Investments (Allowance on available-for-sale securities with credit impairments and PCD assets activity) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Allowance for credit losses:
Balance, beginning of period	$ 75	$ 47	$ 69	$ 45
Additions to the allowance for credit losses:
Securities for which credit losses were not previously recorded	0	3	3	3
Available-for-sale securities accounted for as PCD assets	1	0	1	0
Reductions to the allowance for credit losses:
Securities disposed during the period (realized)	16	6	16	6
Additional increases or (decreases) to the allowance for credit losses on securities that had an allowance recorded in a previous period	3	7	6	9
Balance, end of period	63	51	63	51
Corporate and other bonds
Allowance for credit losses:
Balance, beginning of period	31	15	28	13
Additions to the allowance for credit losses:
Securities for which credit losses were not previously recorded	0	3	3	3
Available-for-sale securities accounted for as PCD assets	1	0	1	0
Reductions to the allowance for credit losses:
Securities disposed during the period (realized)	16	6	16	6
Additional increases or (decreases) to the allowance for credit losses on securities that had an allowance recorded in a previous period	0	2	0	4
Balance, end of period	16	14	16	14
Asset-backed
Allowance for credit losses:
Balance, beginning of period	44	32	41	32
Additions to the allowance for credit losses:
Securities for which credit losses were not previously recorded	0	0	0	0
Available-for-sale securities accounted for as PCD assets	0	0	0	0
Reductions to the allowance for credit losses:
Securities disposed during the period (realized)	0	0	0	0
Additional increases or (decreases) to the allowance for credit losses on securities that had an allowance recorded in a previous period	3	5	6	5
Balance, end of period	$ 47	$ 37	$ 47	$ 37