Investments (Allowance on available-for-sale securities with credit impairments and PCD assets activity) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Allowance for credit losses:
Balance, beginning of period	$ 5	$ 45	$ 18	$ 40
Additions to the allowance for credit losses:
Securities for which credit losses were not previously recorded	0	0	0	14
Available-for-sale securities accounted for as PCD assets	0	2	3	8
Reductions to the allowance for credit losses:
Securities sold during the period (realized)	0	0	0	6
Write-offs charged against the allowance	0	16	12	16
Additional increases or (decreases) to the allowance for credit losses on securities that had an allowance recorded in a previous period	(2)	0	(6)	(9)
Balance, end of period	3	31	3	31
Corporate and other bonds
Allowance for credit losses:
Balance, beginning of period	0	24	11	23
Additions to the allowance for credit losses:
Securities for which credit losses were not previously recorded	0	0	0	14
Available-for-sale securities accounted for as PCD assets	0	2	0	4
Reductions to the allowance for credit losses:
Securities sold during the period (realized)	0	0	0	6
Write-offs charged against the allowance	0	16	12	16
Additional increases or (decreases) to the allowance for credit losses on securities that had an allowance recorded in a previous period	0	0	1	(9)
Balance, end of period	0	10	0	10
Asset-backed
Allowance for credit losses:
Balance, beginning of period	5	21	7	17
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	3	4
Reductions to the allowance for credit losses:
Securities sold during the period (realized)	0	0	0	0
Write-offs charged against the allowance	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	(2)	0	(7)	0
Balance, end of period	$ 3	$ 21	$ 3	$ 21