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Segment Information by Segment (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Segment Reporting Information [Line Items]        
Premiums $ 11,584 $ 9,701 $ 22,667 $ 19,569
Services 546 528 1,084 1,053
Total revenues - external customers 12,130 10,229 23,751 20,622
Investment income 92 92 183 185
Total revenues 12,222 10,321 23,934 20,807
Benefits 9,627 8,091 18,751 16,286
Operating costs 1,835 1,461 3,620 2,907
Depreciation and amortization 79 80 161 160
Total operating expenses 11,541 9,632 22,532 19,353
Income (loss) from operations 681 689 1,402 1,454
Interest expense 35 35 70 70
Income (loss) before income taxes 646 654 1,332 1,384
Medicare Advantage
        
Segment Reporting Information [Line Items]        
Premiums 7,841 6,732 15,685 13,658
Medicare Stand Alone Prescription Drug Plan
        
Segment Reporting Information [Line Items]        
Premiums 941 787 1,806 1,550
Medicare
        
Segment Reporting Information [Line Items]        
Premiums 8,782 7,519 17,491 15,208
Fully-Insured
        
Segment Reporting Information [Line Items]        
Premiums 2,233 1,558 4,087 3,105
Specialty
        
Segment Reporting Information [Line Items]        
Premiums 341 327 675 651
Military Services
        
Segment Reporting Information [Line Items]        
Premiums 4 5 10 16
Medicaid And Other
        
Segment Reporting Information [Line Items]        
Premiums 224 292 404 589
Provider
        
Segment Reporting Information [Line Items]        
Services 313 317 608 627
ASO And Other
        
Segment Reporting Information [Line Items]        
Services 208 198 430 404
Pharmacy
        
Segment Reporting Information [Line Items]        
Services 25 13 46 22
Intersegment revenues
        
Segment Reporting Information [Line Items]        
Total revenues (4,651) (3,598) (8,970) (7,064)
Intersegment revenues | Employer Group
        
Segment Reporting Information [Line Items]        
Total revenues 16 12 35 23
Intersegment revenues | Healthcare Services
        
Segment Reporting Information [Line Items]        
Total revenues 4,635 3,586 8,935 7,041
Intersegment revenues | Services
        
Segment Reporting Information [Line Items]        
Total revenues (3,713) (2,918) (7,186) (5,730)
Intersegment revenues | Services | Employer Group
        
Segment Reporting Information [Line Items]        
Total revenues 16 12 35 23
Intersegment revenues | Services | Healthcare Services
        
Segment Reporting Information [Line Items]        
Total revenues 3,697 2,906 7,151 5,707
Intersegment revenues | Products
        
Segment Reporting Information [Line Items]        
Total revenues (938) (680) (1,784) (1,334)
Intersegment revenues | Products | Healthcare Services
        
Segment Reporting Information [Line Items]        
Total revenues 938 680 1,784 1,334
Operating Segments | Retail
        
Segment Reporting Information [Line Items]        
Premiums 8,598 6,766 16,674 13,670
Services 13 2 27 4
Total revenues - external customers 8,611 6,768 16,701 13,674
Investment income 18 18 37 36
Total revenues 8,629 6,786 16,738 13,710
Benefits 7,283 5,696 14,170 11,625
Operating costs 982 640 1,905 1,253
Depreciation and amortization 35 32 72 64
Total operating expenses 8,300 6,368 16,147 12,942
Income (loss) from operations 329 418 591 768
Income (loss) before income taxes 329 418 591 768
Operating Segments | Employer Group
        
Segment Reporting Information [Line Items]        
Premiums 2,964 2,710 5,954 5,445
Services 87 87 173 175
Total revenues - external customers 3,051 2,797 6,127 5,620
Investment income 11 10 21 21
Total revenues 3,078 2,819 6,183 5,664
Benefits 2,472 2,235 4,828 4,412
Operating costs 492 423 991 856
Depreciation and amortization 25 27 49 50
Total operating expenses 2,989 2,685 5,868 5,318
Income (loss) from operations 89 134 315 346
Income (loss) before income taxes 89 134 315 346
Operating Segments | Healthcare Services
        
