Market Risk Benefits - Rollforward of market risk benefits (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
Market Risk Benefit [Roll Forward]
Balance, beginning of year	$ 4,034	$ 7,034
Balance, beginning of year, before effect of changes in our own credit risk	3,569	4,933
Issuances	555	178
Interest accrual	134	146
Attributed fees	685	691
Expected claims	(70)	(55)
Effect of changes in interest rates	(1,322)	(4,289)
Effect of changes in interest rate volatility	(5)	284
Effect of changes in equity markets	(652)	2,087
Effect of changes in equity index volatility	(31)	(80)
Actual outcome different from model expected outcome	165	153
Effect of changes in future expected policyholder behavior	(2)	(20)
Effect of changes in other future expected assumptions	(126)	(85)
Other, including foreign exchange	(3)	(8)
Balance, end of period, before effect of changes in our own credit risk	2,897	3,935
Effect of changes in our own credit risk	715	55	$ (465)	$ (2,101)
Balance, end of period	3,612	3,990
Less: Reinsured MRB, end of period	(71)	(98)
Net	3,541	3,892
Combined
Net amount at risk
Net amount at risk	1,792	2,686
GMDB
Net amount at risk
Net amount at risk	1,457	2,617
GMWB
Net amount at risk
Net amount at risk	25	15
Individual Retirement
Market Risk Benefit [Roll Forward]
Balance, beginning of year	3,738	6,452
Balance, beginning of year, before effect of changes in our own credit risk	3,297	4,518
Issuances	527	161
Interest accrual	122	130
Attributed fees	636	637
Expected claims	(68)	(53)
Effect of changes in interest rates	(1,223)	(3,929)
Effect of changes in interest rate volatility	(7)	267
Effect of changes in equity markets	(591)	1,923
Effect of changes in equity index volatility	(27)	(80)
Actual outcome different from model expected outcome	155	139
Effect of changes in future expected policyholder behavior	(1)	(2)
Effect of changes in other future expected assumptions	(86)	(85)
Other, including foreign exchange	0	4
Balance, end of period, before effect of changes in our own credit risk	2,734	3,630
Effect of changes in our own credit risk	662	63	(441)	(1,934)
Balance, end of period	3,396	3,693
Less: Reinsured MRB, end of period	(71)	(98)
Net	$ 3,325	$ 3,595
Net amount at risk
Average attained age of contract holders by product	70 years	70 years
Individual Retirement | Combined
Net amount at risk
Net amount at risk	$ 1,764	$ 2,670
Individual Retirement | GMDB
Net amount at risk
Net amount at risk	1,200	2,059
Individual Retirement | GMWB
Net amount at risk
Net amount at risk	24	15
Group Retirement
Market Risk Benefit [Roll Forward]
Balance, beginning of year	296	582
Balance, beginning of year, before effect of changes in our own credit risk	272	415
Issuances	28	17
Interest accrual	12	16
Attributed fees	49	54
Expected claims	(2)	(2)
Effect of changes in interest rates	(99)	(360)
Effect of changes in interest rate volatility	2	17
Effect of changes in equity markets	(61)	164
Effect of changes in equity index volatility	(4)	0
Actual outcome different from model expected outcome	10	14
Effect of changes in future expected policyholder behavior	(1)	(18)
Effect of changes in other future expected assumptions	(40)	0
Other, including foreign exchange	(3)	(12)
Balance, end of period, before effect of changes in our own credit risk	163	305
Effect of changes in our own credit risk	53	(8)	$ (24)	$ (167)
Balance, end of period	216	297
Less: Reinsured MRB, end of period	0	0
Net	$ 216	$ 297
Net amount at risk
Average attained age of contract holders by product	64 years	64 years
Group Retirement | Combined
Net amount at risk
Net amount at risk	$ 28	$ 16
Group Retirement | GMDB
Net amount at risk
Net amount at risk	257	558
Group Retirement | GMWB
Net amount at risk
Net amount at risk	$ 1	$ 0