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Segment Information by Segment (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]      
Premiums $ 45,959 $ 38,829 $ 37,009
Services 2,164 2,109 1,726
Total revenues-external customers 48,123 40,938 38,735
Total revenues 48,500 41,313 39,126
Investment income 377 375 391
Benefits 38,166 32,564 30,985
Operating costs 7,639 6,355 5,830
Depreciation and amortization 333 333 295
Total operating expenses 46,138 39,252 37,110
Income from operations 2,362 2,061 2,016
Interest expense 192 140 105
Income before income taxes 2,170 1,921 1,911
Medicare Advantage      
Segment Reporting Information [Line Items]      
Premiums 25,782 22,481 20,788
Group Medicare Advantage      
Segment Reporting Information [Line Items]      
Premiums 5,490 4,710 4,064
Medicare Stand Alone Prescription Drug Plan      
Segment Reporting Information [Line Items]      
Premiums 3,404 3,033 2,861
Medicare      
Segment Reporting Information [Line Items]      
Premiums 34,676 30,224 27,713
Fully-Insured      
Segment Reporting Information [Line Items]      
Premiums 8,604 6,277 6,000
Specialty      
Segment Reporting Information [Line Items]      
Premiums 1,354 1,305 1,241
Military Services      
Segment Reporting Information [Line Items]      
Premiums 19 25 1,017
Medicaid And Other      
Segment Reporting Information [Line Items]      
Premiums 1,306 998 1,038
Provider      
Segment Reporting Information [Line Items]      
Services 1,277 1,312 1,050
Aso And Other      
Segment Reporting Information [Line Items]      
Services 788 738 660
Pharmacy      
Segment Reporting Information [Line Items]      
Services 99 59 16
Intersegment revenues      
Segment Reporting Information [Line Items]      
Total revenues (18,925) (14,744) (12,120)
Intersegment revenues | Retail      
Segment Reporting Information [Line Items]      
Total revenues 0 0 2
Intersegment revenues | Group      
Segment Reporting Information [Line Items]      
Total revenues 78 51 31
Intersegment revenues | Healthcare Services      
Segment Reporting Information [Line Items]      
Total revenues 18,847 14,693 12,087
Intersegment revenues | Other Businesses      
Segment Reporting Information [Line Items]      
Total revenues 0 0 0
Intersegment revenues | Services      
Segment Reporting Information [Line Items]      
Total revenues (15,176) (11,941) (9,778)
Intersegment revenues | Services | Retail      
Segment Reporting Information [Line Items]      
Total revenues 0 0 2
Intersegment revenues | Services | Group      
Segment Reporting Information [Line Items]      
Total revenues 78 51 31
Intersegment revenues | Services | Healthcare Services      
Segment Reporting Information [Line Items]      
Total revenues 15,098 11,890 9,745
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 (3,749) (2,803) (2,342)
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 3,749 2,803 2,342
Intersegment revenues | Products | Other Businesses      
Segment Reporting Information [Line Items]      
Total revenues 0 0 0
Operating Segments | Retail      
Segment Reporting Information [Line Items]      
Premiums 39,452 31,922 29,073
Services 39 18 36
Total revenues-external customers 39,491 31,940 29,109
Total revenues 39,588 32,032 29,207
Investment income 97 92 96
Benefits 33,508 27,164 24,751
Operating costs 4,576 3,232 2,997
Depreciation and amortization 165 146 142
Total operating expenses 38,249 30,542 27,890
Income from operations 1,339 1,490 1,317
Interest expense 0 0 0
Income before income taxes 1,339 1,490 1,317
Operating Segments | Group      
Segment Reporting Information [Line Items]      
Premiums 6,456 6,237 7,083
Services 763 735 631
Total revenues-external customers 7,219 6,972 7,714
Total revenues 7,320 7,047 7,770
Investment income 23 24 25
Benefits 5,130 4,847 5,676
Operating costs 1,936 1,860 1,837
Depreciation and amortization 103 100 86
Total operating expenses 7,169 6,807 7,599
Income from operations 151 240 171
Interest expense 0 0 0
Income before income taxes 151 240 171
Operating Segments | Healthcare Services      
Segment Reporting Information [Line Items]      
Premiums 0 0 0
Services 1,353 1,350 1,053
Total revenues-external customers 1,353 1,350 1,053
Total revenues 20,200 16,043 13,140
Investment income 0 0 0
Benefits 0 0 0
Operating costs 19,307 15,372 12,628
Depreciation and amortization 155 151 89
Total operating expenses 19,462 15,523 12,717
Income from operations 738 520 423
Interest expense 0 0 0
Income before income taxes 738 520 423
Operating Segments | Other Businesses      
Segment Reporting Information [Line Items]      
