Equity (Reclassifications Out of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net investment gains (losses)	$ (84)	$ (20)			$ 1,655	$ (77)
Net investment income	5,568	4,729			16,162	11,877
Net derivative gains (losses)	(218)	(581)			(2,032)	2,910
Other expenses	3,284	3,470			9,315	9,726
Income (loss) from continuing operations before provision for income tax	2,042	923			6,820	6,763
Income tax (expense) benefit	(453)	(214)			(1,456)	(1,503)
Net income (loss)	1,589	709	$ 3,775	$ 4,551	5,364	5,260
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income (loss)	(140)	367			(208)	444
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)	97	65			42	320
Net investment income	(4)	(8)			(13)	(18)
Net derivative gains (losses)	(2)	7			47	(5)
Income (loss) from continuing operations before provision for income tax	91	64			76	297
Income tax (expense) benefit	(22)	(41)			(18)	(87)
Net income (loss)	69	23			58	210
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	(236)	457			(279)	359
Income tax (expense) benefit	54	(97)			64	(75)
Net income (loss)	(182)	360			(215)	284
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)	6	10			54	58
Net investment income	14	9			41	24
Other expenses	1	1			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)	(259)	435			(383)	271
Net investment income	2	2			6	3
Other expenses	0	0			1	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)	(34)	(26)			(87)	(78)
Amortization of prior service (costs) credit	4	5			26	14
Income (loss) from continuing operations before provision for income tax	(30)	(21)			(61)	(64)
Income tax (expense) benefit	3	5			10	14
Net income (loss)	$ (27)	$ (16)			$ (51)	$ (50)