Equity (Components of Accumulated Other Comprehensive Income (Loss)) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	$ 10,649	$ 5,104
OCI before reclassifications	1,143	4,956
Deferred income tax benefit (expense)	(580)	(1,725)
OCI before reclassifications, net of income tax	11,212	8,335
Amounts reclassified from AOCI	498	(182)
Deferred income tax benefit (expense)	(181)	62
Amounts reclassified from AOCI, net of income tax	317	(120)
Balance, end of period	11,529	8,215
Unrealized Investment Gains (Losses), Net of Related Offsets
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	15,159	8,183
OCI before reclassifications	1,626	4,852
Deferred income tax benefit (expense)	(501)	(1,645)
OCI before reclassifications, net of income tax	16,284	11,390
Amounts reclassified from AOCI	(113)	(173)
Deferred income tax benefit (expense)	35	59
Amounts reclassified from AOCI, net of income tax	(78)	(114)
Balance, end of period	16,206	11,276
Unrealized Gains (Losses) on Derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	1,076	231
OCI before reclassifications	187	321
Deferred income tax benefit (expense)	(66)	(113)
OCI before reclassifications, net of income tax	1,197	439
Amounts reclassified from AOCI	554	(54)
Deferred income tax benefit (expense)	(196)	19
Amounts reclassified from AOCI, net of income tax	358	(35)
Balance, end of period	1,555	404
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	(3,303)	(1,659)
OCI before reclassifications	(670)	(217)
Deferred income tax benefit (expense)	(13)	33
OCI before reclassifications, net of income tax	(3,986)	(1,843)
Amounts reclassified from AOCI	0	0
Deferred income tax benefit (expense)	0	0
Amounts reclassified from AOCI, net of income tax	0	0
Balance, end of period	(3,986)	(1,843)
Defined Benefit Plans Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	(2,283)	(1,651)
OCI before reclassifications	0	0
Deferred income tax benefit (expense)	0	0
OCI before reclassifications, net of income tax	(2,283)	(1,651)
Amounts reclassified from AOCI	57	45
Deferred income tax benefit (expense)	(20)	(16)
Amounts reclassified from AOCI, net of income tax	37	29
Balance, end of period	$ (2,246)	$ (1,622)