Deferred Policy Acquisition Costs, Value of Business Acquired and Other Intangibles (Information Regarding DAC and VOBA) (Details) - USD ($) $ in Millions	9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
Deferred Policy Acquisition Cost and Present Value of Future Profit [Line Items]
Balance, end of period, Total DAC and VOBA	$ 4,520		$ 4,642
Variable Annuities
Deferred Policy Acquisition Cost and Present Value of Future Profit [Line Items]
Balance, beginning of period, DAC	2,414	$ 2,614	2,614	$ 2,786
Capitalization	29	48	54	90
Amortization	(178)	(193)	(254)	(262)
Balance, end of period, DAC	2,265	2,469	2,414	2,614
Balance, beginning of period, VOBA	341	377	377	428
Amortization	(24)	(27)	(36)	(51)
Balance, end of period, VOBA	317	350	341	377
Balance, end of period, Total DAC and VOBA	2,582	2,819	2,755	2,991
Fixed Rate Annuities
Deferred Policy Acquisition Cost and Present Value of Future Profit [Line Items]
Balance, beginning of period, DAC	107	88	88	64
Capitalization	9	20	31	36
Amortization	(8)	(10)	(12)	(12)
Balance, end of period, DAC	108	98	107	88
Balance, beginning of period, VOBA	65	70	70	76
Amortization	(4)	(4)	(5)	(6)
Balance, end of period, VOBA	61	66	65	70
Balance, end of period, Total DAC and VOBA	169	164	172	158
Index-linked Annuities
Deferred Policy Acquisition Cost and Present Value of Future Profit [Line Items]
Balance, beginning of period, DAC	1,213	1,081	1,081	886
Capitalization	255	253	330	355
Amortization	(167)	(145)	(198)	(160)
Balance, end of period, DAC	1,301	1,189	1,213	1,081
Balance, beginning of period, VOBA	0	0	0	0
Amortization	0	0	0	0
Balance, end of period, VOBA	0	0	0	0
Balance, end of period, Total DAC and VOBA	1,301	1,189	1,213	1,081
Term and Whole Life Insurance
Deferred Policy Acquisition Cost and Present Value of Future Profit [Line Items]
Balance, beginning of period, DAC	347	397	397	451
Capitalization	1	(1)	(1)	(3)
Amortization	(33)	(37)	(49)	(51)
Balance, end of period, DAC	315	359	347	397
Balance, beginning of period, VOBA	5	6	6	8
Amortization	(1)	(1)	(1)	(2)
Balance, end of period, VOBA	4	5	5	6
Balance, end of period, Total DAC and VOBA	319	364	352	403
Universal Life Insurance
Deferred Policy Acquisition Cost and Present Value of Future Profit [Line Items]
Balance, beginning of period, DAC	115	114	114	107
Capitalization	9	8	10	16
Amortization	(7)	(7)	(9)	(9)
Balance, end of period, DAC	117	115	115	114
Balance, beginning of period, VOBA	35	39	39	44
Amortization	(3)	(3)	(4)	(5)
Balance, end of period, VOBA	32	36	35	39
Balance, end of period, Total DAC and VOBA	$ 149	$ 151	$ 150	$ 153