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Segment Information (Tables)
3 Months Ended
Mar. 31, 2014
Segment Information Details [Abstract]  
Summarized segment financial information
  Three Months Ended
  March 31,
(In millions) 20142013
Premiums and fees, Mail order pharmacy revenues and Other revenues     
Global Health Care $ 6,546$ 6,297
Global Supplemental Benefits   690  612
Group Disability and Life   915  858
Other Operations   30  (7)
Corporate   (4)  (3)
Total $ 8,177$ 7,757
Shareholders' net income      
Global Health Care $ 439$ 427
Global Supplemental Benefits   53  55
Group Disability and Life   67  (2)
Other Operations   17  (462)
Corporate   (75)  (54)
Segment earnings (loss)   501  (36)
Realized investment gains, net of taxes   27  93
Shareholders' net income $ 528$ 57