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Segment Information by Segment (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Segment Reporting Information [Line Items] |  |
Premiums | $ 13,440 | $ 13,248
Services | 260 | 490
Total revenues - external customers | 13,700 | 13,738
Investment income | 100 | 95
Total revenues | 13,800 | 13,833
Benefits | 11,397 | 11,005
Operating costs | 1,768 | 1,945
Depreciation and amortization | 88 | 93
Total operating expenses | 13,253 | 13,043
Income from operations | 547 | 790
Interest expense | 47 | 46
Income before income taxes | 500 | 744
Individual Medicare Advantage |  |
Segment Reporting Information [Line Items] |  |
Premiums | 8,027 | 7,433
Group Medicare Advantage |  |
Segment Reporting Information [Line Items] |  |
Premiums | 1,077 | 1,394
Medicare stand-alone PDP |  |
Segment Reporting Information [Line Items] |  |
Premiums | 1,039 | 1,003
Total Medicare |  |
Segment Reporting Information [Line Items] |  |
Premiums | 10,143 | 9,830
Fully-insured |  |
Segment Reporting Information [Line Items] |  |
Premiums | 2,334 | 2,478
Specialty |  |
Segment Reporting Information [Line Items] |  |
Premiums | 318 | 333
Medicaid and other |  |
Segment Reporting Information [Line Items] |  |
Premiums | 645 | 607
Provider |  |
Segment Reporting Information [Line Items] |  |
Services | 71 | 317
ASO and other |  |
Segment Reporting Information [Line Items] |  |
Services | 182 | 166
Pharmacy |  |
Segment Reporting Information [Line Items] |  |
Services | 7 | 7
Intersegment revenues |  |
Segment Reporting Information [Line Items] |  |
Total revenues | (6,135) | (5,539)
Intersegment revenues | Retail |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 0 | 0
Intersegment revenues | Group |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 21 | 22
Intersegment revenues | Healthcare Services |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 6,114 | 5,517
Intersegment revenues | Other Businesses |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 0 | 0
Intersegment revenues | Services |  |
Segment Reporting Information [Line Items] |  |
Total revenues | (4,775) | (4,389)
Intersegment revenues | Services | Retail |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 0 | 0
Intersegment revenues | Services | Group |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 21 | 22
Intersegment revenues | Services | Healthcare Services |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 4,754 | 4,367
Intersegment revenues | Services | Other Businesses |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 0 | 0
Intersegment revenues | Products |  |
Segment Reporting Information [Line Items] |  |
Total revenues | (1,360) | (1,150)
Intersegment revenues | Products | Retail |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 0 | 0
Intersegment revenues | Products | Group |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 0 | 0
Intersegment revenues | Products | Healthcare Services |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 1,360 | 1,150
Intersegment revenues | Products | Other Businesses |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 0 | 0
Operating Segments | Retail |  |
Segment Reporting Information [Line Items] |  |
Premiums | 11,835 | 11,578
Services | 2 | 4
Total revenues - external customers | 11,837 | 11,582
Investment income | 27 | 27
Total revenues | 11,864 | 11,609
Benefits | 10,378 | 9,936
Operating costs | 1,276 | 1,254
Depreciation and amortization | 56 | 44
Total operating expenses | 11,710 | 11,234
Income from operations | 154 | 375
Interest expense | 0 | 0
Income before income taxes | 154 | 375
Operating Segments | Group |  |
Segment Reporting Information [Line Items] |  |
Premiums | 1,595 | 1,660
Services | 190 | 169
Total revenues - external customers | 1,785 | 1,829
Investment income | 5 | 5
Total revenues | 1,811 | 1,856
