Segment Information (Certain Financial Information for the Reportable Segments) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Revenue	$ 13,712	$ 13,146	$ 29,264	$ 26,000
Total Assets	762,731		762,731		$ 766,655
Operating Segments
Segment Reporting Information [Line Items]
Revenue	12,500	11,113	24,307	22,049
Total Assets	698,838		698,838		695,764
Operating Segments | Total U.S. Retirement Solutions and Investment Management division
Segment Reporting Information [Line Items]
Revenue	5,156	3,353	9,554	6,708
Total Assets	400,641		400,641		404,839
Operating Segments | Total U.S. Retirement Solutions and Investment Management division | Individual Annuities
Segment Reporting Information [Line Items]
Revenue	1,200	1,171	2,387	2,328
Total Assets	171,938		171,938		174,951
Operating Segments | Total U.S. Retirement Solutions and Investment Management division | Retirement
Segment Reporting Information [Line Items]
Revenue	3,180	1,469	5,658	3,000
Total Assets	176,582		176,582		179,674
Operating Segments | Total U.S. Retirement Solutions and Investment Management division | Asset Management
Segment Reporting Information [Line Items]
Revenue	776	713	1,509	1,380
Total Assets	52,121		52,121		50,214
Operating Segments | Total U.S. Individual Life and Group Insurance division
Segment Reporting Information [Line Items]
Revenue	2,451	2,660	5,079	5,318
Total Assets	112,540		112,540		111,277
Operating Segments | Total U.S. Individual Life and Group Insurance division | Individual Life
Segment Reporting Information [Line Items]
Revenue	1,160	1,318	2,511	2,614
Total Assets	71,589		71,589		70,152
Operating Segments | Total U.S. Individual Life and Group Insurance division | Group Insurance
Segment Reporting Information [Line Items]
Revenue	1,291	1,342	2,568	2,704
Total Assets	40,951		40,951		41,125
Operating Segments | Total International Insurance division
Segment Reporting Information [Line Items]
Revenue	5,037	5,252	9,943	10,327
Total Assets	171,015		171,015		171,635
Operating Segments | Total International Insurance division | International Insurance
Segment Reporting Information [Line Items]
Revenue	5,037	5,252	9,943	10,327
Total Assets	171,015		171,015		171,635
Operating Segments | Total Corporate and Other
Segment Reporting Information [Line Items]
Revenue	(144)	(152)	(269)	(304)
Total Assets	14,642		14,642		8,013
Operating Segments | Total Corporate and Other | Corporate Operations
Segment Reporting Information [Line Items]
Revenue	(144)	(152)	(269)	(304)
Total Assets	14,642		14,642		8,013
Operating Segments | Closed Block Business
Segment Reporting Information [Line Items]
Revenue	0	1,835	0	3,401
Total Assets	0		0		70,891
Realized investment gains (losses), net, and related adjustments
Segment Reporting Information [Line Items]
Revenue	(60)	(202)	1,602	(153)
Charges related to realized investment gains (losses), net
Segment Reporting Information [Line Items]
Revenue	(133)	(3)	(79)	(11)
Investment gains (losses) on trading account assets supporting insurance liabilities, net
Segment Reporting Information [Line Items]
Revenue	(220)	225	(137)	326
Divested businesses: | Closed Block division
Segment Reporting Information [Line Items]
Revenue	1,525	0	3,244	0
Total Assets	63,893		63,893		0
Divested businesses: | Other divested businesses
Segment Reporting Information [Line Items]
Revenue	109	182	333	392
Equity in earnings of operating joint ventures and earnings attributable to noncontrolling interests
Segment Reporting Information [Line Items]
Revenue	(9)	(4)	(6)	(4)
Subtotal
Segment Reporting Information [Line Items]
Revenue	13,712	11,311	29,264	22,599
Total Assets	762,731		762,731		$ 695,764
Intersegment Eliminations | Total U.S. Retirement Solutions and Investment Management division | Asset Management
Segment Reporting Information [Line Items]
Revenue	$ 169	$ 154	$ 347	$ 310