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Investment Holding Level 4 Net Realized Capital Gains and Sale of AFS (Details) - USD ($)
$ in Millions
5 Months Ended 7 Months Ended 12 Months Ended
May 31, 2018
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Gain (Loss) on Securities [Line Items]        
Proceeds from Sale of Debt Securities, Available-for-sale $ 4,397 $ 3,303 $ 2,824 $ 3,498
Available-for-sale Securities, Gross Realized Gains 49 12 166 67
Available-for-sale Securities, Gross Realized Losses (112) (38) (32) (18)
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net 0 (6)   (4)
Foreign Currency Transaction Gain (Loss), before Tax (6) 9 3 (4)
Realized Investment Gains (Losses) (107) 142 (74) (275)
Other net realized capital gains (losses)   142    
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease)     (1)  
Debt Securities, Available-for-sale, Allowance for Credit Loss, Sell before Recovery   (1) (6)  
Commercial Loan [Member]        
Gain (Loss) on Securities [Line Items]        
Interest Receivable     7 8
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) 0 (5) (8) 5
Debt Securities [Member]        
Gain (Loss) on Securities [Line Items]        
Proceeds from Sale of Debt Securities, Available-for-sale 3,523 2,523 1,789 2,541
Available-for-sale Securities, Gross Realized Gains 45 12 165 67
Available-for-sale Securities, Gross Realized Losses (47) (37) (31) (16)
Interest Receivable     114 122
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]        
Gain (Loss) on Securities [Line Items]        
Other net realized capital gains (losses) (2) (32) 127 47
Not Designated as Hedging Instrument [Member]        
Gain (Loss) on Securities [Line Items]        
Derivative, Gain (Loss) on Derivative, Net (27) 187 (187) (315)
Not Designated as Hedging Instrument [Member] | Other Credit Derivatives [Member]        
Gain (Loss) on Securities [Line Items]        
Derivative, Gain (Loss) on Derivative, Net (10) 35 149 54
Variable Annuity [Member]        
Gain (Loss) on Securities [Line Items]        
Derivative, Gain (Loss) on Derivative, Net (24) 165 (332) (365)
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member]        
Gain (Loss) on Securities [Line Items]        
Derivative, Gain (Loss) on Derivative, Net 7 (10) (7) (4)
Macro Hedge Program [Member]        
Gain (Loss) on Securities [Line Items]        
Derivative, Gain (Loss) on Derivative, Net (36) 153 (414) (418)
GMWB Derivatives, Net [Member]        
Gain (Loss) on Securities [Line Items]        
Derivative, Gain (Loss) on Derivative, Net 12 12 82 53
Other Investments [Member]        
Gain (Loss) on Securities [Line Items]        
Gain (Loss) on Disposition of Other Financial Assets (23) 37 142 51
Equity Securities [Member]        
Gain (Loss) on Securities [Line Items]        
Net Realized and Unrealized Gain (Loss) on Trading Securities (3) (14) 4 (2)
Marketable Securities, Realized Gain (Loss) 2 (21) 1 2
Mortgage loans [1]        
Gain (Loss) on Securities [Line Items]        
SEC Schedule, 12-09, Valuation Allowances and Reserves, Increase (Decrease) Adjustment $ 0 $ 5   $ 0
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)     $ (8)