Benefits | 1,193 | 1,226
Operating costs | 436 | 453
Depreciation and amortization | 24 | 23
Total operating expenses | 1,653 | 1,702
Income from operations | 158 | 154
Interest expense | 0 | 0
Income before income taxes | 158 | 154
Operating Segments | Healthcare Services |  |
Segment Reporting Information [Line Items] |  |
Premiums | 0 | 0
Services | 65 | 315
Total revenues - external customers | 65 | 315
Investment income | 7 | 0
Total revenues | 6,186 | 5,832
Benefits | 0 | 0
Operating costs | 5,913 | 5,560
Depreciation and amortization | 32 | 42
Total operating expenses | 5,945 | 5,602
Income from operations | 241 | 230
Interest expense | 0 | 0
Income before income taxes | 241 | 230
Operating Segments | Other Businesses |  |
Segment Reporting Information [Line Items] |  |
Premiums | 10 | 10
Services | 3 | 2
Total revenues - external customers | 13 | 12
Investment income | 15 | 15
Total revenues | 28 | 27
Benefits | 25 | 23
Operating costs | 4 | 3
Depreciation and amortization | 0 | 0
Total operating expenses | 29 | 26
Income from operations | (1) | 1
Interest expense | 0 | 0
Income before income taxes | (1) | 1
Operating Segments | Individual Medicare Advantage | Retail |  |
Segment Reporting Information [Line Items] |  |
Premiums | 8,027 | 7,433
Operating Segments | Individual Medicare Advantage | Group |  |
Segment Reporting Information [Line Items] |  |
Premiums | 0 | 0
Operating Segments | Individual Medicare Advantage | Healthcare Services |  |
Segment Reporting Information [Line Items] |  |
Premiums | 0 | 0
Operating Segments | Individual Medicare Advantage | Other Businesses |  |
Segment Reporting Information [Line Items] |  |
Premiums | 0 | 0
Operating Segments | Group Medicare Advantage | Retail |  |
Segment Reporting Information [Line Items] |  |
Premiums | 1,077 | 1,394
Operating Segments | Group Medicare Advantage | Group |  |
Segment Reporting Information [Line Items] |  |
Premiums | 0 | 0
Operating Segments | Group Medicare Advantage | Healthcare Services |  |
Segment Reporting Information [Line Items] |  |
Premiums | 0 | 0
Operating Segments | Group Medicare Advantage | Other Businesses |  |
Segment Reporting Information [Line Items] |  |
Premiums | 0 | 0
Operating Segments | Medicare stand-alone PDP | Retail |  |
Segment Reporting Information [Line Items] |  |
Premiums | 1,039 | 1,003
Operating Segments | Medicare stand-alone PDP | Group |  |
Segment Reporting Information [Line Items] |  |
Premiums | 0 | 0
Operating Segments | Medicare stand-alone PDP | Healthcare Services |  |
Segment Reporting Information [Line Items] |  |
Premiums | 0 | 0
Operating Segments | Medicare stand-alone PDP | Other Businesses |  |
Segment Reporting Information [Line Items] |  |
Premiums | 0 | 0
Operating Segments | Total Medicare | Retail |  |
Segment Reporting Information [Line Items] |  |
Premiums | 10,143 | 9,830
Operating Segments | Total Medicare | Group |  |
Segment Reporting Information [Line Items] |  |
Premiums | 0 | 0
Operating Segments | Total Medicare | Healthcare Services |  |
Segment Reporting Information [Line Items] |  |
Premiums | 0 | 0
Operating Segments | Total Medicare | Other Businesses |  |
Segment Reporting Information [Line Items] |  |
Premiums | 0 | 0
Operating Segments | Fully-insured | Retail |  |
Segment Reporting Information [Line Items] |  |
Premiums | 997 | 1,094
Operating Segments | Fully-insured | Group |  |
Segment Reporting Information [Line Items] |  |
Premiums | 1,337 | 1,384
Operating Segments | Fully-insured | Healthcare Services |  |
Segment Reporting Information [Line Items] |  |
Premiums | 0 | 0
Operating Segments | Fully-insured | Other Businesses |  |
Segment Reporting Information [Line Items] |  |
Premiums | 0 | 0
Operating Segments | Specialty | Retail |  |
Segment Reporting Information [Line Items] |  |
Premiums | 65 | 63
Operating Segments | Specialty | Group |  |
