Equity (Components of Accumulated Other Comprehensive Income (Loss)) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance beginning of period	$ 11,397	$ 6,083	$ 1,145
OCI before reclassifications	(9,283)	7,929	8,381
Income tax expense (benefit)	2,551	(2,766)	(3,011)
OCI before reclassifications, net of income tax	4,665	11,246	6,515
Amounts reclassified from AOCI	661	236	(654)
Income tax expense (benefit)	(222)	(85)	222
Amounts reclassified from AOCI, net of income tax	439	151	(432)
Balance end of period	5,104	11,397	6,083
Unrealized Investment Gains (Losses), Net of Related Offsets [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance beginning of period	13,588	7,689	3,161
OCI before reclassifications	(8,487)	9,321	7,637
Income tax expense (benefit)	2,807	(3,457)	(2,604)
OCI before reclassifications, net of income tax	7,908	13,553	8,194
Amounts reclassified from AOCI	411	58	(766)
Income tax expense (benefit)	(136)	(23)	261
Amounts reclassified from AOCI, net of income tax	275	35	(505)
Balance end of period	8,183	13,588	7,689
Unrealized Gains (Losses) on Derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance beginning of period	831	985	(39)
OCI before reclassifications	(937)	(262)	1,595
Income tax expense (benefit)	312	92	(557)
OCI before reclassifications, net of income tax	206	815	999
Amounts reclassified from AOCI	36	24	(21)
Income tax expense (benefit)	(11)	(8)	7
Amounts reclassified from AOCI, net of income tax	25	16	(14)
Balance end of period	231	831	985
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance beginning of period	(533)	(648)	(528)
OCI before reclassifications	(937)	(134)	42
Income tax expense (benefit)	(189)	249	(162)
OCI before reclassifications, net of income tax	(1,659)	(533)	(648)
Amounts reclassified from AOCI	0	0	0
Income tax expense (benefit)	0	0	0
Amounts reclassified from AOCI, net of income tax	0	0	0
Balance end of period	(1,659)	(533)	(648)
Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance beginning of period	(2,489)	(1,943)	(1,449)
OCI before reclassifications	1,078	(996)	(893)
Income tax expense (benefit)	(379)	350	312
OCI before reclassifications, net of income tax	(1,790)	(2,589)	(2,030)
Amounts reclassified from AOCI	214	154	133
Income tax expense (benefit)	(75)	(54)	(46)
Amounts reclassified from AOCI, net of income tax	139	100	87
Balance end of period	$ (1,651)	$ (2,489)	$ (1,943)