Policyholders' Liabilities (Additional Insurance Reserves) (Details) - Policyholder Contract Deposit - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Total
Policyholder Account Balance [Line Items]
Balance, beginning of period	$ 5,067	$ 4,295
Unearned revenue	257	247
Amortization expense	(63)	(50)
Other adjustments	0	1
FX adjustment	(18)	(2)
Balance, end of period	5,243	4,491
Less: Reinsurance recoverables	398	0
Unearned revenue reserve net of reinsurance recoverables	4,845	4,491
Other Businesses
Policyholder Account Balance [Line Items]
Unearned revenue reserve net of reinsurance recoverables	51	53
Total, including Other Businesses
Policyholder Account Balance [Line Items]
Unearned revenue reserve net of reinsurance recoverables	4,896	4,544
Variable Universal Life | Individual Life
Policyholder Account Balance [Line Items]
Balance, beginning of period	4,613	3,983
Unearned revenue	215	204
Amortization expense	(58)	(47)
Other adjustments	0	0
FX adjustment	0	0
Balance, end of period	4,770	4,140
Less: Reinsurance recoverables	398	0
Unearned revenue reserve net of reinsurance recoverables	4,372	4,140
Life Planner | International Businesses
Policyholder Account Balance [Line Items]
Balance, beginning of period	359	231
Unearned revenue	37	37
Amortization expense	(4)	(2)
Other adjustments	0	1
FX adjustment	(14)	(2)
Balance, end of period	378	265
Less: Reinsurance recoverables	0	0
Unearned revenue reserve net of reinsurance recoverables	378	265
Gibraltar Life and Other | International Businesses
Policyholder Account Balance [Line Items]
Balance, beginning of period	95	81
Unearned revenue	5	6
Amortization expense	(1)	(1)
Other adjustments	0	0
FX adjustment	(4)	0
Balance, end of period	95	86
Less: Reinsurance recoverables	0	0
Unearned revenue reserve net of reinsurance recoverables	$ 95	$ 86