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Segment Information (Tables)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Segment Information Table [Abstract]    
Summarized segment financial information
  Three Months EndedNine Months Ended
  September 30,September 30,
(In millions) 2012201120122011
Premiums and fees, Mail order pharmacy revenues and Other revenues         
Health Care $ 5,385$ 3,671$ 15,788$ 11,101
International   938  768  2,717  2,212
Disability and Life   758  698  2,250  2,103
Run-off Reinsurance   (37)  138  (90)  114
Other Operations   36  40  114  126
Corporate   (16)  (15)  (50)  (44)
Total $ 7,064$ 5,300$ 20,729$ 15,612
Shareholders' net income          
Health Care $ 345$ 248$ 919$ 775
International   70  62  215  180
Disability and Life   60  62  214  232
Run-off Reinsurance   25  (180)  (7)  (189)
Other Operations   22  25  63  68
Corporate   (63)  (43)  (203)  (116)
Segment Earnings   459  174  1,201  950
Realized investment gains, net of taxes   7  9  16  37
Shareholders' net income $ 466$ 183$ 1,217$ 987
          
  Three Months EndedNine Months Ended
  September 30,September 30,
(In millions) 2012201120122011
Premiums and fees, Mail order pharmacy revenues and Other revenues         
Health Care $ 5,385$ 3,671$ 15,788$ 11,101
International   938  768  2,717  2,212
Disability and Life   758  698  2,250  2,103
Run-off Reinsurance   (37)  138  (90)  114
Other Operations   36  40  114  126
Corporate   (16)  (15)  (50)  (44)
Total $ 7,064$ 5,300$ 20,729$ 15,612
Shareholders' net income          
Health Care $ 345$ 248$ 919$ 775
International   70  62  215  180
Disability and Life   60  62  214  232
Run-off Reinsurance   25  (180)  (7)  (189)
Other Operations   22  25  63  68
Corporate   (63)  (43)  (203)  (116)
Segment Earnings   459  174  1,201  950
Realized investment gains, net of taxes   7  9  16  37
Shareholders' net income $ 466$ 183$ 1,217$ 987