Fair Value (Financial Instruments Carried at Other Than Fair Value) (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Assets
Policy loans	$ 8,664	$ 8,545
Liabilities
Collateral financing arrangement	438	476
Subordinated debt securities	4,153	3,164
Separate account liabilities	143,175	139,504
Carrying Value
Assets
Mortgage loans	86,868	89,012
Policy loans	8,664	8,545
Other invested assets	882	1,202
Premiums, reinsurance and other receivables	4,869	4,831
Other assets	256	228
Liabilities
Policyholder account balances	147,172	139,882
Long-term debt	15,366	15,080
Collateral financing arrangement	438	476
Subordinated debt securities	4,153	3,164
Other liabilities	10,478	9,635
Separate account liabilities	75,011	70,359
Estimated Fair Value
Assets
Mortgage loans	84,240	84,217
Policy loans	9,245	9,058
Other invested assets	882	1,202
Premiums, reinsurance and other receivables	4,823	4,798
Other assets	261	236
Liabilities
Policyholder account balances	144,032	134,612
Long-term debt	15,008	14,498
Collateral financing arrangement	384	425
Subordinated debt securities	4,663	3,587
Other liabilities	10,418	9,304
Separate account liabilities	75,011	70,359
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
Other assets	0	0
Liabilities
Policyholder account balances	0	0
Long-term debt	0	0
Collateral financing arrangement	0	0
Subordinated debt securities	0	0
Other liabilities	0	0
Separate account liabilities	0	0
Estimated Fair Value | Level 2
Assets
Mortgage loans	0	0
Policy loans	0	0
Other invested assets	700	704
Premiums, reinsurance and other receivables	1,101	881
Other assets	61	69
Liabilities
Policyholder account balances	0	0
Long-term debt	15,008	14,498
Collateral financing arrangement	0	0
Subordinated debt securities	4,663	3,587
Other liabilities	1,956	734
Separate account liabilities	75,011	70,359
Estimated Fair Value | Level 3
Assets
Mortgage loans	84,240	84,217
Policy loans	9,245	9,058
Other invested assets	182	498
Premiums, reinsurance and other receivables	3,722	3,917
Other assets	200	167
Liabilities
Policyholder account balances	144,032	134,612
Long-term debt	0	0
Collateral financing arrangement	384	425
Subordinated debt securities	0	0
Other liabilities	8,462	8,570
Separate account liabilities	$ 0	$ 0