Equity (Reclassifications Out of Accumulated Other Comprehensive Income (Loss)) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net investment gains (losses)	$ 109	$ (85)	$ (427)	$ 339
Net derivative gains (losses)	478	(546)	1,132	(2,866)
Net investment income	5,410	5,026	15,704	16,385
Other expenses	(4,218)	(3,977)	(12,603)	(12,140)
Income (loss) from continuing operations before provision for income tax	2,952	976	6,728	2,784
Provision for income tax expense (benefit)	(858)	(3)	(1,916)	(308)
Net income (loss)	2,094	975	4,809	2,477
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income (loss)	(193)	64	23	139
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)	181	(96)	375	365
Net derivative gains (losses)	33	0	105	0
Net investment income	14	22	99	65
Income (loss) from continuing operations before provision for income tax	214	(95)	563	374
Provision for income tax expense (benefit)	(62)	40	(176)	(123)
Net income (loss)	152	(55)	387	251
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)	(14)	(21)	(16)	(56)
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	(471)	224	(337)	(10)
Provision for income tax expense (benefit)	158	(70)	114	4
Net income (loss)	(313)	154	(223)	(6)
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)	1	3	28	17
Net investment income	3	2	7	6
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)	(10)	2	(8)	8
Net investment income	0	1	2	2
Other expenses	1	(1)	2	(2)
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)	(466)	216	(368)	(41)
Net investment income	(1)	0	(2)	(2)
Other expenses	0	1	1	1
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Derivatives [Member] | Credit forwards [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net investment income	1	0	1	1
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Other Comprehensive Income (Loss) Foreign Currency Translation Adjustments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net investment gains (losses)	0	0	(77)	0
Provision for income tax expense (benefit)	0	0	27	0
Net income (loss)	0	0	(50)	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)	(45)	(71)	(136)	(212)
Amortization of prior service (costs) credit	0	17	0	51
Income (loss) from continuing operations before provision for income tax	(45)	(54)	(136)	(161)
Provision for income tax expense (benefit)	13	19	45	55
Net income (loss)	$ (32)	$ (35)	$ (91)	$ (106)