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Investments (Mortgage Loans and Valuation Allowance by Portfolio Segment) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance $ 56 $ 31  
Impaired Financing Receivable, with Related Allowance, Recorded Investment 56 31  
Impaired Financing Receivable, Related Allowance 3 3  
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 674 600  
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 628 555  
Financing Receivable, Collectively Evaluated for Impairment 79,951 75,209  
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 350 339  
Impaired Financing Receivable, Recorded Investment 681 583  
Impaired Financing Receivable, Average Recorded Investment 607 481  
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 49,624 48,463  
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 246 238  
Impaired Financing Receivable, Recorded Investment 0 0  
Impaired Financing Receivable, Average Recorded Investment 0 0 $ 5
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 473 431  
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 427 386  
Financing Receivable, Collectively Evaluated for Impairment 13,889 12,041  
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 55 58  
Impaired Financing Receivable, Recorded Investment 427 386  
Impaired Financing Receivable, Average Recorded Investment 406 358 285
Agricultural Mortgage Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 56 31  
Impaired Financing Receivable, with Related Allowance, Recorded Investment 56 31  
Impaired Financing Receivable, Related Allowance 3 3  
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 201 169  
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 201 169  
Financing Receivable, Collectively Evaluated for Impairment 16,438 14,705  
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 49 43  
Impaired Financing Receivable, Recorded Investment 254 197  
Impaired Financing Receivable, Average Recorded Investment $ 201 $ 123 $ 32