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Segment Information by Segment (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 $ 37,009 $ 35,106 $ 32,712
Total services revenue                 1,726 1,360 555
Total revenues - external customers                 38,735 36,466 33,267
Total intersegment revenues                 0 0 0
Investment income                 391 366 329
Total revenues 9,557 9,651 9,699 [1] 10,219 9,056 9,301 9,284 9,191 39,126 36,832 33,596
Operating expenses, Benefits                 30,985 28,823 27,117
Operating expenses, Operating costs                 5,830 5,395 4,380
Operating expenses, Depreciation and amortization                 295 270 245
Total operating expenses                 37,110 34,488 31,742
Income (loss) from operations                 2,016 2,344 1,854
Interest expense                 105 109 105
Income (loss) before income taxes 282 675 564 [1] 390 313 699 726 497 1,911 2,235 1,749
Medicare Advantage
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 24,852 21,252 19,286
Medicare Stand Alone Prescription Drug Plan
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 2,861 2,578 2,319
Medicare
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 27,713 23,830 21,605
Fully-Insured
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 6,000 5,643 5,915
Specialty
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 1,241 1,059 967
Military Services
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 1,017 3,616 3,462
Medicaid And Other
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 1,038 958 763
Provider
                      
Segment Reporting Information [Line Items]                      
Total services revenue                 1,020 892 34
Aso And Other
                      
Segment Reporting Information [Line Items]                      
Total services revenue                 690 457 521
Pharmacy
                      
Segment Reporting Information [Line Items]                      
Total services revenue                 16 11 0
Services
                      
Segment Reporting Information [Line Items]                      
Total intersegment revenues                 0 0 0
Products
                      
Segment Reporting Information [Line Items]                      
Total intersegment revenues                 0 0 0
Retail
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 24,550 21,402 19,052
Total services revenue                 24 16 11
Total revenues - external customers                 24,574 21,418 19,063
Total intersegment revenues                 2 0 0
Investment income                 79 76 80
Total revenues                 24,655 21,494 19,143
Operating expenses, Benefits                 20,651 17,383 15,624
Operating expenses, Operating costs                 2,711 2,405 2,113
Operating expenses, Depreciation and amortization                 131 119 117
Total operating expenses                 23,493 19,907 17,854
Income (loss) from operations                 1,162 1,587 1,289
Interest expense                 0 0 0
Income (loss) before income taxes                 1,162 1,587 1,289
Retail | Medicare Advantage
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 20,788 18,100 16,265
Retail | Medicare Stand Alone Prescription Drug Plan
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 2,587 2,317 1,959
Retail | Medicare
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 23,375 20,417 18,224
Retail | Fully-Insured
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 1,004 861 746
Retail | Specialty
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 171 124 82
Retail | Military Services
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 0 0 0
Retail | Medicaid And Other
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 0 0 0
Retail | Provider
                      
Segment Reporting Information [Line Items]                      
Total services revenue                 0 0 0
Retail | Aso And Other
                      
Segment Reporting Information [Line Items]                      
Total services revenue                 24 16 11
Retail | Pharmacy
                      
Segment Reporting Information [Line Items]                      
Total services revenue                 0 0 0
Retail | Services
                      
Segment Reporting Information [Line Items]                      
Total intersegment revenues                 2 0 0
Retail | Products
                      
Segment Reporting Information [Line Items]                      
Total intersegment revenues                 0 0 0
Employer Group
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 10,138 8,877 9,080
Total services revenue                 358 356 395
Total revenues - external customers                 10,496 9,233 9,475
Total intersegment revenues                 15 14 12
Investment income                 42 48 42
Total revenues                 10,553 9,295 9,529
Operating expenses, Benefits                 8,524 7,318 7,486
Operating expenses, Operating costs                 1,696 1,650 1,662
Operating expenses, Depreciation and amortization                 80 85 93
Total operating expenses                 10,300 9,053 9,241
Income (loss) from operations                 253 242 288
Interest expense                 0 0 0
Income (loss) before income taxes                 253 242 288
Employer Group | Medicare Advantage
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 4,064 3,152 3,021
Employer Group | Medicare Stand Alone Prescription Drug Plan
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 8 8 5
Employer Group | Medicare
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 4,072 3,160 3,026
Employer Group | Fully-Insured
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 4,996 4,782 5,169
Employer Group | Specialty
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 1,070 935 885
Employer Group | Military Services
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 0 0 0
Employer Group | Medicaid And Other
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 0 0 0
Employer Group | Provider
                      
Segment Reporting Information [Line Items]                      
Total services revenue                 0 0 0
Employer Group | Aso And Other
                      
Segment Reporting Information [Line Items]                      
Total services revenue                 358 356 395
Employer Group | Pharmacy
                      
Segment Reporting Information [Line Items]                      
Total services revenue                 0 0 0
Employer Group | Services
                      
Segment Reporting Information [Line Items]                      
Total intersegment revenues                 15 14 12
Employer Group | Products
                      
