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)	$ 1,529	$ (110)	$ 444
Net investment income	21,395	17,117	18,868
Net derivative gains (losses)	(2,228)	1,349	628
Other expenses	12,586	13,150	13,689
Income (loss) from continuing operations before provision for income tax	8,126	6,927	6,795
Income tax (expense) benefit	(1,551)	(1,509)	(886)
Net income (loss)	6,575	5,418	5,909
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income (loss)	(189)	866	399
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)	72	362	270
Net investment income	(16)	(24)	(30)
Net derivative gains (losses)	69	19	25
Income (loss) from continuing operations before provision for income tax	125	357	265
Income tax (expense) benefit	(29)	(83)	(61)
Net income (loss)	96	274	204
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	(250)	1,016	268
Income tax (expense) benefit	39	(358)	27
Net income (loss)	(211)	658	295
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains (Losses) on Derivatives | Interest rate contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net investment gains (losses)	84	121	4
Net investment income	56	36	23
Other expenses	3	2	2
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)	(403)	851	240
Net investment income	8	4	(4)
Other expenses	2	2	2
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains (Losses) on Derivatives | Credit derivatives
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net investment income	0	0	1
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)	(120)	(105)	(145)
Amortization of prior service (costs) credit	29	19	27
Income (loss) from continuing operations before provision for income tax	(91)	(86)	(118)
Income tax (expense) benefit	17	20	18
Net income (loss)	$ (74)	$ (66)	$ (100)