Fair Value (Financial Instruments Carried at Other Than Fair Value) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Assets
Policy loans	$ 9,036	$ 9,111
Liabilities
Collateral financing arrangement	754	766
Junior subordinated debt securities	3,156	3,156
Separate account liabilities	165,056	179,873
Carrying Value
Assets
Mortgage loans (2)	79,849	79,226
Policy loans	9,036	9,111
Other invested assets	1,012	1,025
Premiums, reinsurance and other receivables	2,383	2,262
Other assets	282	290
Liabilities
Policyholder account balances	127,693	123,865
Long-term debt	13,773	13,852
Collateral financing arrangement	754	766
Junior subordinated debt securities	3,156	3,156
Other liabilities	2,649	2,143
Separate account liabilities	87,397	95,619
Estimated Fair Value
Assets
Mortgage loans (2)	80,164	82,788
Policy loans	10,387	10,751
Other invested assets	1,012	1,025
Premiums, reinsurance and other receivables	2,532	2,454
Other assets	282	291
Liabilities
Policyholder account balances	127,117	127,728
Long-term debt	15,084	16,621
Collateral financing arrangement	609	630
Junior subordinated debt securities	3,882	4,447
Other liabilities	3,210	2,835
Separate account liabilities	87,397	95,619
Estimated Fair Value | Level 1
Assets
Mortgage loans (2)	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
Junior subordinated debt securities	0	0
Other liabilities	0	0
Separate account liabilities	0	0
Estimated Fair Value | Level 2
Assets
Mortgage loans (2)	0	0
Policy loans	0	0
Other invested assets	791	769
Premiums, reinsurance and other receivables	637	492
Other assets	97	101
Liabilities
Policyholder account balances	0	0
Long-term debt	15,084	16,621
Collateral financing arrangement	0	0
Junior subordinated debt securities	3,882	4,447
Other liabilities	1,053	514
Separate account liabilities	87,397	95,619
Estimated Fair Value | Level 3
Assets
Mortgage loans (2)	80,164	82,788
Policy loans	10,387	10,751
Other invested assets	221	256
Premiums, reinsurance and other receivables	1,895	1,962
Other assets	185	190
Liabilities
Policyholder account balances	127,117	127,728
Long-term debt	0	0
Collateral financing arrangement	609	630
Junior subordinated debt securities	0	0
Other liabilities	2,157	2,321
Separate account liabilities	$ 0	$ 0