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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, 2019
Dec. 31, 2017
Gain (Loss) on Securities [Line Items]        
Available-for-sale Securities, Gross Realized Gains $ 49 $ 12 $ 67 $ 226
Available-for-sale Securities, Gross Realized Losses (112) (38) (18) (58)
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net 0 (7) (4) (14)
Foreign Currency Transaction Gain (Loss), before Tax (6) 9 (4) (1)
Realized Investment Gains (Losses) (107) 142 (275) (60)
Other net realized capital gains (losses) (107) 149 (271) (46)
Proceeds from Sale of Debt Securities, Available-for-sale 4,397 3,303 3,498 10,315
Equity Securities [Member]        
Gain (Loss) on Securities [Line Items]        
Available-for-sale Securities, Gross Realized Gains       13
Available-for-sale Securities, Gross Realized Losses       (1)
Proceeds from Sale of Debt Securities, Available-for-sale       203
Debt Securities [Member]        
Gain (Loss) on Securities [Line Items]        
Available-for-sale Securities, Gross Realized Gains 45 12 67 211
Available-for-sale Securities, Gross Realized Losses (47) (37) (16) (56)
Proceeds from Sale of Debt Securities, Available-for-sale 3,523 2,523 2,541 7,979
Not Designated as Hedging Instrument [Member]        
Gain (Loss) on Securities [Line Items]        
Derivative, Gain (Loss) on Derivative, Net (27) 187 (315) (217)
Not Designated as Hedging Instrument [Member] | Other Credit Derivatives [Member]        
Gain (Loss) on Securities [Line Items]        
Derivative, Gain (Loss) on Derivative, Net (10) 35 54 0
Variable Annuity [Member]        
Gain (Loss) on Securities [Line Items]        
Derivative, Gain (Loss) on Derivative, Net (24) 165 (365) (212)
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member]        
Gain (Loss) on Securities [Line Items]        
Derivative, Gain (Loss) on Derivative, Net 7 (10) (4) (5)
Other Investments [Member]        
Gain (Loss) on Securities [Line Items]        
Gain (Loss) on Disposition of Other Financial Assets (23) 37 51 2
Equity Securities [Member]        
Gain (Loss) on Securities [Line Items]        
Marketable Securities, Realized Gain (Loss) 2 (21) 2 0
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net 0 0 0 0
Net Realized and Unrealized Gain (Loss) on Trading Securities (3) (14) (2)  
Mortgages [Member]        
Gain (Loss) on Securities [Line Items]        
SEC Schedule, 12-09, Valuation Allowances and Reserves, Increase (Decrease) Adjustment 0 5 0 (2)
GMWB Derivatives, Net [Member]        
Gain (Loss) on Securities [Line Items]        
Derivative, Gain (Loss) on Derivative, Net 12 12 53 48
Macro Hedge Program [Member]        
Gain (Loss) on Securities [Line Items]        
Derivative, Gain (Loss) on Derivative, Net $ (36) $ 153 $ (418) $ (260)