Equity (Reclassifications Out of Accumulated Other Comprehensive Income (Loss)) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net investment gains (losses)	$ (401)	$ 374
Net derivative gains (losses)	343	(630)
Net investment income	5,035	6,077
Other expenses	(4,163)	(4,138)
Income (loss) from continuing operations before provision for income tax	1,826	1,247
Provision for income tax expense (benefit)	(484)	(252)
Net income (loss)	1,339	992
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income (loss)	120	6
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Investment Gains (Losses), Net of Related Offsets [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net investment gains (losses)	108	290
Net derivative gains (losses)	35	0
Net investment income	26	21
Income (loss) from continuing operations before provision for income tax	173	280
Provision for income tax expense (benefit)	(59)	(121)
Net income (loss)	114	159
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Other-than-Temporary Impairment [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net investment gains (losses)	4	(31)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Derivatives [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income (loss) from continuing operations before provision for income tax	54	(181)
Provision for income tax expense (benefit)	(19)	65
Net income (loss)	35	(116)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Derivatives [Member] | Interest Rate Swaps [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net derivative gains (losses)	15	4
Net investment income	2	2
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Derivatives [Member] | Interest Rate Forwards [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net derivative gains (losses)	0	3
Net investment income	1	1
Other expenses	0	(1)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Derivatives [Member] | Foreign Currency Swaps [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net derivative gains (losses)	36	(189)
Net investment income	(1)	(1)
Other expenses	1	0
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined Benefit Plans Adjustment [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of net actuarial gains (losses)	(44)	(71)
Amortization of prior service (costs) credit	(1)	16
Income (loss) from continuing operations before provision for income tax	(45)	(55)
Provision for income tax expense (benefit)	16	18
Net income (loss)	$ (29)	$ (37)