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Investments - Net Realized Capital Gains (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule of Investments [Line Items]
Gross gains on sales	$ 255	$ 234	$ 114
Gross losses on sales	(50)	(56)	(172)
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease)	(9)
Debt Securities, Available-for-sale, Allowance for Credit Loss, Sell before Recovery	(5)	0	0
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net		(3)	(1)
Total net realized capital gains (losses)	(14)	395	(112)
Equity Securities, FV-NI, Unrealized Gain (Loss)	53	164	(80)
Discontinued Operation, Amount of Adjustment to Prior Period Gain (Loss) on Disposal, Net of Tax	(48)	0	202
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Continental Europe Operations [Member] | Interest rate swaps
Schedule of Investments [Line Items]
Discontinued Operation, Amount of Adjustment to Prior Period Gain (Loss) on Disposal, Net of Tax	48
Other investments
Schedule of Investments [Line Items]
Other, net	47	(35)	(5)
Non-qualifying
Schedule of Investments [Line Items]
Non-qualifying foreign currency derivatives	104	(24)	(12)
Non-qualifying | Other Credit Derivatives [Member]
Schedule of Investments [Line Items]
Non-qualifying foreign currency derivatives	(1)	(9)	1
Equity Securities [Member]
Schedule of Investments [Line Items]
Debt and Equity Securities, Gain (Loss)	(214)	254	(48)
Total fixed maturities
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease)	(28)
Mortgage loans
Schedule of Investments [Line Items]
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)	$ (19)
SEC Schedule, 12-09, Valuation Allowances and Reserves, Increase (Decrease) Adjustment		$ (1)	$ 0

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