Separate Accounts (Net Amount at Risk and Cash Surrender Values) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Net Amount at Risk by Product and Guarantee [Line Items]
Policyholder Account Balance	$ 83,294		$ 75,209
Separate account liabilities	83,489	$ 81,690	81,124
Universal Life Insurance
Net Amount at Risk by Product and Guarantee [Line Items]
Policyholder Account Balance	1,990	1,980	2,033	$ 2,100
Separate account liabilities	2,407		2,086
Total account balances	4,397		4,119
Net amount at risk	21,872		23,332
Cash surrender value	4,198		3,862
Variable Annuities
Net Amount at Risk by Product and Guarantee [Line Items]
Policyholder Account Balance	3,982	4,111	4,539	4,664
Separate account liabilities	78,834	77,086	76,881	74,845
Total account balances	82,816		81,420
Net amount at risk	12,205		14,757
Cash surrender value	82,391		81,110
Index-linked Annuities
Net Amount at Risk by Product and Guarantee [Line Items]
Policyholder Account Balance	44,350	41,627	35,922	33,896
Separate account liabilities	0		0
Total account balances	44,350		35,922
Cash surrender value	41,958		33,567
Fixed Rate Annuities
Net Amount at Risk by Product and Guarantee [Line Items]
Policyholder Account Balance	14,923	14,672	14,684	14,274
Separate account liabilities	0		0
Total account balances	14,923		14,684
Cash surrender value	14,260		14,106
ULSG
Net Amount at Risk by Product and Guarantee [Line Items]
Policyholder Account Balance	4,984	5,052	5,219	5,307
Separate account liabilities	0		0
Total account balances	4,984		5,219
Net amount at risk	64,837		70,062
Cash surrender value	4,455		6,203
Company-Owned Life Insurance
Net Amount at Risk by Product and Guarantee [Line Items]
Policyholder Account Balance	856	653	644	641
Separate account liabilities	2,039	$ 2,148	2,005	$ 1,919
Total account balances	2,895		2,649
Net amount at risk	2,671		3,407
Cash surrender value	$ 2,366		$ 2,430