Insurance Liabilities - Unearned Revenue Liability (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Other Policyholder Funds Rollforward [Roll Forward]
Balance, beginning of year	$ 1,865	$ 1,834
Revenue deferred	40	38
Amortization	(30)	(30)
Balance, end of period	1,875	1,842
Life Insurance
Other Policyholder Funds Rollforward [Roll Forward]
Balance, beginning of year	1,770	1,727
Revenue deferred	40	38
Amortization	(28)	(27)
Balance, end of period	1,782	1,738
Institutional Markets
Other Policyholder Funds Rollforward [Roll Forward]
Balance, beginning of year	1	2
Revenue deferred	0	0
Amortization	0	(1)
Balance, end of period	1	1
Other
Other Policyholder Funds Rollforward [Roll Forward]
Balance, beginning of year	94	105
Revenue deferred	0	0
Amortization	(2)	(2)
Balance, end of period	92	103
Other reconciling items	$ 1,400	$ 1,600