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Segment Information - Summarized Financial Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Segment Reporting Information [Line Items]        
Premiums and fees, mail order pharmacy revenues and other revenues $ 9,174 $ 8,374 $ 18,292 $ 16,551
Net realized investment gains (losses) 13 43 61 70
Amortization of other acquired intangible assets, net of taxes (24) (29) (52) (61)
Special item charge, after-tax (65) 0 (65) 0
Shareholders' net income 588 573 1,121 1,101
Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Adjusted income from operations 729 615 1,313 1,223
Operating Segments [Member] | Global Health Benefits Segment [Member]        
Segment Reporting Information [Line Items]        
Premiums and fees, mail order pharmacy revenues and other revenues 7,416 6,726 14,787 13,272
Adjusted income from operations 528 428 972 895
Operating Segments [Member] | Global Supplemental Benefits Segment [Member]        
Segment Reporting Information [Line Items]        
Premiums and fees, mail order pharmacy revenues and other revenues 756 729 1,499 1,419
Adjusted income from operations 77 64 146 121
Operating Segments [Member] | Group Disability And Life Segment [Member]        
Segment Reporting Information [Line Items]        
Premiums and fees, mail order pharmacy revenues and other revenues 978 891 1,954 1,806
Adjusted income from operations 106 110 157 177
Operating Segments [Member] | Other Operations Segment [Member]        
Segment Reporting Information [Line Items]        
Premiums and fees, mail order pharmacy revenues and other revenues 30 30 62 60
Adjusted income from operations 18 13 38 30
Corporate And Eliminations Non Segment [Member]        
Segment Reporting Information [Line Items]        
Premiums and fees, mail order pharmacy revenues and other revenues (6) (2) (10) (6)
Adjusted income from operations $ (65) $ (56) $ (136) $ (131)