Segment Information 3 (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
Realized Investment Gains Losses From Continuing Operations [Abstract]
Realized Investment Gain Loss																$ 213	$ 44	$ 62
Less income taxes (benefits)																72	13	21
Net realized investment gains (losses)																141	31	41
Segment Reporting Information [Line Items]
Premiums and fees and other revenues																29,176	26,308	19,210
Mail order pharmacy revenues																1,827	1,623	1,447
Net investment income																1,164	1,144	1,146
Realized investment gains (losses) before income taxes																213	44	62
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
Shareholders' net income	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]
Shareholders' net income																1,335	1,592	1,219
Unallocated Amount to Segment [Member]
Segment Reporting Information [Line Items]
Realized investment gains (losses) from continuing operations, net of taxes and noncontrolling interest																$ 141	$ 31	$ 41

[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.