Segment Reporting Information [Line Items]        
Services 332 325 643 640
Total revenues - external customers 332 325 643 640
Total revenues 4,967 3,911 9,578 7,681
Operating costs 4,726 3,751 9,116 7,367
Depreciation and amortization 35 36 71 72
Total operating expenses 4,761 3,787 9,187 7,439
Income (loss) from operations 206 124 391 242
Income (loss) before income taxes 206 124 391 242
Operating Segments | Other Businesses
        
Segment Reporting Information [Line Items]        
Premiums 22 225 39 454
Services 114 114 241 234
Total revenues - external customers 136 339 280 688
Investment income 15 15 30 30
Total revenues 151 354 310 718
Benefits 27 251 55 438
Operating costs 103 129 205 244
Depreciation and amortization 4 4 8 8
Total operating expenses 134 384 268 690
Income (loss) from operations 17 (30) 42 28
Income (loss) before income taxes 17 (30) 42 28
Operating Segments | Medicare Advantage | Retail
        
Segment Reporting Information [Line Items]        
Premiums 6,475 5,572 12,935 11,308
Operating Segments | Medicare Advantage | Employer Group
        
Segment Reporting Information [Line Items]        
Premiums 1,366 1,160 2,750 2,350
Operating Segments | Medicare Stand Alone Prescription Drug Plan | Retail
        
Segment Reporting Information [Line Items]        
Premiums 939 785 1,802 1,546
Operating Segments | Medicare Stand Alone Prescription Drug Plan | Employer Group
        
Segment Reporting Information [Line Items]        
Premiums 2 2 4 4
Operating Segments | Medicare | Retail
        
Segment Reporting Information [Line Items]        
Premiums 7,414 6,357 14,737 12,854
Operating Segments | Medicare | Employer Group
        
Segment Reporting Information [Line Items]        
Premiums 1,368 1,162 2,754 2,354
Operating Segments | Fully-Insured | Retail
        
Segment Reporting Information [Line Items]        
Premiums 912 285 1,437 564
Operating Segments | Fully-Insured | Employer Group
        
Segment Reporting Information [Line Items]        
Premiums 1,321 1,273 2,650 2,541
Operating Segments | Specialty | Retail
        
Segment Reporting Information [Line Items]        
Premiums 66 52 125 101
Operating Segments | Specialty | Employer Group
        
Segment Reporting Information [Line Items]        
Premiums 275 275 550 550
Operating Segments | Military Services | Other Businesses
        
Segment Reporting Information [Line Items]        
Premiums 4 5 10 16
Operating Segments | Medicaid And Other | Retail
        
Segment Reporting Information [Line Items]        
Premiums 206 72 375 151
Operating Segments | Medicaid And Other | Other Businesses
        
Segment Reporting Information [Line Items]        
Premiums 18 220 29 438
Operating Segments | Provider | Employer Group
        
Segment Reporting Information [Line Items]        
Services 6 5 11 9
Operating Segments | Provider | Healthcare Services
        
Segment Reporting Information [Line Items]        
Services 307 312 597 618
Operating Segments | ASO And Other | Retail
        
Segment Reporting Information [Line Items]        
Services 13 2 27 4
Operating Segments | ASO And Other | Employer Group
        
Segment Reporting Information [Line Items]        
Services 81 82 162 166
Operating Segments | ASO And Other | Other Businesses
        
Segment Reporting Information [Line Items]        
Services 114 114 241 234
Operating Segments | Pharmacy | Healthcare Services
        
Segment Reporting Information [Line Items]        
Services 25 13 46 22
Eliminations/Corporate
        
Segment Reporting Information [Line Items]        
Investment income 48 49 95 98
Total revenues (4,603) (3,549) (8,875) (6,966)
Benefits (155) (91) (302) (189)
Operating costs (4,468) (3,482) (8,597) (6,813)
Depreciation and amortization (20) (19) (39) (34)
Total operating expenses (4,643) (3,592) (8,938) (7,036)
Income (loss) from operations 40 43 63 70
Interest expense 35 35 70 70
Income (loss) before income taxes $ 5 $ 8 $ (7)