Deferred Policy Acquisition Costs - Rollforward of DAC (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance, beginning of year	$ 12,857	$ 13,001
Capitalization	1,689	1,402
Amortization expense	(1,293)	(1,137)
Other, including foreign exchange	51	(47)
Balance, end of year	13,304	13,219
General Insurance
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance, beginning of year	2,310	2,428
Capitalization	1,358	1,129
Amortization expense	(1,034)	(893)
Other, including foreign exchange	40	(16)
Balance, end of year	2,674	2,648
Individual Retirement
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance, beginning of year	4,597	4,553
Capitalization	187	143
Amortization expense	(137)	(118)
Other, including foreign exchange	0	0
Balance, end of year	4,647	4,578
Group Retirement
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance, beginning of year	1,060	1,078
Capitalization	20	15
Amortization expense	(21)	(19)
Other, including foreign exchange	0	0
Balance, end of year	1,059	1,074
Life Insurance
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance, beginning of year	4,839	4,904
Capitalization	120	112
Amortization expense	(99)	(106)
Other, including foreign exchange	11	(30)
Balance, end of year	4,871	4,880
Institutional Markets
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance, beginning of year	51	38
Capitalization	4	3
Amortization expense	(2)	(1)
Other, including foreign exchange	0	(1)
Balance, end of year	$ 53	$ 39