Deferred Policy Acquisition Costs - Rollforward of DAC (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance, beginning of year	$ 12,857	$ 13,001
Capitalization	4,260	3,756
Amortization expense	(3,673)	(3,423)
Other, including foreign exchange	(67)	(373)
Reclassified to held for sale	(1,378)
Balance, end of year	11,999	12,961
General Insurance
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance, beginning of year	2,310	2,428
Capitalization	3,310	2,960
Amortization expense	(2,884)	(2,668)
Other, including foreign exchange	(76)	(242)
Reclassified to held for sale	(623)
Balance, end of year	2,037	2,478
Individual Retirement
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance, beginning of year	4,597	4,553
Capitalization	519	420
Amortization expense	(422)	(380)
Other, including foreign exchange	0	0
Reclassified to held for sale	0
Balance, end of year	4,694	4,593
Group Retirement
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance, beginning of year	1,060	1,078
Capitalization	55	44
Amortization expense	(62)	(59)
Other, including foreign exchange	0	0
Reclassified to held for sale	0
Balance, end of year	1,053	1,063
Life Insurance
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance, beginning of year	4,839	4,904
Capitalization	354	319
Amortization expense	(299)	(311)
Other, including foreign exchange	9	(131)
Reclassified to held for sale	(755)
Balance, end of year	4,148	4,781
Institutional Markets
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance, beginning of year	51	38
Capitalization	22	13
Amortization expense	(6)	(5)
Other, including foreign exchange	0	0
Reclassified to held for sale	0
Balance, end of year	$ 67	$ 46