ 13 $ 31
Impaired Financing Receivable, with Related Allowance, Recorded Investment 13 31
Impaired Financing Receivable, Related Allowance 1 3
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 712 600
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 608 555
Financing Receivable, Collectively Evaluated for Impairment 78,470 75,209
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 349 339
Impaired Financing Receivable, Recorded Investment 620 583
Agricultural Mortgage Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 13 31
Impaired Financing Receivable, with Related Allowance, Recorded Investment 13 31
Impaired Financing Receivable, Related Allowance 1 3
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 195 169
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 194 169
Financing Receivable, Collectively Evaluated for Impairment 15,545 14,705
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 47 43
Impaired Financing Receivable, Recorded Investment 206 197
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 49,898 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 517 431
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 414 386
Financing Receivable, Collectively Evaluated for Impairment 13,027 12,041
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 57 58
Impaired Financing Receivable, Recorded Investment $ 414 $ 386