Deferred Policy Acquisition Costs - Rollforward of DAC (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance, beginning of year	$ 12,085	$ 12,857
Capitalization	1,221	1,689
Amortization expense	(1,104)	(1,293)
Other, including foreign exchange	(63)	51
Reclassified to held for sale	(28)
Balance, end of year	12,111	13,304
General Insurance
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance, beginning of year	2,075	2,310
Capitalization	882	1,358
Amortization expense	(828)	(1,034)
Other, including foreign exchange	(56)	40
Reclassified to held for sale	(1)
Balance, end of year	2,072	2,674
Life and Retirement | Individual Retirement
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance, beginning of year	4,735	4,597
Capitalization	170	187
Amortization expense	(148)	(137)
Other, including foreign exchange	0	0
Reclassified to held for sale	0
Balance, end of year	4,757	4,647
Life and Retirement | Group Retirement
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance, beginning of year	1,056	1,060
Capitalization	22	20
Amortization expense	(21)	(21)
Other, including foreign exchange	0	0
Reclassified to held for sale	0
Balance, end of year	1,057	1,059
Life and Retirement | Life Insurance
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance, beginning of year	4,149	4,839
Capitalization	134	120
Amortization expense	(104)	(99)
Other, including foreign exchange	(7)	11
Reclassified to held for sale	(27)
Balance, end of year	4,145	4,871
Life and Retirement | Institutional Markets
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance, beginning of year	70	51
Capitalization	13	4
Amortization expense	(3)	(2)
Other, including foreign exchange	0	0
Reclassified to held for sale	0
Balance, end of year	$ 80	$ 53