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Segment Information by Segment (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Segment Reporting Information [Line Items]        
Premiums $ 13,212 $ 11,584 $ 26,460 $ 22,667
Services 407 546 897 1,084
Total revenues - external customers 13,619 12,130 27,357 23,751
Investment income 113 92 208 183
Total revenues 13,732 12,222 27,565 23,934
Benefits 11,252 9,627 22,257 18,751
Operating costs 1,817 1,835 3,762 3,620
Depreciation and amortization 90 79 183 161
Total operating expenses 13,159 11,541 26,202 22,532
Income from operations 573 681 1,363 1,402
Gain on sale of business 267 0 267 0
Interest expense 47 35 93 70
Income before income taxes 793 646 1,537 1,332
Individual Medicare Advantage        
Segment Reporting Information [Line Items]        
Premiums 7,434 6,467 14,867 12,927
Group Medicare Advantage        
Segment Reporting Information [Line Items]        
Premiums 1,398 1,366 2,792 2,750
Medicare stand-alone PDP        
Segment Reporting Information [Line Items]        
Premiums 985 941 1,988 1,806
Total Medicare        
Segment Reporting Information [Line Items]        
Premiums 9,817 8,774 19,647 17,483
Fully-insured        
Segment Reporting Information [Line Items]        
Premiums 2,492 2,233 4,970 4,087
Specialty        
Segment Reporting Information [Line Items]        
Premiums 331 341 664 675
Medicaid and other        
Segment Reporting Information [Line Items]        
Premiums 572 236 1,179 422
Provider        
Segment Reporting Information [Line Items]        
Services 232 330 549 642
ASO and other        
Segment Reporting Information [Line Items]        
Services 168 191 334 396
Pharmacy        
Segment Reporting Information [Line Items]        
Services 7 25 14 46
Intersegment revenues        
Segment Reporting Information [Line Items]        
Total revenues (5,770) (4,678) (11,355) (9,024)
Intersegment revenues | Retail        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
Intersegment revenues | Group        
Segment Reporting Information [Line Items]        
Total revenues 22 16 44 35
Intersegment revenues | Healthcare Services        
Segment Reporting Information [Line Items]        
Total revenues 5,748 4,662 11,311 8,989
Intersegment revenues | Other Businesses        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
Intersegment revenues | Services        
Segment Reporting Information [Line Items]        
Total revenues (4,537) (3,740) (8,972) (7,240)
Intersegment revenues | Services | Retail        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
Intersegment revenues | Services | Group        
Segment Reporting Information [Line Items]        
Total revenues 22 16 44 35
Intersegment revenues | Services | Healthcare Services        
Segment Reporting Information [Line Items]        
Total revenues 4,515 3,724 8,928 7,205
Intersegment revenues | Services | Other Businesses        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
Intersegment revenues | Products        
Segment Reporting Information [Line Items]        
Total revenues (1,233) (938) (2,383) (1,784)
Intersegment revenues | Products | Retail        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
Intersegment revenues | Products | Group        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
Intersegment revenues | Products | Healthcare Services        
Segment Reporting Information [Line Items]        
Total revenues 1,233 938 2,383 1,784
Intersegment revenues | Products | Other Businesses        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
Operating Segments | Retail        
Segment Reporting Information [Line Items]        
Premiums 11,555 9,966 23,133 19,428
Services 2 13 6 27
Total revenues - external customers 11,557 9,979 23,139 19,455
Investment income 31 24 58 47
Total revenues 11,588 10,003 23,197 19,502
Benefits 10,068 8,495 20,004 16,575
Operating costs 1,213 1,071 2,467 2,081
Depreciation and amortization 47 37 91 77
Total operating expenses 11,328 9,603 22,562 18,733
Income from operations 260 400 635 769
Gain on sale of business 0   0  
Interest expense 0 0 0 0
Income before income taxes 260 400 635 769
Operating Segments | Group        
Segment Reporting Information [Line Items]        
