Investments - Allowance for credit losses on fixed maturities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Allowance for Credit Losses [Roll Forward]
Beginning balance	$ 11	$ 16	$ 12	$ 11
Provision for expected credit losses on securities with no previous allowance	0	0	1	6
Additions to previously recognized expected credit losses	0	0	1	(1)
Reductions due to sales or redemptions	(1)	0	(4)	0
Ending balance	10	16	10	16
Structured securities
Allowance for Credit Losses [Roll Forward]
Beginning balance	11	11	9	10
Provision for expected credit losses on securities with no previous allowance	0	0	1	1
Additions to previously recognized expected credit losses	0	0	1	0
Reductions due to sales or redemptions	(1)	0	(1)	0
Ending balance	10	11	10	11
Corporate and other
Allowance for Credit Losses [Roll Forward]
Beginning balance	0	5	3	1
Provision for expected credit losses on securities with no previous allowance	0	0	0	5
Additions to previously recognized expected credit losses	0	0	0	(1)
Reductions due to sales or redemptions	0	0	(3)	0
Ending balance	$ 0	$ 5	$ 0	$ 5