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Investments - Aggregate Contractual or Notional Amounts and Estimated Fair Values Related to Derivative Financial Instruments (Details) - Without hedge designation - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Futures | Options – purchased    
Gross Estimated Fair Values of Derivative Positions [Abstract]    
Contractual/notional amount $ 216
Asset, estimated fair value 5
Liability, estimated fair value
Futures | Futures – short    
Gross Estimated Fair Values of Derivative Positions [Abstract]    
Contractual/notional amount 165 169
Asset, estimated fair value
Liability, estimated fair value (2)
Warrants    
Gross Estimated Fair Values of Derivative Positions [Abstract]    
Contractual/notional amount 95 117
Asset, estimated fair value 5 6
Liability, estimated fair value
Interest rate swaps    
Gross Estimated Fair Values of Derivative Positions [Abstract]    
Contractual/notional amount 240 240
Asset, estimated fair value 19 19
Liability, estimated fair value
Currency forwards    
Gross Estimated Fair Values of Derivative Positions [Abstract]    
Contractual/notional amount 13 12
Asset, estimated fair value
Liability, estimated fair value $ (1) $ (1)