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Investments - Net Realized Capital Gains (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule of Investments [Line Items]
Equity Securities, FV-NI, Unrealized Gain (Loss)	$ 155	$ 53	$ 164
Total net realized capital gains (losses)	509	(14)	395
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	(21)	(48)	0
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Continental Europe Operations [Member] | Gain (Loss) on Investments [Member]
Schedule of Investments [Line Items]
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	21	48
Non-qualifying
Schedule of Investments [Line Items]
Non-qualifying foreign currency derivatives	12	104	(24)
Translation Adjustment Functional to Reporting Currency, Increase (Decrease), Gross of Tax	(1)	(1)
Non-qualifying | Other Credit Derivatives [Member]
Schedule of Investments [Line Items]
Non-qualifying foreign currency derivatives			(9)
Other investments
Schedule of Investments [Line Items]
Other, net	39	47	(35)
Equity Securities [Member]
Schedule of Investments [Line Items]
Equity Securities, FV-NI, Realized Gain (Loss)	81	(118)	78
Equity Securities, FV-NI, Unrealized Gain (Loss)	146	(96)	176
Debt and Equity Securities, Gain (Loss)	227	(214)	254
Total fixed maturities
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Realized Gain	319	255	234
Debt Securities, Available-for-sale, Realized Loss	(89)	(50)	(56)
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease)	4	(28)
Debt Securities, Available-for-sale, Allowance for Credit Loss, Sell before Recovery	0	(5)	0
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net			(3)
Mortgage loans
Schedule of Investments [Line Items]
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)	$ 9	$ (19)
SEC Schedule, 12-09, Valuation Allowances and Reserves, Increase (Decrease) Adjustment			$ (1)

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