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Segment Information (Tables)
 12 Months Ended
Dec. 31, 2017
Segment Information [Abstract]  
Special item charges
(In millions)
Description of Special Item and Financial Statement Line Item(s)After-taxBefore-tax
Year ended December 31, 2017
Charges associated with U.S. tax reform
- Other operating expenses (see Note 20 for details)$(36)$(56)
- Tax expense (see Note 20 for details)232-
Total charges associated with U.S. tax reform$196$(56)
Debt extinguishment costs (Other operating expenses, see Note 5 for details)$209$321
Long-term care guaranty fund assessment (Other operating expenses, see Note 21(D) for details)$83$129
Transaction-related costs (Other operating expenses, see Note 3 for details)$33$126
Year ended December 31, 2016
Transaction-related costs (Other operating expenses, see Note 3 for details)$147$166
Risk corridor allowance (Other operating expenses, see page ##EndofNotesPage in this Note for details)$80$124
Charges associated with litigation matters (Other operating expenses, see Note 21(E) for a discussion of litigation charges)$25$40
Year ended December 31, 2015
Debt extinguishment costs (Other operating expenses, see Note 5 for details)$65$100
Transaction-related costs (Other operating expenses, see Note 3 for details)$57$66
Summarized segment financial information
(In millions)Global Health CareGlobal Supplemental BenefitsGroup Disability and LifeOther OperationsCorporateTotal
2017
Premiums$24,538 $ 3,684 $ 3,985 $ 112 $ (12) $ 32,307
Fees and other revenues (1)4,7226610610(37)4,867
Net investment income378122350346301,226
Mail order pharmacy revenues2,979----2,979
Total operating revenues32,6173,8724,441468(19)41,379
Net realized investment gains (losses)1363274(5)-237
Total revenues32,7533,9044,515463(19)41,616
Depreciation and amortization477543014566
Total benefits and expenses29,4403,4074,04431680338,010
Income (loss) before income taxes3,313497471147(822)3,606
Income taxes (benefits) and net loss attributable to noncontrolling interests1,031195113222(192)1,369
Shareholders' net income (loss) by segment2,282302358(75)(630)2,237
After-tax adjustments to reconcile to adjusted income from operations
Net realized investment (gains) losses(88)(24)(49)41(156)
Amortization of other acquired intangible assets, net4818---66
Special items
U.S. tax reform(137)73(39)138161196
Debt extinguishment costs----209209
Long-term care guaranty fund assessment 68-15--83
Transaction-related costs----3333
Adjusted income (loss) from operations$2,173$369$285$67$(226)$2,668
(In millions)Global Health CareGlobal Supplemental BenefitsGroup Disability and LifeOther OperationsCorporateTotal
2016
Premiums$23,295$3,226$4,002$103$-$30,626
Fees and other revenues (1)4,623499811(21)4,760
Net investment income315110343358211,147
Mail order pharmacy revenues2,966----2,966
Total operating revenues31,1993,3854,443472-39,499
Net realized investment gains119(5)59(5)1169
Total revenues31,3183,3804,502467139,668
Depreciation and amortization526542811610
Total benefits and expenses28,4673,0524,27336952836,689
Income (loss) before taxes2,85132822998(527)2,979
Income taxes (benefits) and net loss attributable to noncontrolling interests1,100606530(143)1,112
Shareholders' net income (loss) by segment1,75126816468(384)1,867
After-tax adjustments to reconcile to adjusted income from operations
Net realized investment (gains)(78)6(39)2-(109)
Amortization of other acquired intangible assets, net7420---94
Special items
Transaction-related costs----147147
Risk corridor allowance80----80
Charges associated with litigation matters25----25
Adjusted income (loss) from operations$1,852 $ 294 $ 125 $ 70 $ (237) $ 2,104
(1) Includes the Company's share of the earnings of its joint ventures in China and India in the Global Supplemental Benefits segment.
(In millions)Global Health CareGlobal Supplemental BenefitsGroup Disability and LifeOther OperationsCorporateTotal
2015
Premiums$22,696$3,000$3,843$103$-$29,642
Fees and other revenues (1)4,357469113(19)4,488
Net investment income34010333736941,153
Mail order pharmacy revenues2,536----2,536
Total operating revenues29,9293,1494,271485(15)37,819
Net realized investment gains43-59-57
Total revenues29,9723,1494,276494(15)37,876
Depreciation and amortization526312611585
Total benefits and expenses27,0282,8493,79637450234,549
Income (loss) before taxes2,944300480120(517)3,327
Income taxes (benefits) and net income attributable to noncontrolling interests1,1503315240(142)1,233
Shareholders' net income (loss) by segment1,79426732880(375)2,094
After-tax adjustments to reconcile to adjusted income from operations
Net realized investment (gains)(30)(1)(4)(5)-(40)
Amortization of other acquired intangible assets, net (2)84(4)---80
Special items
Debt extinguishment costs----6565
Transaction-related costs----5757
Adjusted income (loss) from operations$1,848$262$324$75$(253)$2,256
(1) Includes the Company's share of the earnings of its joint ventures in China and India in the Global Supplemental Benefits segment.
(2) Includes a $23 million bargain purchase gain for a 2015 acquisition.
Revenue from external customers
(In millions)201720162015
Global Health Care premiums by product:
Guaranteed cost$6,245$4,610$4,761
Experience-rated2,7412,3832,329
Stop loss3,4833,0822,701
International health care1,9341,8591,834
Dental1,7911,5861,392
Medicare5,5346,6216,142
Medicaid1,0611,1461,102
Medicare Part D7641,1221,589
Other985886846
Total premiums24,53823,29522,696
Fees4,5034,3684,107
Total Global Health Care premiums and fees29,04127,66326,803
Disability2,0912,0451,899
Life, Accident and Supplemental Health5,7045,3005,054
Mail order pharmacy 2,9792,9662,536
Other338378374
Total$40,153$38,352$36,666
Foreign and U.S. revenues from external customers
(In millions)201720162015
United States $ 36,128 $ 34,672 $ 33,185
South Korea1,8921,6661,521
All other foreign countries2,1332,0141,960
Total$40,153$38,352$36,666