Fair Value (Financial Instruments Carried at Other Than Fair Value) (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Assets
Policy loans	$ 8,663	$ 8,545
Liabilities
Collateral financing arrangement	463	476
Subordinated debt securities	4,153	3,164
Separate account liabilities	138,143	139,504
Carrying Value
Assets
Mortgage loans	87,908	89,012
Policy loans	8,663	8,545
Other invested assets	891	1,202
Premiums, reinsurance and other receivables	4,963	4,831
Other assets	248	228
Liabilities
Policyholder account balances	142,851	139,882
Long-term debt	14,689	15,080
Collateral financing arrangement	463	476
Subordinated debt securities	4,153	3,164
Other liabilities	10,527	9,635
Separate account liabilities	72,231	70,359
Estimated Fair Value
Assets
Mortgage loans	84,675	84,217
Policy loans	9,250	9,058
Other invested assets	891	1,202
Premiums, reinsurance and other receivables	4,890	4,798
Other assets	250	236
Liabilities
Policyholder account balances	138,851	134,612
Long-term debt	14,276	14,498
Collateral financing arrangement	414	425
Subordinated debt securities	4,585	3,587
Other liabilities	10,322	9,304
Separate account liabilities	72,231	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	698	704
Premiums, reinsurance and other receivables	1,065	881
Other assets	62	69
Liabilities
Policyholder account balances	0	0
Long-term debt	14,276	14,498
Collateral financing arrangement	0	0
Subordinated debt securities	4,585	3,587
Other liabilities	1,803	734
Separate account liabilities	72,231	70,359
Estimated Fair Value | Level 3
Assets
Mortgage loans	84,675	84,217
Policy loans	9,250	9,058
Other invested assets	193	498
Premiums, reinsurance and other receivables	3,825	3,917
Other assets	188	167
Liabilities
Policyholder account balances	138,851	134,612
Long-term debt	0	0
Collateral financing arrangement	414	425
Subordinated debt securities	0	0
Other liabilities	8,519	8,570
Separate account liabilities	$ 0	$ 0