Policyholder Contract Deposits and Other Policyholder Funds - Unearned revenue liability (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Jan. 01, 2021
Other Policyholder Funds Rollforward [Roll Forward]
Balance, beginning of year	$ 1,834	$ 1,811	$ 1,795
Revenue deferred	153	143	140
Amortization	(122)	(120)	(123)
Other, including foreign exchange			(1)
Balance, end of year	1,865	1,834	1,811
Other reconciling items	997	1,051	1,068
Other policyholder funds	2,862	2,885	2,879	$ 2,740
Life Insurance
Other Policyholder Funds Rollforward [Roll Forward]
Balance, beginning of year	1,727	1,693	1,661
Revenue deferred	153	143	140
Amortization	(110)	(109)	(108)
Other, including foreign exchange			0
Balance, end of year	1,770	1,727	1,693
Institutional Markets
Other Policyholder Funds Rollforward [Roll Forward]
Balance, beginning of year	2	2	2
Revenue deferred	0	0	0
Amortization	(1)	0	0
Other, including foreign exchange			0
Balance, end of year	1	2	2
Corporate and Other
Other Policyholder Funds Rollforward [Roll Forward]
Balance, beginning of year	105	116	132
Revenue deferred	0	0	0
Amortization	(11)	(11)	(15)
Other, including foreign exchange			(1)
Balance, end of year	$ 94	$ 105	$ 116