Reserves for Future Policy Benefits and Claims Payable - Undiscounted and Discounted Expected Future Gross Premiums (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Payout Annuities
Liability for Future Policy Benefit, Activity [Line Items]
Expected future benefit payments, undiscounted	$ 1,579	$ 1,542
Expected future benefit payments, discounted	1,043	999
Expected future gross premiums, undiscounted	0	0
Expected future gross premiums, discounted	0	0
Closed Block Life
Liability for Future Policy Benefit, Activity [Line Items]
Expected future benefit payments, undiscounted	7,729	8,751
Expected future benefit payments, discounted	5,251	5,578
Expected future gross premiums, undiscounted	5,056	5,976
Expected future gross premiums, discounted	3,119	3,489
Closed Block Annuity
Liability for Future Policy Benefit, Activity [Line Items]
Expected future benefit payments, undiscounted	5,421	5,834
Expected future benefit payments, discounted	3,565	3,729
Expected future gross premiums, undiscounted	0	0
Expected future gross premiums, discounted	$ 0	$ 0