Equity (Reclassifications Out of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net investment gains (losses)	$ (96)	$ (67)
Net investment income	1,035	1,135
Net derivative gains (losses)	(588)	(61)	$ (585)	$ (3,986)
Pre-tax adjusted earnings	(692)	1,986
Income tax (expense) benefit	167	(412)
Net income (loss)	(525)	1,574	$ 3,711	$ 1,763
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income (loss)	(55)	(31)
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)	(68)	(39)
Net derivative gains (losses)	(1)	(2)
Pre-tax adjusted earnings	(69)	(41)
Income tax (expense) benefit	14	9
Net income (loss)	(55)	(32)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Pre-tax adjusted earnings	0	2
Income tax (expense) benefit	0	(1)
Net income (loss)	0	1
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Interest rate swaps
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net investment income	1	1
Net derivative gains (losses)	0	1
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Foreign currency swaps
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net derivative gains (losses)	$ (1)	$ 0