Investments (Net Investment Income) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income	$ 6,268,000,000	$ 5,685,000,000	$ 5,454,000,000
Investment expense	(153,000,000)	(175,000,000)	(231,000,000)
Net investment income	6,115,000,000	5,510,000,000	5,223,000,000
Fixed Maturity AFS Securities [Member] | AFS Securities [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income	4,351,000,000	4,334,000,000	4,281,000,000
Trading Securities [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income	167,000,000	202,000,000	191,000,000
Equity Securities [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income	3,000,000	3,000,000	4,000,000
Mortgage Loans On Real Estate [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income	680,000,000	677,000,000	629,000,000
Real estate [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income		1,000,000	1,000,000
Policy loans [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income	115,000,000	125,000,000	129,000,000
Invested Cash [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income		12,000,000	40,000,000
Commercial mortgage loan prepayment and bond makewhole premiums [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income	199,000,000	82,000,000	119,000,000
Alternative investments [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income	679,000,000	197,000,000	22,000,000
Consent fees [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income	10,000,000	7,000,000	8,000,000
Other Investments [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income	$ 64,000,000	$ 45,000,000	$ 30,000,000