Premiums 51 670 853
Services 9 6 6
Total revenues-external customers 60 676 859
Total revenues 120 735 917
Investment income 60 59 58
Benefits 102 962 894
Operating costs 17 56 46
Depreciation and amortization 0 6 5
Total operating expenses 119 1,024 945
Income from operations 1 (289) (28)
Interest expense 0 0 0
Income before income taxes 1 (289) (28)
Operating Segments | Medicare Advantage | Retail      
Segment Reporting Information [Line Items]      
Premiums 25,782 22,481 20,788
Operating Segments | Medicare Advantage | Group      
Segment Reporting Information [Line Items]      
Premiums 0 0 0
Operating Segments | Medicare Advantage | Healthcare Services      
Segment Reporting Information [Line Items]      
Premiums 0 0 0
Operating Segments | 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 5,490 4,710 4,064
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 Prescription Drug Plan | Retail      
Segment Reporting Information [Line Items]      
Premiums 3,404 3,033 2,861
Operating Segments | Medicare Stand Alone Prescription Drug Plan | Group      
Segment Reporting Information [Line Items]      
Premiums 0 0 0
Operating Segments | Medicare Stand Alone Prescription Drug Plan | Healthcare Services      
Segment Reporting Information [Line Items]      
Premiums 0 0 0
Operating Segments | Medicare Stand Alone Prescription Drug Plan | Other Businesses      
Segment Reporting Information [Line Items]      
Premiums 0 0 0
Operating Segments | Medicare | Retail      
Segment Reporting Information [Line Items]      
Premiums 34,676 30,224 27,713
Operating Segments | Medicare | Group      
Segment Reporting Information [Line Items]      
Premiums 0 0 0
Operating Segments | Medicare | Healthcare Services      
Segment Reporting Information [Line Items]      
Premiums 0 0 0
Operating Segments | Medicare | Other Businesses      
Segment Reporting Information [Line Items]      
Premiums 0 0 0
Operating Segments | Fully-Insured | Retail      
Segment Reporting Information [Line Items]      
Premiums 3,265 1,160 1,004
Operating Segments | Fully-Insured | Group      
Segment Reporting Information [Line Items]      
Premiums 5,339 5,117 4,996
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 256 210 171
Operating Segments | Specialty | Group      
Segment Reporting Information [Line Items]      
Premiums 1,098 1,095 1,070
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 | Military Services | Retail      
Segment Reporting Information [Line Items]      
Premiums 0 0 0
Operating Segments | Military Services | Group      
Segment Reporting Information [Line Items]      
Premiums 19 25 1,017
Operating Segments | Military Services | Healthcare Services      
Segment Reporting Information [Line Items]      
Premiums 0 0 0
Operating Segments | Military Services | Other Businesses      
Segment Reporting Information [Line Items]      
Premiums 0 0 0
Operating Segments | Medicaid And Other | Retail      
Segment Reporting Information [Line Items]      
Premiums 1,255 328 185
Operating Segments | Medicaid And Other | Group      
Segment Reporting Information [Line Items]      
Premiums 0 0 0
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 51 670 853
Operating Segments | Provider | Retail      
Segment Reporting Information [Line Items]      
Services 0 0 0
Operating Segments | Provider | Group      
Segment Reporting Information [Line Items]      
Services 23 21 13
Operating Segments | Provider | Healthcare Services      
Segment Reporting Information [Line Items]      
Services 1,254 1,291 1,037
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 39 18 36
Operating Segments | Aso And Other | Group      
Segment Reporting Information [Line Items]      
Services 740 714 618
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 9 6 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 99 59 16
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 (18,728) (14,544) (11,908)
Investment income 197 200 212
Benefits (574) (409) (336)
Operating costs (18,197) (14,165) (11,678)
Depreciation and amortization (90) (70) (27)
Total operating expenses (18,861) (14,644) (12,041)
Income from operations 133 100 133
Interest expense 192 140 105
Income before income taxes (59) (40) 28
Eliminations/Corporate | 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 Prescription Drug Plan      
Segment Reporting Information [Line Items]      
Premiums 0 0 0
Eliminations/Corporate | 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 | Military Services      
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