Investments - Summary of Derivative Instruments Held (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Designated as Hedging Instrument | Fair Value Hedging | Foreign currency swap contracts
Derivative [Line Items]
Notional Value	$ 1,073	$ 1,081
Designated as Hedging Instrument | Fair Value Hedging | Interest rate swap contracts
Derivative [Line Items]
Notional Value	1,500	750
Designated as Hedging Instrument | Net Investment Hedging | Foreign currency swap contracts
Derivative [Line Items]
Notional Value	526	526
Designated as Hedging Instrument | Net Investment Hedging | Foreign currency forward contracts (1)
Derivative [Line Items]
Notional Value	720	1,380
Not Designated as Hedging Instrument, Economic Hedge | Foreign currency forward contracts (1)
Derivative [Line Items]
Notional Value	$ 730	$ 720