Deferred Policy Acquisition Costs - Rollforward of DAC (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance, beginning of year	$ 2,106	$ 2,065
Capitalization	881	750
Amortization expense	(824)	(825)
Other, including foreign exchange	(35)	19
Balance, end of year	$ 2,128	$ 2,009