Equity (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	$ 10,865	$ 11,529	$ 4,771	$ 10,649
OCI before reclassifications	5,288	(7,140)	14,205	(5,997)
Deferred income tax benefit (expense)	(1,608)	2,336	(4,239)	1,756
AOCI before reclassifications, net of income tax	14,545	6,725	14,737	6,408
Amounts reclassified from AOCI	111	(423)	(147)	75
Deferred income tax benefit (expense)	(24)	141	42	(40)
Amounts reclassified from AOCI, net of income tax	87	(282)	(105)	35
Balance, end of period	14,632	6,443	14,632	6,443
Unrealized Investment Gains (Losses), Net of Related Offsets
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	15,446	16,206	10,315	15,159
OCI before reclassifications	4,268	(6,511)	11,938	(4,885)
Deferred income tax benefit (expense)	(1,388)	2,178	(3,937)	1,677
AOCI before reclassifications, net of income tax	18,326	11,873	18,316	11,951
Amounts reclassified from AOCI	(183)	(177)	(166)	(290)
Deferred income tax benefit (expense)	61	65	54	100
Amounts reclassified from AOCI, net of income tax	(122)	(112)	(112)	(190)
Balance, end of period	18,204	11,761	18,204	11,761
Unrealized Gains (Losses) on Derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	1,725	1,555	1,458	1,076
OCI before reclassifications	800	(395)	1,496	(208)
Deferred income tax benefit (expense)	(269)	150	(468)	84
AOCI before reclassifications, net of income tax	2,256	1,310	2,486	952
Amounts reclassified from AOCI	243	(303)	(80)	251
Deferred income tax benefit (expense)	(68)	95	25	(101)
Amounts reclassified from AOCI, net of income tax	175	(208)	(55)	150
Balance, end of period	2,431	1,102	2,431	1,102
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	(4,282)	(3,986)	(4,950)	(3,303)
OCI before reclassifications	209	(237)	760	(907)
Deferred income tax benefit (expense)	53	9	170	(4)
AOCI before reclassifications, net of income tax	(4,020)	(4,214)	(4,020)	(4,214)
Amounts reclassified from AOCI	0	0	0	0
Deferred income tax benefit (expense)	0	0	0	0
Amounts reclassified from AOCI, net of income tax	0	0	0	0
Balance, end of period	(4,020)	(4,214)	(4,020)	(4,214)
Defined Benefit Plans Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	(2,024)	(2,246)	(2,052)	(2,283)
OCI before reclassifications	11	3	11	3
Deferred income tax benefit (expense)	(4)	(1)	(4)	(1)
AOCI before reclassifications, net of income tax	(2,017)	(2,244)	(2,045)	(2,281)
Amounts reclassified from AOCI	51	57	99	114
Deferred income tax benefit (expense)	(17)	(19)	(37)	(39)
Amounts reclassified from AOCI, net of income tax	34	38	62	75
Balance, end of period	$ (1,983)	$ (2,206)	$ (1,983)	$ (2,206)