Insurance Liabilities - Unearned revenue liability (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Other Policyholder Funds Rollforward [Roll Forward]
Balance, beginning of year	$ 1,834	$ 1,811
Revenue deferred	114	106
Amortization	(92)	(90)
Balance, end of period	1,856	1,827
Life Insurance
Other Policyholder Funds Rollforward [Roll Forward]
Balance, beginning of year	1,727	1,693
Revenue deferred	114	106
Amortization	(83)	(82)
Balance, end of period	1,758	1,717
Institutional Markets
Other Policyholder Funds Rollforward [Roll Forward]
Balance, beginning of year	2	2
Revenue deferred	0	0
Amortization	(1)	0
Balance, end of period	1	2
Other Operations before consolidation and eliminations
Other Policyholder Funds Rollforward [Roll Forward]
Balance, beginning of year	105	116
Revenue deferred	0	0
Amortization	(8)	(8)
Balance, end of period	97	108
Other Operations before consolidation and eliminations | Fortitude RE
Other Policyholder Funds Rollforward [Roll Forward]
Balance, end of period	$ 1,500	$ 1,600