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Investments - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Accrued interest receivable	$ 278	$ 253
FHLB collateral pledged	2,840	2,469
Available for sale securities, allowance for credit losses	$ 11	$ 8	$ 7	$ 19
Commercial mortgage loans, percentage of investments	7.00%
DSC ratio, amortization period	25 years
Cannae Holdings Inc. | Equity securities
Debt Securities, Available-for-sale [Line Items]
Investment owned, (in shares)	4,775,598	5,775,598
Investment owned, at fair value	$ 114	$ 203
Shares issued in exchange (in shares)	1,000,000
Aggregate consideration received	$ 24
Residential mortgage loans
Debt Securities, Available-for-sale [Line Items]
Loans over 90 days past due	2,010	1,606
Over 90 days past due | Residential mortgage loans
Debt Securities, Available-for-sale [Line Items]
Loans over 90 days past due	63	72
Loans in process of foreclosure	$ 39	39
United States
Debt Securities, Available-for-sale [Line Items]
Residential mortgage loans, location percentage	100.00%
Available-for-sale Securities
Debt Securities, Available-for-sale [Line Items]
Assets held by insurance regulators	$ 15,578	$ 22,343
Residential Mortgage
Debt Securities, Available-for-sale [Line Items]
Percentage of total investments	5.00%

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