Derivatives - Summary of Effect of Derivatives on Consolidated Statements of Operations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Derivatives Designated as Hedging Instrument [Member] | Cross Currency Contracts [Member] | Cash Flow Hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of income (expense) recognized in income	$ (1)	$ 6	$ (2)	$ 9
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Net Investment Income	Net Investment Income	Net Investment Income	Net Investment Income
Derivatives Designated as Hedging Instrument [Member] | Cross Currency Contracts [Member] | Net Investment Hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of income (expense) recognized in income	$ (1)	$ 1	$ 1	$ 1
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Interest Expense	Interest Expense	Interest Expense	Interest Expense
Derivatives Designated as Hedging Instrument [Member] | Cross Currency Contracts [Member] | Fair Value Hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of income (expense) recognized in income	$ (13)	$ 37	$ (22)	$ 43
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Net Investment Income	Net Investment Income	Net Investment Income	Net Investment Income
Derivatives Designated as Hedging Instrument [Member] | Cross Currency Contracts [Member] | Cash Flow Hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of income (expense) recognized in income	$ 1	$ 1	$ 2	$ 2
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Interest Expense	Interest Expense	Interest Expense	Interest Expense
Derivatives Designated as Hedging Instrument [Member] | Cross Currency Contracts [Member] | Fair Value Hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of income (expense) recognized in income	$ 1	$ 1	$ 1	$ 1
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Interest Expense	Interest Expense	Interest Expense	Interest Expense
Derivatives Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member] | Cash Flow Hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of income (expense) recognized in income	$ 7	$ (2)	$ 15	$ (4)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Interest Expense	Interest Expense	Interest Expense	Interest Expense
Derivatives Not Designated as Hedge Instruments [Member] | Foreign Currency Forward Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of income (expense) recognized in income	$ (1)	$ 2	$ (1)	$ 3
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Net Investment Income	Net Investment Income	Net Investment Income	Net Investment Income