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Financial Instruments - Derivatives Not Designated as Hedging, Fair Value Table (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]    
Derivative contracts at fair value $ 479 $ 639
Derivative Asset 796 785
Investment Segment    
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]    
Collateral for derivative positions 1,541 872
Investment Segment | Not designated as hedging instrument | Other assets [Member]    
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]    
Netting across contract types [1] (363) (231)
Derivative contracts, at fair value [1] 793 785
Derivative Asset 1,156 1,016
Investment Segment | Not designated as hedging instrument | Other assets [Member] | Equity contracts    
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]    
Derivative Asset 30 4
Investment Segment | Not designated as hedging instrument | Other assets [Member] | Credit contracts    
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]    
Derivative Asset 1,126 1,012
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 839 853
Netting across contract types [1] (363) (231)
Derivative contracts at fair value [1] 476 622
Investment Segment | Not designated as hedging instrument | Accrued expenses and other liabilities | Equity contracts    
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]    
Liability Derivatives, Gross $ 839 852
Investment Segment | Not designated as hedging instrument | Accrued expenses and other liabilities | Credit contracts    
Derivatives Not Designated as Hedging Instruments, Fair Value [Line Items]    
Liability Derivatives, Gross   $ 1
[1] Excludes netting of cash collateral received and posted. The total collateral posted at September 30, 2021 and December 31, 2020 was $1,541 million and $872 million, respectively, across all counterparties, which are included in cash held at consolidated affiliated partnerships and restricted cash in the condensed consolidated balance sheets.