Investment Information - Allowance for expected credit losses (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Allowance for expected credit losses
Balance at beginning of period				$ 28
Balance at end of period		$ 27		27
Fixed maturities
Allowance for expected credit losses
Balance at beginning of period		32	$ 56	28	$ 41
Additions for current-period provision for expected credit losses		0	0	0	1
Additions (reductions) for previously recognized expected credit losses		(3)	6	2	21
Reductions due to disposals		(2)	(1)	(3)	(2)
Balance at end of period		27	61	27	61
Structured securities
Allowance for expected credit losses
Balance at beginning of period	[1]	7	8	7	9
Additions for current-period provision for expected credit losses	[1]	0	0	0	0
Additions (reductions) for previously recognized expected credit losses	[1]	3	0	3	(1)
Reductions due to disposals	[1]	0	0	0	0
Balance at end of period	[1]	10	8	10	8
Corporate bonds
Allowance for expected credit losses
Balance at beginning of period		24	45	20	30
Additions for current-period provision for expected credit losses		0	0	0	1
Additions (reductions) for previously recognized expected credit losses		(6)	6	(1)	21
Reductions due to disposals		(2)	(1)	(3)	(2)
Balance at end of period		16	50	16	50
Non-U.S. government securities
Allowance for expected credit losses
Balance at beginning of period		1	3	1	2
Additions for current-period provision for expected credit losses		0	0	0	0
Additions (reductions) for previously recognized expected credit losses		0	0	0	1
Reductions due to disposals		0	0	0	0
Balance at end of period		$ 1	$ 3	$ 1	$ 3

[1] Includes asset backed securities, residential mortgage backed securities and commercial mortgage backed securities.