Changes in LFPBs, ASU 2018-12 Transition (Details) - USD ($) $ in Millions	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Jan. 01, 2022	Dec. 31, 2021	Jan. 01, 2021	Dec. 31, 2020
Liability for Future Policy Benefit, Activity [Line Items]
Accumulated other comprehensive income (loss)	$ (6,867)	$ (5,701)	$ (5,931)	$ (6,799)	$ (4,056)		$ (199)
Future policy benefits	29,924		31,146				39,830
Previously Reported
Liability for Future Policy Benefit, Activity [Line Items]
Accumulated other comprehensive income (loss)			(5,282)				3,901
Future policy benefits			41,105				43,589
Accounting Standards Update 2018-12 | Revision of Prior Period, Accounting Standards Update, Adjustment
Liability for Future Policy Benefit, Activity [Line Items]
Accumulated other comprehensive income (loss)			(649)				(4,100)
Future policy benefits			(9,959)				(3,759)
Term and Whole Life Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance	8,194			8,093
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change			296			$ 179	181	$ 100
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change	5,071		5,172	5,145			6,253		$ 6,606
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance	26		32	33			42
Future policy benefits	$ 2,281		$ 2,336	$ 2,313			$ 2,999
Term and Whole Life Insurance | Accounting Standards Update 2018-12
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance								3,332
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance								59
Future policy benefits								3,273
Term and Whole Life Insurance | Accounting Standards Update 2018-12 | Previously Reported
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance									2,797
Term and Whole Life Insurance | Accounting Standards Update 2018-12 | Revision of Prior Period, Accounting Standards Update, Adjustment
Liability for Future Policy Benefit, Activity [Line Items]
Accumulated other comprehensive income (loss)								0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change								13
Deferred Profit Liabilities								0
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change								522
Income Annuity [Domain] | Accounting Standards Update 2018-12
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance								4,809
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance								29
Future policy benefits								4,780
Income Annuity [Domain] | Accounting Standards Update 2018-12 | Previously Reported
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance									4,260
Income Annuity [Domain] | Accounting Standards Update 2018-12 | Revision of Prior Period, Accounting Standards Update, Adjustment
Liability for Future Policy Benefit, Activity [Line Items]
Accumulated other comprehensive income (loss)								(203)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change								(168)
Deferred Profit Liabilities								172
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change								748
Structured Settlement and Pension Risk Transfer Annuities [Domain] | Accounting Standards Update 2018-12
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance								11,518
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance								102
Future policy benefits								11,416
Structured Settlement and Pension Risk Transfer Annuities [Domain] | Accounting Standards Update 2018-12 | Previously Reported
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance									$ 10,115
Structured Settlement and Pension Risk Transfer Annuities [Domain] | Accounting Standards Update 2018-12 | Revision of Prior Period, Accounting Standards Update, Adjustment
Liability for Future Policy Benefit, Activity [Line Items]
Accumulated other comprehensive income (loss)								(1,784)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change								200
Deferred Profit Liabilities								217
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change								$ 2,770