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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
Sep. 30, 2022
Dec. 31, 2021
Interest rate swaps    
Gross Estimated Fair Values of Derivative Positions [Abstract]    
Contractual/notional amount $ 240 $ 100
Asset, estimated fair value 19
Liability, estimated fair value
Embedded derivative on funds withheld liability    
Gross Estimated Fair Values of Derivative Positions [Abstract]    
Contractual/notional amount 220 270
Asset, estimated fair value 1
Liability, estimated fair value (12)
Other    
Gross Estimated Fair Values of Derivative Positions [Abstract]    
Contractual/notional amount 127
Asset, estimated fair value 7
Liability, estimated fair value