Equity (Reclassifications Out of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net investment gains (losses)	$ (52)	$ (40)			$ (213)	$ (171)
Net derivative gains (losses)	(838)	(590)			(3,251)	1,329	$ (585)	$ (3,986)
Net investment income	1,174	857			3,381	3,036
Pre-tax adjusted earnings	647	432			(327)	4,570
Income tax (expense) benefit	(121)	(78)			119	(909)
Net income (loss)	526	354	$ (734)	$ 3,307	(208)	3,661	$ 3,711	$ 1,763
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income (loss)	(33)	(28)			(128)	(103)
Reclassification out of Accumulated Other Comprehensive Income | Net unrealized investment gains (losses):
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net investment gains (losses)	(43)	(36)			(159)	(133)
Net derivative gains (losses)	(1)	(9)			(9)	(14)
Pre-tax adjusted earnings	(44)	(45)			(168)	(147)
Income tax (expense) benefit	9	10			35	31
Net income (loss)	(35)	(35)			(133)	(116)
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains (Losses) on Derivatives
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Pre-tax adjusted earnings	2	9			6	16
Income tax (expense) benefit	0	(2)			(1)	(3)
Net income (loss)	2	7			5	13
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains (Losses) on Derivatives | Interest rate swaps
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net derivative gains (losses)	0	0			(2)	4
Net investment income	1	1			3	3
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains (Losses) on Derivatives | Foreign currency swaps
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net derivative gains (losses)	$ 1	$ 8			$ 5	$ 9