Fair Value (Financial Instruments Carried at Other Than Fair Value) (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2024
Assets
Policy loans	$ 1,039	$ 1,626
Liabilities
Separate account liabilities	80,311	79,006	$ 83,439
Carrying Value
Assets
Mortgage loans	22,834	23,254
Policy loans	1,039	1,626
Other invested assets	231	237
Premiums, reinsurance and other receivables	8,172	8,394
Liabilities
Policyholder account balances	29,770	31,830
Long-term debt	832	833
Other liabilities	1,434	1,360
Separate account liabilities	1,280	1,244
Estimated Fair Value
Assets
Mortgage loans	21,662	21,343
Policy loans	1,068	1,646
Other invested assets	231	237
Premiums, reinsurance and other receivables	9,644	9,145
Liabilities
Policyholder account balances	29,657	31,467
Long-term debt	802	785
Other liabilities	1,434	1,360
Separate account liabilities	1,280	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	504	1,123
Other invested assets	217	222
Premiums, reinsurance and other receivables	160	43
Liabilities
Policyholder account balances	0	0
Long-term debt	22	23
Other liabilities	752	648
Separate account liabilities	1,280	1,244
Estimated Fair Value | Level 3
Assets
Mortgage loans	21,662	21,343
Policy loans	564	523
Other invested assets	14	15
Premiums, reinsurance and other receivables	9,484	9,102
Liabilities
Policyholder account balances	29,657	31,467
Long-term debt	780	762
Other liabilities	682	712
Separate account liabilities	$ 0	$ 0