Equity (Reclassifications Out of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net investment gains (losses)	$ (63)	$ 279	$ 92
Net investment income	4,815	3,528	3,486
Net derivative gains (losses)	(2,359)	(132)	(2,046)
Income (loss) before provision for income tax	(4)	(1,738)	(1,146)
Income tax expense (benefit)	71	433	338
Net income (loss)	67	(1,305)	(808)
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income (loss)	3	255	91
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)	(4)	319	94
Net investment income	0	0	0
Net derivative gains (losses)	(3)	(14)	(37)
Income (loss) before provision for income tax	(7)	305	57
Income tax expense (benefit)	1	(64)	(12)
Net income (loss)	(6)	241	45
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]
Income (loss) before provision for income tax	12	18	58
Income tax expense (benefit)	(3)	(4)	(12)
Net income (loss)	9	14	46
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	3	3	2
Net derivative gains (losses)	2	2	31
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)	$ 7	$ 13	$ 25