Reinsurance - Rollforward of the Reinsurance Recoverable Allowance for Credit Losses (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	$ 255	$ 253	$ 255	$ 260
Addition to (release of) allowance for expected credit losses and disputes, net	(1)	(1)	0	(4)
Write-offs charged against the allowance for credit losses and disputes	0	0	(1)	(1)
Other changes	6	2	6	(1)
Balance, end of period	$ 260	$ 254	$ 260	$ 254