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Investments (Mortgage Loans and Valuation Allowance by Portfolio Segment) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance $ 13 $ 22
Impaired Financing Receivable, with Related Allowance, Recorded Investment 13 21
Impaired Financing Receivable, Related Allowance 2 2
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 531 385
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 487 351
Financing Receivable, Collectively Evaluated for Impairment 71,974 68,153
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 334 312
Impaired Financing Receivable, Recorded Investment 498 370
Commercial 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 0 0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 0 0
Financing Receivable, Collectively Evaluated for Impairment 47,460 44,375
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 232 214
Impaired Financing Receivable, Recorded Investment 0 0
Agricultural Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 13 22
Impaired Financing Receivable, with Related Allowance, Recorded Investment 13 21
Impaired Financing Receivable, Related Allowance 2 2
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 111 27
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 110 27
Financing Receivable, Collectively Evaluated for Impairment 13,554 12,966
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 40 39
Impaired Financing Receivable, Recorded Investment 121 46
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 420 358
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 377 324
Financing Receivable, Collectively Evaluated for Impairment 10,960 10,812
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 62 59
Impaired Financing Receivable, Recorded Investment $ 377 $ 324