Changes in DAC and VOBA, ASU 2018-12 Transition (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021	Jan. 01, 2021	Dec. 31, 2020
Variable Annuities
Deferred Policy Acquisition Cost and Present Value of Future Profit [Line Items]
Deferred Policy Acquisition Cost	$ 2,265	$ 2,414	$ 2,469	$ 2,614		$ 2,786
Present Value of Future Insurance Profits, Net	317	341	350	377		428
Variable Annuities | Accounting Standards Update 2018-12
Deferred Policy Acquisition Cost and Present Value of Future Profit [Line Items]
Deferred Policy Acquisition Cost					$ 2,786
Present Value of Future Insurance Profits, Net					428
Variable Annuities | Accounting Standards Update 2018-12 | Previously Reported
Deferred Policy Acquisition Cost and Present Value of Future Profit [Line Items]
Deferred Policy Acquisition Cost						2,326
Present Value of Future Insurance Profits, Net						363
Variable Annuities | AOCI Attributable to Parent | Accounting Standards Update 2018-12 | Revision of Prior Period, Accounting Standards Update, Adjustment
Deferred Policy Acquisition Cost and Present Value of Future Profit [Line Items]
Deferred Policy Acquisition Cost					460
Present Value of Future Insurance Profits, Net					65
Fixed Rate Annuities
Deferred Policy Acquisition Cost and Present Value of Future Profit [Line Items]
Deferred Policy Acquisition Cost	108	107	98	88		64
Present Value of Future Insurance Profits, Net	61	65	66	70		76
Fixed Rate Annuities | Accounting Standards Update 2018-12
Deferred Policy Acquisition Cost and Present Value of Future Profit [Line Items]
Deferred Policy Acquisition Cost					64
Present Value of Future Insurance Profits, Net					76
Fixed Rate Annuities | Accounting Standards Update 2018-12 | Previously Reported
Deferred Policy Acquisition Cost and Present Value of Future Profit [Line Items]
Deferred Policy Acquisition Cost						64
Present Value of Future Insurance Profits, Net						76
Fixed Rate Annuities | AOCI Attributable to Parent | Accounting Standards Update 2018-12 | Revision of Prior Period, Accounting Standards Update, Adjustment
Deferred Policy Acquisition Cost and Present Value of Future Profit [Line Items]
Deferred Policy Acquisition Cost					0
Present Value of Future Insurance Profits, Net					0
Index-linked Annuities
Deferred Policy Acquisition Cost and Present Value of Future Profit [Line Items]
Deferred Policy Acquisition Cost	1,301	1,213	1,189	1,081		886
Present Value of Future Insurance Profits, Net	0	0	0	0		0
Index-linked Annuities | Accounting Standards Update 2018-12
Deferred Policy Acquisition Cost and Present Value of Future Profit [Line Items]
Deferred Policy Acquisition Cost					886
Present Value of Future Insurance Profits, Net					0
Index-linked Annuities | Accounting Standards Update 2018-12 | Previously Reported
Deferred Policy Acquisition Cost and Present Value of Future Profit [Line Items]
Deferred Policy Acquisition Cost						886
Present Value of Future Insurance Profits, Net						0
Index-linked Annuities | AOCI Attributable to Parent | Accounting Standards Update 2018-12 | Revision of Prior Period, Accounting Standards Update, Adjustment
Deferred Policy Acquisition Cost and Present Value of Future Profit [Line Items]
Deferred Policy Acquisition Cost					0
Present Value of Future Insurance Profits, Net					0
Term and Whole Life Insurance
Deferred Policy Acquisition Cost and Present Value of Future Profit [Line Items]
Deferred Policy Acquisition Cost	315	347	359	397		451
Present Value of Future Insurance Profits, Net	4	5	5	6		8
Term and Whole Life Insurance | Accounting Standards Update 2018-12
Deferred Policy Acquisition Cost and Present Value of Future Profit [Line Items]
Deferred Policy Acquisition Cost					451
Present Value of Future Insurance Profits, Net					8
Term and Whole Life Insurance | Accounting Standards Update 2018-12 | Previously Reported
Deferred Policy Acquisition Cost and Present Value of Future Profit [Line Items]
Deferred Policy Acquisition Cost						451
Present Value of Future Insurance Profits, Net						8
Term and Whole Life Insurance | AOCI Attributable to Parent | Accounting Standards Update 2018-12 | Revision of Prior Period, Accounting Standards Update, Adjustment
Deferred Policy Acquisition Cost and Present Value of Future Profit [Line Items]
Deferred Policy Acquisition Cost					0
Present Value of Future Insurance Profits, Net					0
Universal Life Insurance
Deferred Policy Acquisition Cost and Present Value of Future Profit [Line Items]
Deferred Policy Acquisition Cost	117	115	115	114		107
Present Value of Future Insurance Profits, Net	$ 32	$ 35	$ 36	$ 39		44
Universal Life Insurance | Accounting Standards Update 2018-12
Deferred Policy Acquisition Cost and Present Value of Future Profit [Line Items]
Deferred Policy Acquisition Cost					107
Present Value of Future Insurance Profits, Net					44
Universal Life Insurance | Accounting Standards Update 2018-12 | Previously Reported
Deferred Policy Acquisition Cost and Present Value of Future Profit [Line Items]
Deferred Policy Acquisition Cost						144
Present Value of Future Insurance Profits, Net						$ 38
Universal Life Insurance | AOCI Attributable to Parent | Accounting Standards Update 2018-12 | Revision of Prior Period, Accounting Standards Update, Adjustment
Deferred Policy Acquisition Cost and Present Value of Future Profit [Line Items]
Deferred Policy Acquisition Cost					(37)
Present Value of Future Insurance Profits, Net					$ 6