Deferred Policy Acquisition Costs - Rollforward of DAC (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance, beginning of year	$ 2,065	$ 2,117
Capitalization	2,536	2,665
Amortization expense	(2,522)	(2,543)
Other, including foreign exchange	56	(48)
Balance, end of year	$ 2,135	$ 2,191