Segment Reporting Information [Line Items] |  |
Premiums | 253 | 270
Operating Segments | Specialty | Healthcare Services |  |
Segment Reporting Information [Line Items] |  |
Premiums | 0 | 0
Operating Segments | Specialty | Other Businesses |  |
Segment Reporting Information [Line Items] |  |
Premiums | 0 | 0
Operating Segments | Medicaid and other | Retail |  |
Segment Reporting Information [Line Items] |  |
Premiums | 630 | 591
Operating Segments | Medicaid and other | Group |  |
Segment Reporting Information [Line Items] |  |
Premiums | 5 | 6
Operating Segments | Medicaid and other | Healthcare Services |  |
Segment Reporting Information [Line Items] |  |
Premiums | 0 | 0
Operating Segments | Medicaid and other | Other Businesses |  |
Segment Reporting Information [Line Items] |  |
Premiums | 10 | 10
Operating Segments | Provider | Retail |  |
Segment Reporting Information [Line Items] |  |
Services | 0 | 0
Operating Segments | Provider | Group |  |
Segment Reporting Information [Line Items] |  |
Services | 13 | 9
Operating Segments | Provider | Healthcare Services |  |
Segment Reporting Information [Line Items] |  |
Services | 58 | 308
Operating Segments | Provider | Other Businesses |  |
Segment Reporting Information [Line Items] |  |
Services | 0 | 0
Operating Segments | ASO and other | Retail |  |
Segment Reporting Information [Line Items] |  |
Services | 2 | 4
Operating Segments | ASO and other | Group |  |
Segment Reporting Information [Line Items] |  |
Services | 177 | 160
Operating Segments | ASO and other | Healthcare Services |  |
Segment Reporting Information [Line Items] |  |
Services | 0 | 0
Operating Segments | ASO and other | Other Businesses |  |
Segment Reporting Information [Line Items] |  |
Services | 3 | 2
Operating Segments | Pharmacy | Retail |  |
Segment Reporting Information [Line Items] |  |
Services | 0 | 0
Operating Segments | Pharmacy | Group |  |
Segment Reporting Information [Line Items] |  |
Services | 0 | 0
Operating Segments | Pharmacy | Healthcare Services |  |
Segment Reporting Information [Line Items] |  |
Services | 7 | 7
Operating Segments | Pharmacy | Other Businesses |  |
Segment Reporting Information [Line Items] |  |
Services | 0 | 0
Eliminations/Corporate |  |
Segment Reporting Information [Line Items] |  |
Premiums | 0 | 0
Services | 0 | 0
Total revenues - external customers | 0 | 0
Investment income | 46 | 48
Total revenues | (6,089) | (5,491)
Benefits | (199) | (180)
Operating costs | (5,861) | (5,325)
Depreciation and amortization | (24) | (16)
Total operating expenses | (6,084) | (5,521)
Income from operations | (5) | 30
Interest expense | 47 | 46
Income before income taxes | (52) | (16)
Eliminations/Corporate | Individual Medicare Advantage |  |
Segment Reporting Information [Line Items] |  |
Premiums | 0 | 0
Eliminations/Corporate | Group Medicare Advantage |  |
Segment Reporting Information [Line Items] |  |
Premiums | 0 | 0
Eliminations/Corporate | Medicare stand-alone PDP |  |
Segment Reporting Information [Line Items] |  |
Premiums | 0 | 0
Eliminations/Corporate | Total Medicare |  |
Segment Reporting Information [Line Items] |  |
Premiums | 0 | 0
Eliminations/Corporate | Fully-insured |  |
Segment Reporting Information [Line Items] |  |
Premiums | 0 | 0
Eliminations/Corporate | Specialty |  |
Segment Reporting Information [Line Items] |  |
Premiums | 0 | 0
Eliminations/Corporate | Medicaid and other |  |
Segment Reporting Information [Line Items] |  |
Premiums | 0 | 0
Eliminations/Corporate | Provider |  |
Segment Reporting Information [Line Items] |  |
Services | 0 | 0
Eliminations/Corporate | ASO and other |  |
Segment Reporting Information [Line Items] |  |
Services | 0 | 0
Eliminations/Corporate | Pharmacy |  |
Segment Reporting Information [Line Items] |  |
Services | $ 0 | $ 0

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