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Segment Information by Segment (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]                      
Premiums                 $ 52,409 $ 45,959 $ 38,829
Services                 1,406 2,164 2,109
Total revenues-external customers                 53,815 48,123 40,938
Total revenues $ 13,361 $ 13,363 $ 13,732 $ 13,833 $ 12,328 $ 12,238 $ 12,222 $ 11,712 54,289 48,500 41,313
Investment income                 474 377 375
Benefits                 44,269 38,166 32,564
Operating costs                 7,318 7,639 6,355
Depreciation and amortization                 355 333 333
Total operating expenses                 51,942 46,138 39,252
Income from operations                 2,347 2,362 2,061
Gain on sale of business                 270 0 0
Interest expense                 186 192 140
Income before income taxes $ 246 $ 648 $ 793 $ 744 $ 287 $ 551 $ 646 $ 686 2,431 2,170 1,921
Individual Medicare Advantage                      
Segment Reporting Information [Line Items]                      
Premiums                 29,526 25,782 22,481
Group Medicare Advantage                      
Segment Reporting Information [Line Items]                      
Premiums                 5,588 5,490 4,710
Medicare stand-alone PDP                      
Segment Reporting Information [Line Items]                      
Premiums                 3,846 3,404 3,033
Total Medicare                      
Segment Reporting Information [Line Items]                      
Premiums                 38,960 34,676 30,224
Fully-insured                      
Segment Reporting Information [Line Items]                      
Premiums                 9,736 8,604 6,277
Specialty                      
Segment Reporting Information [Line Items]                      
Premiums                 1,316 1,354 1,305
Medicaid and other                      
Segment Reporting Information [Line Items]                      
Premiums                 2,397 1,325 1,023
Provider                      
Segment Reporting Information [Line Items]                      
Services                 695 1,277 1,312
ASO and other                      
Segment Reporting Information [Line Items]                      
Services                 681 788 738
Pharmacy                      
Segment Reporting Information [Line Items]                      
Services                 30 99 59
Intersegment revenues                      
Segment Reporting Information [Line Items]                      
Total revenues                 (23,013) (18,925) (14,744)
Intersegment revenues | Retail                      
Segment Reporting Information [Line Items]                      
Total revenues                 0 0 0
Intersegment revenues | Group                      
Segment Reporting Information [Line Items]                      
Total revenues                 93 78 51
Intersegment revenues | Healthcare Services                      
Segment Reporting Information [Line Items]                      
Total revenues                 22,920 18,847 14,693
Intersegment revenues | Other Businesses                      
Segment Reporting Information [Line Items]                      
Total revenues                 0 0 0
Intersegment revenues | Services                      
Segment Reporting Information [Line Items]                      
Total revenues                 (18,090) (15,176) (11,941)
Intersegment revenues | Services | Retail                      
Segment Reporting Information [Line Items]                      
Total revenues                 0 0 0
Intersegment revenues | Services | Group                      
Segment Reporting Information [Line Items]                      
Total revenues                 93 78 51
Intersegment revenues | Services | Healthcare Services                      
Segment Reporting Information [Line Items]                      
Total revenues                 17,997 15,098 11,890
Intersegment revenues | Services | Other Businesses                      
Segment Reporting Information [Line Items]                      
Total revenues                 0 0 0
Intersegment revenues | Products                      
Segment Reporting Information [Line Items]                      
Total revenues                 (4,923) (3,749) (2,803)
Intersegment revenues | Products | Retail                      
Segment Reporting Information [Line Items]                      
Total revenues                 0 0 0
Intersegment revenues | Products | Group                      
Segment Reporting Information [Line Items]                      
Total revenues                 0 0 0
Intersegment revenues | Products | Healthcare Services                      
Segment Reporting Information [Line Items]                      
Total revenues                 4,923 3,749 2,803
Intersegment revenues | Products | Other Businesses                      
Segment Reporting Information [Line Items]                      
Total revenues                 0 0 0
Operating Segments | Retail                      
Segment Reporting Information [Line Items]                      
Premiums                 45,805 39,452 31,922
Services                 9 39 18
Total revenues-external customers                 45,814 39,491 31,940
Total revenues                 45,948 39,588 32,032
Investment income                 134 97 92
Benefits                 39,708 33,508 27,164
Operating costs                 5,118 4,576 3,232
Depreciation and amortization                 192 165 146
Total operating expenses                 45,018 38,249 30,542
Income from operations                 930 1,339 1,490
Gain on sale of business                 0    
Interest expense                 0 0 0
Income before income taxes                 930 1,339 1,490
Operating Segments | Group                      
Segment Reporting Information [Line Items]                      
Premiums                 6,569 6,456 6,237
Services                 698 763 735
Total revenues-external customers                 7,267 7,219 6,972
Total revenues                 7,386 7,320 7,047
Investment income                 26 23 24
Benefits                 5,266 5,130 4,847
Operating costs                 1,769 1,936 1,860
Depreciation and amortization                 93 103 100
Total operating expenses                 7,128 7,169 6,807
Income from operations                 258 151 240
Gain on sale of business                 0    
Interest expense                 0 0 0
Income before income taxes                 258 151 240
Operating Segments | Healthcare Services                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Services                 685 1,353 1,350
Total revenues-external customers                 685 1,353 1,350
Total revenues                 23,605 20,200 16,043
Investment income                 0 0 0
Benefits                 0 0 0
Operating costs                 22,481 19,307 15,372
Depreciation and amortization                 143 155 151
Total operating expenses                 22,624 19,462 15,523
Income from operations                 981 738 520
Gain on sale of business                 0    
Interest expense                 0 0 0
Income before income taxes                 981 738 520
Operating Segments | Other Businesses                      
Segment Reporting Information [Line Items]                      
Premiums                 35 51 670
Services                 14 9 6
Total revenues-external customers                 49 60 676
Total revenues                 125 120 735
Investment income                 76 60 59
Benefits                 87 102 962
Operating costs                 14 17 56
Depreciation and amortization                 0 0 6
Total operating expenses                 101 119 1,024
Income from operations                 24 1 (289)
Gain on sale of business                 0    
Interest expense                 0 0 0
Income before income taxes                 24 1 (289)
Operating Segments | Individual Medicare Advantage | Retail                      
