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Investments (Mortgage Loans and Valuation Allowance by Portfolio Segment) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance $ 31 $ 22  
Impaired Financing Receivable, with Related Allowance, Recorded Investment 31 21  
Impaired Financing Receivable, Related Allowance 3 2  
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 600 385  
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 555 351  
Financing Receivable, Collectively Evaluated for Impairment 75,209 68,153  
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 339 312  
Impaired Financing Receivable, Recorded Investment 583 370  
Impaired Financing Receivable, Average Recorded Investment 481 322  
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 48,463 44,375  
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 238 214  
Impaired Financing Receivable, Recorded Investment 0 0  
Impaired Financing Receivable, Average Recorded Investment 0 5 $ 90
Agricultural Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 31 22  
Impaired Financing Receivable, with Related Allowance, Recorded Investment 31 21  
Impaired Financing Receivable, Related Allowance 3 2  
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 169 27  
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 169 27  
Financing Receivable, Collectively Evaluated for Impairment 14,705 12,966  
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 43 39  
Impaired Financing Receivable, Recorded Investment 197 46  
Impaired Financing Receivable, Average Recorded Investment 123 32 49
Residential Portfolio Segment [Member]      
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 431 358  
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 386 324  
Financing Receivable, Collectively Evaluated for Impairment 12,041 10,812  
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 58 59  
Impaired Financing Receivable, Recorded Investment 386 324  
Impaired Financing Receivable, Average Recorded Investment $ 358 $ 285 $ 188