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Segment Information by Segment (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Segment Reporting Information [Line Items]    
Premiums $ 11,083 $ 9,868
Services 538 525
Total revenues - external customers 11,621 10,393
Investment income 91 93
Total revenues 11,712 10,486
Benefits 9,124 8,195
Operating costs 1,785 1,446
Depreciation and amortization 82 80
Total operating expenses 10,991 9,721
Income from operations 721 765
Interest expense 35 35
Income (loss) before income taxes 686 730
Medicare Advantage
    
Segment Reporting Information [Line Items]    
Premiums 7,844 6,926
Medicare Stand Alone Prescription Drug Plan
    
Segment Reporting Information [Line Items]    
Premiums 865 763
Medicare
    
Segment Reporting Information [Line Items]    
Premiums 8,709 7,689
Fully-Insured
    
Segment Reporting Information [Line Items]    
Premiums 1,854 1,547
Specialty
    
Segment Reporting Information [Line Items]    
Premiums 334 324
Military Services
    
Segment Reporting Information [Line Items]    
Premiums 6 11
Medicaid And Other
    
Segment Reporting Information [Line Items]    
Premiums 180 297
Provider
    
Segment Reporting Information [Line Items]    
Services 295 310
ASO And Other
    
Segment Reporting Information [Line Items]    
Services 222 206
Pharmacy
    
Segment Reporting Information [Line Items]    
Services 21 9
Intersegment revenues
    
Segment Reporting Information [Line Items]    
Total revenues (4,319) (3,466)
Intersegment revenues | Retail
    
Segment Reporting Information [Line Items]    
Total revenues 0 0
Intersegment revenues | Employer Group
    
Segment Reporting Information [Line Items]    
Total revenues 19 11
Intersegment revenues | Healthcare Services
    
Segment Reporting Information [Line Items]    
Total revenues 4,300 3,455
Intersegment revenues | Other Businesses
    
Segment Reporting Information [Line Items]    
Total revenues 0 0
Intersegment revenues | Services
    
Segment Reporting Information [Line Items]    
Total revenues (3,473) (2,812)
Intersegment revenues | Services | Retail
    
Segment Reporting Information [Line Items]    
Total revenues 0 0
Intersegment revenues | Services | Employer Group
    
Segment Reporting Information [Line Items]    
Total revenues 19 11
Intersegment revenues | Services | Healthcare Services
    
Segment Reporting Information [Line Items]    
Total revenues 3,454 2,801
Intersegment revenues | Services | Other Businesses
    
Segment Reporting Information [Line Items]    
Total revenues 0 0
Intersegment revenues | Products
    
Segment Reporting Information [Line Items]    
Total revenues (846) (654)
Intersegment revenues | Products | Retail
    
Segment Reporting Information [Line Items]    
Total revenues 0 0
Intersegment revenues | Products | Employer Group
    
Segment Reporting Information [Line Items]    
Total revenues 0 0
Intersegment revenues | Products | Healthcare Services
    
Segment Reporting Information [Line Items]    
Total revenues 846 654
Intersegment revenues | Products | Other Businesses
    
Segment Reporting Information [Line Items]    
Total revenues 0 0
Operating Segments | Retail
    
Segment Reporting Information [Line Items]    
Premiums 8,076 6,904
Services 14 2
Total revenues - external customers 8,090 6,906
Investment income 19 18
Total revenues 8,109 6,924
Benefits 6,887 5,929
Operating costs 923 613
Depreciation and amortization 37 32
Total operating expenses 7,847 6,574
Income from operations 262 350
Interest expense 0 0
Income (loss) before income taxes 262 350
Operating Segments | Employer Group
    
Segment Reporting Information [Line Items]    
Premiums 2,990 2,735
Services 86 88
Total revenues - external customers 3,076 2,823
Investment income 10 11
Total revenues 3,105 2,845
Benefits 2,356 2,177
Operating costs 499 433
Depreciation and amortization 24 23
Total operating expenses 2,879 2,633
Income from operations 226 212
Interest expense 0 0
Income (loss) before income taxes 226 212
Operating Segments | Healthcare Services
    
Segment Reporting Information [Line Items]    
Premiums 0 0
Services 311 315
Total revenues - external customers 311 315
Investment income 0 0
Total revenues 4,611 3,770
Benefits 0 0
Operating costs 4,390 3,616
Depreciation and amortization 36 36
Total operating expenses 4,426 3,652
Income from operations 185 118
Interest expense 0 0
Income (loss) before income taxes 185 118
Operating Segments | Other Businesses
    
