Derivative Financial Instruments - Effect of Qualifying Hedge Accounting (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Derivative Instruments, Gain (Loss) [Line Items]
Net investment income	$ 569	$ 560
Net gains (losses)	(45)	(34)
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	1	(37)
Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	22	(47)
Interest rate contracts \| Cash Flow Hedging \| Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	0	0
Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(2)	5
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Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings	0	0
Foreign exchange contracts \| Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings	(3)	4
Foreign exchange contracts \| Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Net	1	0
Foreign exchange contracts \| Designated as Hedging Instrument \| Income Statement Location [Axis]: us-gaap:NetInvestmentIncome
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings	0	0
Foreign exchange contracts \| Designated as Hedging Instrument \| Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings	4	(4)
Foreign exchange contracts \| Cash Flow Hedging \| Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	2	2
Foreign exchange contracts \| Cash Flow Hedging \| Designated as Hedging Instrument \| Income Statement Location [Axis]: us-gaap:NetInvestmentIncome
Derivative Instruments, Gain (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	2	2
Foreign exchange contracts \| Cash Flow Hedging \| Designated as Hedging Instrument \| Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses
Derivative Instruments, Gain (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	$ 0	$ 0

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Net gain (loss) relating to components of the gain (loss) on the fair value hedging instrument excluded from the assessment of fair value hedge effectiveness. Recognized in earnings.

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