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Segment Information (Tables)
 12 Months Ended
Dec. 31, 2011
Segment Information [Table] [Abstract]  
Health Care Segment Financial Data Table [Text Block]
(In millions)201120102009
Health Care      
Premiums and fees:       
Medical:      
Guaranteed cost (1),(2)$ 4,176$ 3,929$ 3,380
Experience-rated (2),(3)  1,934  1,823  1,699
Stop loss  1,451  1,287  1,274
Dental  894  804  731
Medicare   489  1,470  595
Medicare Part D   624  558  342
Other (4)  600  543  515
Total medical  10,168  10,414  8,536
Life and other non-medical  77  103  179
Total premiums  10,245  10,517  8,715
Fees (2),(5)  2,936  2,802  2,669
Total premiums and fees  13,181  13,319  11,384
Mail order pharmacy revenues  1,447  1,420  1,282
Other revenues  234  266  262
Net investment income  274  243  181
Segment revenues$ 15,136$ 15,248$ 13,109
Income taxes$ 556$ 476$ 399
Segment earnings$ 991$ 861$ 731
       
(1) Includes guaranteed cost premiums primarily associated with open access and commercial HMO, as well as other risk-related products.
(2) Premiums and/or fees associated with certain specialty products are also included.
(3) Includes minimum premium arrangements with a risk profile similar to experience-rated funding arrangements. The risk portion of minimum revenue is reported in experience-rated medical premium whereas the self funding portion of minimum premium revenue is recorded in fees. Also includes certain non-participating cases for which special customer level reporting of experience is required.
(4) Other medical premiums include risk revenue for specialty products.
(5) Represents administrative service fees for medical members and related specialty product fees for non-medical members as well as fees related to Medicare Part D of $61 million in 2011, $57 million in 2010 and $41 million in 2009.
 
Other Segments Financial Data Table [Text Block]
(In millions)201120102009
Disability and Life      
Premiums and fees:       
Life$ 1,256$ 1,238$ 1,301
Disability  1,268  1,167  1,057
Other  256  262  276
Total  2,780  2,667  2,634
Other revenues  -  123  113
Net investment income  267  261  244
Segment revenues$ 3,047$ 3,051$ 2,991
Income taxes$ 109$ 120$ 109
Segment earnings$ 287$ 291$ 284
International      
Premiums and fees:      
Health Care$ 1,464$ 1,037$ 884
Supplemental Health, Life, and Accident   1,526  1,231  998
Total  2,990  2,268  1,882
Other revenues  17  25  18
Net investment income  96  82  69
Segment revenues$ 3,103$ 2,375$ 1,969
Income taxes$ 100$ 93$ 35
Equity in income of investees$ 8$ 10$ 8
Segment earnings$ 219$ 177$ 173
Run-off Reinsurance      
Premiums and fees and other revenues$ 20$ (133)$ (254)
Net investment income  103  114  113
Segment revenues$ 123$ (19)$ (141)
Income taxes (benefits)$ (99)$ (136)$ 93
Segment earnings (loss)$ (183)$ 26$ 185
Other Operations      
Premiums and fees and other revenues$ 169$ 174$ 176
Net investment income  400  404  407
Segment revenues$ 569$ 578$ 583
Income taxes$ 29$ 39$ 31
Segment earnings$ 89$ 85$ 86
Corporate      
Other revenues and eliminations$ (58)$ (62)$ (58)
Net investment income  6  1  -
Segment revenues$ (52)$ (61)$ (58)
Income tax benefits$ (101)$ (98)$ (91)
Segment loss$ (184)$ (211)$ (142)
Realized investment gains (losses)       
Realized investment gains (losses) $ 62$ 75$ (43)
Income taxes (benefits)  21  25  (17)
Realized investment gains (losses),      
net of taxes and noncontrolling interest$ 41$ 50$ (26)
Total      
Premiums and fees and other revenues$ 19,333$ 18,647$ 16,157
Mail order pharmacy revenues  1,447  1,420  1,282
Net investment income  1,146  1,105  1,014
Realized investment gains (losses)  62  75  (43)
Total revenues$ 21,988$ 21,247$ 18,410
Income taxes$ 615$ 519$ 559
Segment earnings$ 1,219$ 1,229$ 1,317
Realized investment gains (losses),      
net of taxes and noncontrolling interest$ 41$ 50$ (26)
Shareholders' income from continuing operations$ 1,260$ 1,279$ 1,291
Revenues By Product Table [Text Block]
(In millions)201120102009
Medical$ 14,568$ 14,253$ 12,089
Disability  1,280  1,162  1,063
Supplemental Health, Life, and Accident   3,103  2,839  2,748
Mail order pharmacy   1,447  1,420  1,282
Other  382  393  257
Total$ 20,780$ 20,067$ 17,439