Premiums 1,648 1,600 3,308 3,210
Services 174 181 343 374
Total revenues - external customers 1,822 1,781 3,651 3,584
Investment income 6 5 11 11
Total revenues 1,850 1,802 3,706 3,630
Benefits 1,341 1,262 2,567 2,429
Operating costs 444 484 897 977
Depreciation and amortization 22 26 45 50
Total operating expenses 1,807 1,772 3,509 3,456
Income from operations 43 30 197 174
Gain on sale of business 0   0  
Interest expense 0 0 0 0
Income before income taxes 43 30 197 174
Operating Segments | Healthcare Services        
Segment Reporting Information [Line Items]        
Premiums 0 0 0 0
Services 228 349 543 677
Total revenues - external customers 228 349 543 677
Investment income 0 0 0 0
Total revenues 5,976 5,011 11,854 9,666
Benefits 0 0 0 0
Operating costs 5,713 4,770 11,319 9,204
Depreciation and amortization 40 35 82 71
Total operating expenses 5,753 4,805 11,401 9,275
Income from operations 223 206 453 391
Gain on sale of business 0   0  
Interest expense 0 0 0 0
Income before income taxes 223 206 453 391
Operating Segments | Other Businesses        
Segment Reporting Information [Line Items]        
Premiums 9 18 19 29
Services 3 3 5 6
Total revenues - external customers 12 21 24 35
Investment income 22 15 37 30
Total revenues 34 36 61 65
Benefits 21 25 44 49
Operating costs 4 5 7 9
Depreciation and amortization 0 1 0 2
Total operating expenses 25 31 51 60
Income from operations 9 5 10 5
Gain on sale of business 0   0  
Interest expense 0 0 0 0
Income before income taxes 9 5 10 5
Operating Segments | Individual Medicare Advantage | Retail        
Segment Reporting Information [Line Items]        
Premiums 7,434 6,467 14,867 12,927
Operating Segments | Individual Medicare Advantage | Group        
Segment Reporting Information [Line Items]        
Premiums 0 0 0 0
Operating Segments | Individual Medicare Advantage | Healthcare Services        
Segment Reporting Information [Line Items]        
Premiums 0 0 0 0
Operating Segments | Individual Medicare Advantage | Other Businesses        
Segment Reporting Information [Line Items]        
Premiums 0 0 0 0
Operating Segments | Group Medicare Advantage | Retail        
Segment Reporting Information [Line Items]        
Premiums 1,398 1,366 2,792 2,750
Operating Segments | Group Medicare Advantage | Group        
Segment Reporting Information [Line Items]        
Premiums 0 0 0 0
Operating Segments | Group Medicare Advantage | Healthcare Services        
Segment Reporting Information [Line Items]        
Premiums 0 0 0 0
Operating Segments | Group Medicare Advantage | Other Businesses        
Segment Reporting Information [Line Items]        
Premiums 0 0 0 0
Operating Segments | Medicare stand-alone PDP | Retail        
Segment Reporting Information [Line Items]        
Premiums 985 941 1,988 1,806
Operating Segments | Medicare stand-alone PDP | Group        
Segment Reporting Information [Line Items]        
Premiums 0 0 0 0
Operating Segments | Medicare stand-alone PDP | Healthcare Services        
Segment Reporting Information [Line Items]        
Premiums 0 0 0 0
Operating Segments | Medicare stand-alone PDP | Other Businesses        
Segment Reporting Information [Line Items]        
Premiums 0 0 0 0
Operating Segments | Total Medicare | Retail        
Segment Reporting Information [Line Items]        
Premiums 9,817 8,774 19,647 17,483
Operating Segments | Total Medicare | Group        
Segment Reporting Information [Line Items]        
Premiums 0 0 0 0
Operating Segments | Total Medicare | Healthcare Services        
Segment Reporting Information [Line Items]        
Premiums 0 0 0 0
Operating Segments | Total Medicare | Other Businesses        
Segment Reporting Information [Line Items]        
Premiums 0 0 0 0
Operating Segments | Fully-insured | Retail        
Segment Reporting Information [Line Items]        
Premiums 1,113 912 2,207 1,437
Operating Segments | Fully-insured | Group        
Segment Reporting Information [Line Items]        
Premiums 1,379 1,321 2,763 2,650
Operating Segments | Fully-insured | Healthcare Services        
Segment Reporting Information [Line Items]        
Premiums 0 0 0 0
Operating Segments | Fully-insured | Other Businesses        
Segment Reporting Information [Line Items]        
Premiums 0 0 0 0
