Fair Value (Financial Instruments Carried at Other Than Fair Value) (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024
Assets
Policy loans	$ 1,038	$ 1,626
Liabilities
Separate account liabilities	76,257	79,006	$ 83,489
Carrying Value
Assets
Mortgage loans	23,021	23,254
Policy loans	1,038	1,626
Other invested assets	238	237
Premiums, reinsurance and other receivables	8,561	8,394
Liabilities
Policyholder account balances	30,754	31,830
Long-term debt	833	833
Other liabilities	1,431	1,360
Separate account liabilities	1,147	1,244
Estimated Fair Value
Assets
Mortgage loans	21,524	21,343
Policy loans	1,064	1,646
Other invested assets	238	237
Premiums, reinsurance and other receivables	9,416	9,145
Liabilities
Policyholder account balances	30,457	31,467
Long-term debt	774	785
Other liabilities	1,431	1,360
Separate account liabilities	1,147	1,244
Estimated Fair Value | Level 1
Assets
Mortgage loans	0	0
Policy loans	0	0
Other invested assets	0	0
Premiums, reinsurance and other receivables	0	0
Liabilities
Policyholder account balances	0	0
Long-term debt	0	0
Other liabilities	0	0
Separate account liabilities	0	0
Estimated Fair Value | Level 2
Assets
Mortgage loans	0	0
Policy loans	525	1,123
Other invested assets	223	222
Premiums, reinsurance and other receivables	172	43
Liabilities
Policyholder account balances	0	0
Long-term debt	22	23
Other liabilities	729	648
Separate account liabilities	1,147	1,244
Estimated Fair Value | Level 3
Assets
Mortgage loans	21,524	21,343
Policy loans	539	523
Other invested assets	15	15
Premiums, reinsurance and other receivables	9,244	9,102
Liabilities
Policyholder account balances	30,457	31,467
Long-term debt	752	762
Other liabilities	702	712
Separate account liabilities	$ 0	$ 0