Segment Reporting Information [Line Items]    
Premiums 17 229
Services 127 120
Total revenues - external customers 144 349
Investment income 15 15
Total revenues 159 364
Benefits 28 187
Operating costs 102 115
Depreciation and amortization 4 4
Total operating expenses 134 306
Income from operations 25 58
Interest expense 0 0
Income (loss) before income taxes 25 58
Operating Segments | Medicare Advantage | Retail
    
Segment Reporting Information [Line Items]    
Premiums 6,460 5,736
Operating Segments | Medicare Advantage | Employer Group
    
Segment Reporting Information [Line Items]    
Premiums 1,384 1,190
Operating Segments | Medicare Advantage | Healthcare Services
    
Segment Reporting Information [Line Items]    
Premiums 0 0
Operating Segments | Medicare Advantage | Other Businesses
    
Segment Reporting Information [Line Items]    
Premiums 0 0
Operating Segments | Medicare Stand Alone Prescription Drug Plan | Retail
    
Segment Reporting Information [Line Items]    
Premiums 863 761
Operating Segments | Medicare Stand Alone Prescription Drug Plan | Employer Group
    
Segment Reporting Information [Line Items]    
Premiums 2 2
Operating Segments | Medicare Stand Alone Prescription Drug Plan | Healthcare Services
    
Segment Reporting Information [Line Items]    
Premiums 0 0
Operating Segments | Medicare Stand Alone Prescription Drug Plan | Other Businesses
    
Segment Reporting Information [Line Items]    
Premiums 0 0
Operating Segments | Medicare | Retail
    
Segment Reporting Information [Line Items]    
Premiums 7,323 6,497
Operating Segments | Medicare | Employer Group
    
Segment Reporting Information [Line Items]    
Premiums 1,386 1,192
Operating Segments | Medicare | Healthcare Services
    
Segment Reporting Information [Line Items]    
Premiums 0 0
Operating Segments | Medicare | Other Businesses
    
Segment Reporting Information [Line Items]    
Premiums 0 0
Operating Segments | Fully-Insured | Retail
    
Segment Reporting Information [Line Items]    
Premiums 525 279
Operating Segments | Fully-Insured | Employer Group
    
Segment Reporting Information [Line Items]    
Premiums 1,329 1,268
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 59 49
Operating Segments | Specialty | Employer Group
    
Segment Reporting Information [Line Items]    
Premiums 275 275
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 | Military Services | Retail
    
Segment Reporting Information [Line Items]    
Premiums 0 0
Operating Segments | Military Services | Employer Group
    
Segment Reporting Information [Line Items]    
Premiums 0 0
Operating Segments | Military Services | Healthcare Services
    
Segment Reporting Information [Line Items]    
Premiums 0 0
Operating Segments | Military Services | Other Businesses
    
Segment Reporting Information [Line Items]    
Premiums 6 11
Operating Segments | Medicaid And Other | Retail
    
Segment Reporting Information [Line Items]    
Premiums 169 79
Operating Segments | Medicaid And Other | Employer Group
    
Segment Reporting Information [Line Items]    
Premiums 0 0
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 11 218
Operating Segments | Provider | Retail
    
Segment Reporting Information [Line Items]    
Services 0 0
Operating Segments | Provider | Employer Group
    
Segment Reporting Information [Line Items]    
Services 5 4
Operating Segments | Provider | Healthcare Services
    
Segment Reporting Information [Line Items]    
Services 290 306
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 14 2
Operating Segments | ASO And Other | Employer Group
    
Segment Reporting Information [Line Items]    
Services 81 84
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 127 120
Operating Segments | Pharmacy | Retail
    
Segment Reporting Information [Line Items]    
Services 0 0
Operating Segments | Pharmacy | Employer Group
    
Segment Reporting Information [Line Items]    
Services 0 0
Operating Segments | Pharmacy | Healthcare Services
    
Segment Reporting Information [Line Items]    
Services 21 9
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 47 49
Total revenues (4,272) (3,417)
Benefits (147) (98)
Operating costs (4,129) (3,331)
Depreciation and amortization (19) (15)
Total operating expenses (4,295) (3,444)
Income from operations 23 27
Interest expense 35 35
Income (loss) before income taxes (12) (8)
Eliminations/Corporate | Medicare Advantage
    
Segment Reporting Information [Line Items]    
Premiums 0 0
Eliminations/Corporate | Medicare Stand Alone Prescription Drug Plan
    
Segment Reporting Information [Line Items]    
Premiums 0 0
Eliminations/Corporate | 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 | Military Services
    
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