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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