Segment Reporting Information [Line Items]                      
Total intersegment revenues                 0 0 0
Health And Well-Being Services
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 0 0 0
Total services revenue                 1,036 903 34
Total revenues - external customers                 1,036 903 34
Total intersegment revenues                 11,952 10,330 8,786
Investment income                 0 0 0
Total revenues                 12,988 11,233 8,820
Operating expenses, Benefits                 0 0 0
Operating expenses, Operating costs                 12,407 10,798 8,575
Operating expenses, Depreciation and amortization                 95 82 26
Total operating expenses                 12,502 10,880 8,601
Income (loss) from operations                 486 353 219
Interest expense                 0 0 0
Income (loss) before income taxes                 486 353 219
Health And Well-Being Services | Medicare Advantage
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 0 0 0
Health And Well-Being Services | Medicare Stand Alone Prescription Drug Plan
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 0 0 0
Health And Well-Being Services | Medicare
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 0 0 0
Health And Well-Being Services | Fully-Insured
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 0 0 0
Health And Well-Being Services | Specialty
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 0 0 0
Health And Well-Being Services | Military Services
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 0 0 0
Health And Well-Being Services | Medicaid And Other
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 0 0 0
Health And Well-Being Services | Provider
                      
Segment Reporting Information [Line Items]                      
Total services revenue                 1,020 892 34
Health And Well-Being Services | Aso And Other
                      
Segment Reporting Information [Line Items]                      
Total services revenue                 0 0 0
Health And Well-Being Services | Pharmacy
                      
Segment Reporting Information [Line Items]                      
Total services revenue                 16 11 0
Health And Well-Being Services | Services
                      
Segment Reporting Information [Line Items]                      
Total intersegment revenues                 9,610 8,510 7,494
Health And Well-Being Services | Products
                      
Segment Reporting Information [Line Items]                      
Total intersegment revenues                 2,342 1,820 1,292
Other Businesses
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 2,321 4,827 4,580
Total services revenue                 308 85 115
Total revenues - external customers                 2,629 4,912 4,695
Total intersegment revenues                 0 0 0
Investment income                 58 54 43
Total revenues                 2,687 4,966 4,738
Operating expenses, Benefits                 2,198 4,411 4,253
Operating expenses, Operating costs                 492 461 475
Operating expenses, Depreciation and amortization                 16 10 12
Total operating expenses                 2,706 4,882 4,740
Income (loss) from operations                 (19) 84 (2)
Interest expense                 0 0 0
Income (loss) before income taxes                 (19) 84 (2)
Other Businesses | Medicare Advantage
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 0 0 0
Other Businesses | Medicare Stand Alone Prescription Drug Plan
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 266 253 355
Other Businesses | Medicare
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 266 253 355
Other Businesses | Fully-Insured
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 0 0 0
Other Businesses | Specialty
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 0 0 0
Other Businesses | Military Services
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 1,017 3,616 3,462
Other Businesses | Medicaid And Other
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 1,038 958 763
Other Businesses | Provider
                      
Segment Reporting Information [Line Items]                      
Total services revenue                 0 0 0
Other Businesses | Aso And Other
                      
Segment Reporting Information [Line Items]                      
Total services revenue                 308 85 115
Other Businesses | Pharmacy
                      
Segment Reporting Information [Line Items]                      
Total services revenue                 0 0 0
Other Businesses | Services
                      
Segment Reporting Information [Line Items]                      
Total intersegment revenues                 0 0 0
Other Businesses | Products
                      
Segment Reporting Information [Line Items]                      
Total intersegment revenues                 0 0 0
Corporate Elimination
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 0 0 0
Total services revenue                 0 0 0
Total revenues - external customers                 0 0 0
Total intersegment revenues                 (11,969) (10,344) (8,798)
Investment income                 212 188 164
Total revenues                 (11,757) (10,156) (8,634)
Operating expenses, Benefits                 (388) (289) (246)
Operating expenses, Operating costs                 (11,476) (9,919) (8,445)
Operating expenses, Depreciation and amortization                 (27) (26) (3)
Total operating expenses                 (11,891) (10,234) (8,694)
Income (loss) from operations                 134 78 60
Interest expense                 105 109 105
Income (loss) before income taxes                 29 (31) (45)
Corporate Elimination | Medicare Advantage
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 0 0 0
Corporate Elimination | Medicare Stand Alone Prescription Drug Plan
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 0 0 0
Corporate Elimination | Medicare
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 0 0 0
Corporate Elimination | Fully-Insured
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 0 0 0
Corporate Elimination | Specialty
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 0 0 0
Corporate Elimination | Military Services
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 0 0 0
Corporate Elimination | Medicaid And Other
                      
Segment Reporting Information [Line Items]                      
Revenues-external customers, Premiums                 0 0 0
Corporate Elimination | Provider
                      
Segment Reporting Information [Line Items]                      
Total services revenue                 0 0 0
Corporate Elimination | Aso And Other
                      
Segment Reporting Information [Line Items]                      
Total services revenue                 0 0 0
Corporate Elimination | Pharmacy
                      
Segment Reporting Information [Line Items]                      
Total services revenue                 0 0 0
Corporate Elimination | Services
                      
Segment Reporting Information [Line Items]                      
Total intersegment revenues                 (9,627) (8,524) (7,506)
Corporate Elimination | Products
                      
Segment Reporting Information [Line Items]                      
Total intersegment revenues                 $ (2,342) $ (1,820) $ (1,292)
[1] Includes an expense of $46 million ($29 million after tax, or $0.18 per diluted common share) for a litigation settlement associated with our military services business.