Investments - Allowance for Credit Losses (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Accrued interest receivables on available-for-sale fixed maturity securities	$ 374	$ 374	$ 374	$ 374	$ 369
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Beginning balance	17	43	18	40
Securities for which credit losses were not previously recorded				14
Available-for-sale securities accounted for as PCD assets	3	4	3	6
Write-offs charged against the allowance	12		12
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance For Credit Loss, Securities Sold				6
Additional decreases to the allowance for credit losses on securities that had an allowance recorded in a previous period	(3)	(2)	(4)	(9)
Total allowance for credit losses	5	45	5	45
Corporate and Other Bonds
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Beginning balance	12	27	11	23
Securities for which credit losses were not previously recorded				14
Available-for-sale securities accounted for as PCD assets				2
Write-offs charged against the allowance	12		12
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance For Credit Loss, Securities Sold				6
Additional decreases to the allowance for credit losses on securities that had an allowance recorded in a previous period		(3)	1	(9)
Total allowance for credit losses	0	24	0	24
Asset-backed
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Beginning balance	5	16	7	17
Securities for which credit losses were not previously recorded
Available-for-sale securities accounted for as PCD assets	3	4	3	4
Write-offs charged against the allowance
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance For Credit Loss, Securities Sold
Additional decreases to the allowance for credit losses on securities that had an allowance recorded in a previous period	(3)	1	(5)
Total allowance for credit losses	$ 5	$ 21	$ 5	$ 21