Equity (Reclassifications Out of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net investment gains (losses)	$ 1,605		$ 231		$ 1,739	$ (57)
Net investment income	5,280		4,087		10,594	7,148
Net derivative gains (losses)	421		(710)		(1,814)	3,491
Other expenses	2,881		2,983		6,031	6,256
Income (loss) from continuing operations before provision for income tax	4,487		197		4,778	5,840
Income tax (expense) benefit	(1,075)		(47)		(1,003)	(1,289)
Net income (loss)	3,412	$ 363	150	$ 4,401	3,775	4,551
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income (loss)	104		297		(68)	77
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)	(6)		51		(55)	255
Net investment income	(4)		1		(9)	(10)
Net derivative gains (losses)	25		(6)		49	(12)
Income (loss) from continuing operations before provision for income tax	15		46		(15)	233
Income tax (expense) benefit	(3)		2		4	(46)
Net income (loss)	12		48		(11)	187
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	131		340		(43)	(98)
Income tax (expense) benefit	(27)		(74)		10	22
Net income (loss)	104		266		(33)	(76)
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)	19		42		48	48
Net investment income	15		9		27	15
Other expenses	0		0		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)	95		287		(124)	(164)
Net investment income	1		1		4	1
Other expenses	1		1		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)	(35)		(26)		(53)	(52)
Amortization of prior service (costs) credit	18		4		22	9
Income (loss) from continuing operations before provision for income tax	(17)		(22)		(31)	(43)
Income tax (expense) benefit	5		5		7	9
Net income (loss)	$ (12)		$ (17)		$ (24)	$ (34)