Fair Value (Financial Instruments Carried at Other Than Fair Value) (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 2024
Assets
Policy loans	$ 1,026	$ 1,626
Liabilities
Separate account liabilities	79,403	79,006	$ 81,575
Carrying Value
Assets
Mortgage loans	22,964	23,254
Policy loans	1,026	1,626
Other invested assets	231	237
Premiums, reinsurance and other receivables	8,671	8,394
Liabilities
Policyholder account balances	30,942	31,830
Long-term debt	833	833
Other liabilities	1,699	1,360
Separate account liabilities	1,241	1,244
Estimated Fair Value
Assets
Mortgage loans	21,559	21,343
Policy loans	1,050	1,646
Other invested assets	231	237
Premiums, reinsurance and other receivables	9,758	9,145
Liabilities
Policyholder account balances	30,673	31,467
Long-term debt	782	785
Other liabilities	1,699	1,360
Separate account liabilities	1,241	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	499	1,123
Other invested assets	217	222
Premiums, reinsurance and other receivables	67	43
Liabilities
Policyholder account balances	0	0
Long-term debt	22	23
Other liabilities	1,008	648
Separate account liabilities	1,241	1,244
Estimated Fair Value | Level 3
Assets
Mortgage loans	21,559	21,343
Policy loans	551	523
Other invested assets	14	15
Premiums, reinsurance and other receivables	9,691	9,102
Liabilities
Policyholder account balances	30,673	31,467
Long-term debt	760	762
Other liabilities	691	712
Separate account liabilities	$ 0	$ 0