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Financial Instruments Derivatives Not Designated as Hedging, Fair Value Table (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]    
Unrealized Gain On Derivative Contracts $ 785 $ 182
Derivative contracts, at fair value (liability) 639 1,224
Investment Segment    
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]    
Collateral for derivative positions 872 903
Investment Segment | Not designated as hedging instrument | Other assets [Member]    
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]    
Asset derivatives, Gross 1,016 291
Derivative, Fair Value, Amount Offset Against Collateral, Net [1] (231) (109)
Unrealized Gain On Derivative Contracts [1] 785 182
Investment Segment | Not designated as hedging instrument | Accrued expenses and other liabilities    
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]    
Liability derivatives, Gross 853 1,324
Derivative, Fair Value, Amount Offset Against Collateral, Net [1] (231) (109)
Derivative contracts, at fair value (liability) [1] 622 1,215
Investment Segment | Not designated as hedging instrument | Equity Contract [Member] | Other assets [Member]    
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]    
Asset derivatives, Gross 4 291
Investment Segment | Not designated as hedging instrument | Equity Contract [Member] | Accrued expenses and other liabilities    
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]    
Liability derivatives, Gross 852 1,058
Investment Segment | Not designated as hedging instrument | Credit Risk Contract [Member] | Other assets [Member]    
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]    
Asset derivatives, Gross 1,012  
Investment Segment | Not designated as hedging instrument | Credit Risk Contract [Member] | Accrued expenses and other liabilities    
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]    
Liability derivatives, Gross $ 1 $ 266
[1] Excludes netting of cash collateral received and posted. The total collateral posted at December 31, 2020 and 2019 was $872 million and $903 million, respectively, across all counterparties, which are included in cash held at consolidated affiliated partnerships and restricted cash in the consolidated balance sheets.