Equity (Components of Accumulated Other Comprehensive Income (Loss)) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	$ 5,104	$ 11,397
OCI before reclassifications	4,956	(833)
Income tax expense (benefit)	(1,725)	22
OCI before reclassifications, net of income tax	8,335	10,586
Amounts reclassified from AOCI	(182)	(44)
Income tax expense (benefit)	62	38
Amounts reclassified from AOCI, net of income tax	(120)	(6)
Balance, end of period	8,215	10,580
Unrealized Investment Gains (Losses), Net of Related Offsets [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	8,183	13,590
OCI before reclassifications	4,852	(174)
Income tax expense (benefit)	(1,645)	75
OCI before reclassifications, net of income tax	11,390	13,491
Amounts reclassified from AOCI	(173)	(280)
Income tax expense (benefit)	59	121
Amounts reclassified from AOCI, net of income tax	(114)	(159)
Balance, end of period	11,276	13,332
Unrealized Gains (Losses) on Derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	231	829
OCI before reclassifications	321	(62)
Income tax expense (benefit)	(113)	22
OCI before reclassifications, net of income tax	439	789
Amounts reclassified from AOCI	(54)	181
Income tax expense (benefit)	19	(65)
Amounts reclassified from AOCI, net of income tax	(35)	116
Balance, end of period	404	905
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	(1,659)	(533)
OCI before reclassifications	(217)	(597)
Income tax expense (benefit)	33	(75)
OCI before reclassifications, net of income tax	(1,843)	(1,205)
Amounts reclassified from AOCI	0	0
Income tax expense (benefit)	0	0
Amounts reclassified from AOCI, net of income tax	0	0
Balance, end of period	(1,843)	(1,205)
Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	(1,651)	(2,489)
OCI before reclassifications	0	0
Income tax expense (benefit)	0	0
OCI before reclassifications, net of income tax	(1,651)	(2,489)
Amounts reclassified from AOCI	45	55
Income tax expense (benefit)	(16)	(18)
Amounts reclassified from AOCI, net of income tax	29	37
Balance, end of period	$ (1,622)	$ (2,452)