Equity (Reclassifications Out of Accumulated Other Comprehensive Income (Loss)) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net investment gains (losses)	$ (125)	$ 110	$ (536)	$ 424
Net derivative gains (losses)	311	(1,690)	654	(2,320)
Net investment income	5,259	5,282	10,294	11,359
Other expenses	(4,222)	(4,025)	(8,385)	(8,163)
Income (loss) from continuing operations before provision for income tax	1,950	561	3,776	1,808
Provision for income tax expense (benefit)	(574)	(53)	(1,058)	(305)
Net income (loss)	1,376	510	2,715	1,502
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income (loss)	96	69	216	75
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)	86	171	194	461
Net derivative gains (losses)	37	0	72	0
Net investment income	59	22	85	43
Income (loss) from continuing operations before provision for income tax	176	189	349	469
Provision for income tax expense (benefit)	(55)	(42)	(114)	(163)
Net income (loss)	121	147	235	306
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)	(6)	(4)	(2)	(35)
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	80	(53)	134	(234)
Provision for income tax expense (benefit)	(25)	9	(44)	74
Net income (loss)	55	(44)	90	(160)
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)	12	10	27	14
Net investment income	2	2	4	4
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)	2	3	2	6
Net investment income	1	0	2	1
Other expenses	1	0	1	(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)	62	(68)	98	(257)
Net investment income	0	(1)	(1)	(2)
Other expenses	0	0	1	0
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	0	1	0	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)	(77)	0	(77)	0
Provision for income tax expense (benefit)	27	0	27	0
Net income (loss)	(50)	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)	(47)	(70)	(91)	(141)
Amortization of prior service (costs) credit	1	18	0	34
Income (loss) from continuing operations before provision for income tax	(46)	(52)	(91)	(107)
Provision for income tax expense (benefit)	16	18	32	36
Net income (loss)	$ (30)	$ (34)	$ (59)	$ (71)