Operating Segments | Specialty | Retail        
Segment Reporting Information [Line Items]        
Premiums 66 66 129 125
Operating Segments | Specialty | Group        
Segment Reporting Information [Line Items]        
Premiums 265 275 535 550
Operating Segments | Specialty | Healthcare Services        
Segment Reporting Information [Line Items]        
Premiums 0 0 0 0
Operating Segments | Specialty | Other Businesses        
Segment Reporting Information [Line Items]        
Premiums 0 0 0 0
Operating Segments | Medicaid and other | Retail        
Segment Reporting Information [Line Items]        
Premiums 559 214 1,150 383
Operating Segments | Medicaid and other | Group        
Segment Reporting Information [Line Items]        
Premiums 4 4 10 10
Operating Segments | Medicaid and other | Healthcare Services        
Segment Reporting Information [Line Items]        
Premiums 0 0 0 0
Operating Segments | Medicaid and other | Other Businesses        
Segment Reporting Information [Line Items]        
Premiums 9 18 19 29
Operating Segments | Provider | Retail        
Segment Reporting Information [Line Items]        
Services 0 0 0 0
Operating Segments | Provider | Group        
Segment Reporting Information [Line Items]        
Services 11 6 20 11
Operating Segments | Provider | Healthcare Services        
Segment Reporting Information [Line Items]        
Services 221 324 529 631
Operating Segments | Provider | Other Businesses        
Segment Reporting Information [Line Items]        
Services 0 0 0 0
Operating Segments | ASO and other | Retail        
Segment Reporting Information [Line Items]        
Services 2 13 6 27
Operating Segments | ASO and other | Group        
Segment Reporting Information [Line Items]        
Services 163 175 323 363
Operating Segments | ASO and other | Healthcare Services        
Segment Reporting Information [Line Items]        
Services 0 0 0 0
Operating Segments | ASO and other | Other Businesses        
Segment Reporting Information [Line Items]        
Services 3 3 5 6
Operating Segments | Pharmacy | Retail        
Segment Reporting Information [Line Items]        
Services 0 0 0 0
Operating Segments | Pharmacy | Group        
Segment Reporting Information [Line Items]        
Services 0 0 0 0
Operating Segments | Pharmacy | Healthcare Services        
Segment Reporting Information [Line Items]        
Services 7 25 14 46
Operating Segments | Pharmacy | Other Businesses        
Segment Reporting Information [Line Items]        
Services 0 0 0 0
Eliminations/Corporate        
Segment Reporting Information [Line Items]        
Premiums 0 0 0 0
Services 0 0 0 0
Total revenues - external customers 0 0 0 0
Investment income 54 48 102 95
Total revenues (5,716) (4,630) (11,253) (8,929)
Benefits (178) (155) (358) (302)
Operating costs (5,557) (4,495) (10,928) (8,651)
Depreciation and amortization (19) (20) (35) (39)
Total operating expenses (5,754) (4,670) (11,321) (8,992)
Income from operations 38 40 68 63
Gain on sale of business 267   267  
Interest expense 47 35 93 70
Income before income taxes 258 5 242 (7)
Eliminations/Corporate | Individual Medicare Advantage        
Segment Reporting Information [Line Items]        
Premiums 0 0 0 0
Eliminations/Corporate | Group Medicare Advantage        
Segment Reporting Information [Line Items]        
Premiums 0 0 0 0
Eliminations/Corporate | Medicare stand-alone PDP        
Segment Reporting Information [Line Items]        
Premiums 0 0 0 0
Eliminations/Corporate | Total Medicare        
Segment Reporting Information [Line Items]        
Premiums 0 0 0 0
Eliminations/Corporate | Fully-insured        
Segment Reporting Information [Line Items]        
Premiums 0 0 0 0
Eliminations/Corporate | Specialty        
Segment Reporting Information [Line Items]        
Premiums 0 0 0 0
Eliminations/Corporate | Medicaid and other        
Segment Reporting Information [Line Items]        
Premiums 0 0 0 0
Eliminations/Corporate | Provider        
Segment Reporting Information [Line Items]        
Services 0 0 0 0
Eliminations/Corporate | ASO and other        
Segment Reporting Information [Line Items]        
Services 0 0 0 0
Eliminations/Corporate | Pharmacy        
Segment Reporting Information [Line Items]        
Services $ 0 $ 0 $ 0 $ 0