Deferred Policy Acquisition Costs - Rollforward of DAC (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance, beginning of year	$ 10,403	$ 9,679	$ 10,890
Acquisition costs deferred	4,643	4,666	4,292
Amortization expense	(4,954)	(4,562)	(4,188)
Change related to unrealized appreciation (depreciation) of investments	5,631	773	(1,116)
Dispositions	0	0	(298)
Other, including foreign exchange	(298)	(153)	99
Balance, end of year	15,425	10,403	9,679
Life Insurance
Summary of Significant Accounting Policies [Line Items]
Cumulative reductions in DAC	$ 3,300	$ (2,400)	$ (3,100)