Effect of Transition Adjustments on Stockholders’ Equity, ASU 2018-12 Transition (Details) - USD ($) $ in Millions	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Jan. 01, 2021	Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Liability for Future Policy Benefit, before Reinsurance	$ 29,924			$ 31,580
Deferred Policy Acquisition Costs and Present Value of Future Insurance Profits, Net	4,520		$ 4,642
Stockholder's Equity, Including Portion Attributable to Noncontrolling Interest	$ 5,369	$ 6,009	$ 6,514	$ 5,596	$ 7,985	$ 8,536
Retained Earnings (Deficit)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholder's Equity, Including Portion Attributable to Noncontrolling Interest								$ (5,200)
Retained Earnings (Deficit) | Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Liability for Future Policy Benefit, before Reinsurance							$ (434)
Market risk benefits and related adjustments							(5,971)
Deferred Policy Acquisition Costs and Present Value of Future Insurance Profits, Net							0
Reinsurance Recoverables, Including Reinsurance Premium Paid							(141)
Deferred income tax liability							1,375
Stockholder's Equity, Including Portion Attributable to Noncontrolling Interest							(5,171)
AOCI Attributable to Parent
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholder's Equity, Including Portion Attributable to Noncontrolling Interest								$ (3,900)
AOCI Attributable to Parent | Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Liability for Future Policy Benefit, before Reinsurance							(2,053)
Market risk benefits and related adjustments							(3,452)
Deferred Policy Acquisition Costs and Present Value of Future Insurance Profits, Net							494
Reinsurance Recoverables, Including Reinsurance Premium Paid							30
Deferred income tax liability							1,046
Stockholder's Equity, Including Portion Attributable to Noncontrolling Interest							$ (3,935)