Derivative Financial Instruments - Effect on Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Derivatives Instruments and Hedging Activities Disclosure [Line Items]
Net Investment Income	$ 435	$ 361	$ 1,282	$ 1,110
Realized capital gains (losses)	(30)	(26)	(99)	(22)
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	26	(100)	(16)	9
Interest rate contracts | Cash flow hedges | Designated as Hedging Instrument
Derivatives Instruments and Hedging Activities Disclosure [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, before Tax	0	0	0	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	0	0	0	0
Foreign exchange contracts | Cash flow hedges | Designated as Hedging Instrument
Derivatives Instruments and Hedging Activities Disclosure [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, before Tax	6	(23)	(41)	(14)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	$ 1	$ 4	$ 3	$ 9