Segment Reporting Information [Line Items]                      
Premiums                 29,526 25,782 22,481
Operating Segments | Individual Medicare Advantage | Group                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Operating Segments | Individual Medicare Advantage | Healthcare Services                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Operating Segments | Individual Medicare Advantage | Other Businesses                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Operating Segments | Group Medicare Advantage | Retail                      
Segment Reporting Information [Line Items]                      
Premiums                 5,588 5,490 4,710
Operating Segments | Group Medicare Advantage | Group                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Operating Segments | Group Medicare Advantage | Healthcare Services                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Operating Segments | Group Medicare Advantage | Other Businesses                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Operating Segments | Medicare stand-alone PDP | Retail                      
Segment Reporting Information [Line Items]                      
Premiums                 3,846 3,404 3,033
Operating Segments | Medicare stand-alone PDP | Group                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Operating Segments | Medicare stand-alone PDP | Healthcare Services                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Operating Segments | Medicare stand-alone PDP | Other Businesses                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Operating Segments | Total Medicare | Retail                      
Segment Reporting Information [Line Items]                      
Premiums                 38,960 34,676 30,224
Operating Segments | Total Medicare | Group                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Operating Segments | Total Medicare | Healthcare Services                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Operating Segments | Total Medicare | Other Businesses                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Operating Segments | Fully-insured | Retail                      
Segment Reporting Information [Line Items]                      
Premiums                 4,243 3,265 1,160
Operating Segments | Fully-insured | Group                      
Segment Reporting Information [Line Items]                      
Premiums                 5,493 5,339 5,117
Operating Segments | Fully-insured | Healthcare Services                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Operating Segments | Fully-insured | Other Businesses                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Operating Segments | Specialty | Retail                      
Segment Reporting Information [Line Items]                      
Premiums                 261 256 210
Operating Segments | Specialty | Group                      
Segment Reporting Information [Line Items]                      
Premiums                 1,055 1,098 1,095
Operating Segments | Specialty | Healthcare Services                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Operating Segments | Specialty | Other Businesses                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Operating Segments | Medicaid and other | Retail                      
Segment Reporting Information [Line Items]                      
Premiums                 2,341 1,255 328
Operating Segments | Medicaid and other | Group                      
Segment Reporting Information [Line Items]                      
Premiums                 21 19 25
Operating Segments | Medicaid and other | Healthcare Services                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Operating Segments | Medicaid and other | Other Businesses                      
Segment Reporting Information [Line Items]                      
Premiums                 35 51 670
Operating Segments | Provider | Retail                      
Segment Reporting Information [Line Items]                      
Services                 0 0 0
Operating Segments | Provider | Group                      
Segment Reporting Information [Line Items]                      
Services                 40 23 21
Operating Segments | Provider | Healthcare Services                      
Segment Reporting Information [Line Items]                      
Services                 655 1,254 1,291
Operating Segments | Provider | Other Businesses                      
Segment Reporting Information [Line Items]                      
Services                 0 0 0
Operating Segments | ASO and other | Retail                      
Segment Reporting Information [Line Items]                      
Services                 9 39 18
Operating Segments | ASO and other | Group                      
Segment Reporting Information [Line Items]                      
Services                 658 740 714
Operating Segments | ASO and other | Healthcare Services                      
Segment Reporting Information [Line Items]                      
Services                 0 0 0
Operating Segments | ASO and other | Other Businesses                      
Segment Reporting Information [Line Items]                      
Services                 14 9 6
Operating Segments | Pharmacy | Retail                      
Segment Reporting Information [Line Items]                      
Services                 0 0 0
Operating Segments | Pharmacy | Group                      
Segment Reporting Information [Line Items]                      
Services                 0 0 0
Operating Segments | Pharmacy | Healthcare Services                      
Segment Reporting Information [Line Items]                      
Services                 30 99 59
Operating Segments | Pharmacy | Other Businesses                      
Segment Reporting Information [Line Items]                      
Services                 0 0 0
Eliminations/Corporate                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Services                 0 0 0
Total revenues-external customers                 0 0 0
Total revenues                 (22,775) (18,728) (14,544)
Investment income                 238 197 200
Benefits                 (792) (574) (409)
Operating costs                 (22,064) (18,197) (14,165)
Depreciation and amortization                 (73) (90) (70)
Total operating expenses                 (22,929) (18,861) (14,644)
Income from operations                 154 133 100
Gain on sale of business                 270    
Interest expense                 186 192 140
Income before income taxes                 238 (59) (40)
Eliminations/Corporate | Individual Medicare Advantage                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Eliminations/Corporate | Group Medicare Advantage                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Eliminations/Corporate | Medicare stand-alone PDP                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Eliminations/Corporate | Total Medicare                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Eliminations/Corporate | Fully-insured                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Eliminations/Corporate | Specialty                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Eliminations/Corporate | Medicaid and other                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Eliminations/Corporate | Provider                      
Segment Reporting Information [Line Items]                      
Services                 0 0 0
Eliminations/Corporate | ASO and other                      
Segment Reporting Information [Line Items]                      
Services                 0 0 0
Eliminations/Corporate | Pharmacy                      
Segment Reporting Information [Line Items]                      
Services                 $ 0 $ 0 $ 0