Equity (Reclassifications Out of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net investment gains (losses)	$ (518)	$ 134
Net investment income	4,284	5,314
Net derivative gains (losses)	(859)	(2,235)
Other expenses	3,020	3,150
Income (loss) from continuing operations before provision for income tax	715	291
Income tax (expense) benefit	(41)	72
Net income (loss)	674	363
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income (loss)	(359)	(172)
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Investment Gains (Losses), Net of Related Offsets
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net investment gains (losses)	(350)	(49)
Net investment income	2	(5)
Net derivative gains (losses)	27	24
Income (loss) from continuing operations before provision for income tax	(321)	(30)
Income tax (expense) benefit	75	7
Net income (loss)	(246)	(23)
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains (Losses) on Derivatives
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income (loss) from continuing operations before provision for income tax	(112)	(174)
Income tax (expense) benefit	20	37
Net income (loss)	(92)	(137)
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains (Losses) on Derivatives | Interest Rate Contract
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net investment gains (losses)	18	29
Net investment income	15	12
Other expenses	1	1
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 investment gains (losses)	(148)	(219)
Net investment income	2	3
Reclassification out of Accumulated Other Comprehensive Income | Defined Benefit Plans Adjustment
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of net actuarial gains (losses)	(27)	(18)
Amortization of prior service (costs) credit	3	4
Income (loss) from continuing operations before provision for income tax	(24)	(14)
Income tax (expense) benefit	3	2
Net income (loss)	$ (21)	$ (12)