Segment Information 2 (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended															12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013	Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Premiums and fees and other revenues																$ 29,176	$ 26,308	$ 19,210
Net investment income																1,164	1,144	1,146
Total revenues	8,151		8,066	7,980		8,183		7,620		7,323		7,422		6,754		32,380	29,119	21,865
Depreciation and amortization																597	560	345
Income taxes																698	853	615
Segment earnings	361	[1]	553	505	[2]	57	[3]	406	[4]	466	[5]	380	[6]	371	[7]	1,476	1,623	1,260
Operating Segments [Member]
Segment Reporting Information [Line Items]
Segment earnings																1,335	1,592	1,219
Run-off Reinsurance [Member]
Segment Reporting Information [Line Items]
Premiums and fees and other revenues																(38)	(98)	20
Net investment income																19	102	103
Total revenues																(19)	4	123
Depreciation and amortization																0	0	0
Income taxes																(262)	0	(99)
Segment earnings																(488)	0	(183)
Other Operations Segment [Member]
Segment Reporting Information [Line Items]
Premiums and fees and other revenues																152	155	169
Net investment income																389	388	400
Total revenues																541	543	569
Depreciation and amortization																1	1	2
Income taxes																25	43	29
Segment earnings																$ 94	$ 82	$ 89

[1] The fourth quarter of 2013 includes an after-tax charge of $40 million for an organizational efficiency plan.

[2] The second quarter of 2013 includes an after-tax charge of $24 million for the Pharmacy Benefits Manager (“PBM”) partnering agreement with Catamaran.

[3] The first quarter of 2013 includes an after-tax gain of $25 for the GMIB business, an after-tax charge of $507 million for the transaction with Berkshire to effectively exit the Run-off Reinsurance business, and an after-tax charge of $51 million related to the disability claims regulatory matter in the Group Disability and Life segment.

[4] The fourth quarter of 2012 includes an after-tax gain of $7 million for the GMIB business and an after-tax charge of $68 million for litigation matters.

[5] The third quarter of 2012 includes an after-tax gain of $32 million for the GMIB business, an after-tax charge of $12 million for costs associated with acquisitions, and an after-tax charge of $50 million for costs associated with an organizational efficiency plan.

[6] The second quarter of 2012 includes an after-tax loss of $51 million for the GMIB business.

[7] The first quarter of 2012 includes an after-tax gain of $41 million for the GMIB business, an after-tax charge of $28 million for costs associated with acquisitions, and an after-tax charge of $13 million for costs associated a litigation matter in Global Health Care.