Investments - Net Investment Income (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 2,019	$ 1,933	$ 1,763
Less: investment expenses	70	75	74
Net investment income	1,949	1,858	1,689
Fixed maturities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	1,453	1,603	1,432
Financing Receivable, Nonaccrual	0	1
Equity securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	12	9	6
Mortgage loans on real estate
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	179	200	224
Policy loans
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	8	12	7
Short-term investments and cash equivalents
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	3	2	3
Limited partnerships and other
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 364	$ 107	$ 91

Amount of financing receivable on nonaccrual status.

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