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SEGMENT INFORMATION - Information by Segment (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]                      
Premiums                 $ 52,380 $ 53,021 $ 52,409
Services                 982 969 1,406
Total revenues—external customers                 53,362 53,990 53,815
Total revenues $ 13,189 $ 13,282 $ 13,534 $ 13,762 $ 12,878 $ 13,694 $ 14,007 $ 13,800 53,767 54,379 54,289
Investment income                 405 389 474
Benefits                 43,496 45,007 44,269
Operating costs                 6,567 7,173 7,295
Merger termination fee and related costs, net                 (936) 104 23
Depreciation and amortization                 378 354 355
Total operating expenses                 49,505 52,638 51,942
Income (loss) from operations                 4,262 1,741 2,347
Gain on sale of business                 0 0 270
Interest expense                 242 189 186
Income (loss) before income taxes $ 490 $ 799 $ 1,042 $ 1,689 $ (486) $ 902 $ 636 $ 500 4,020 1,552 2,431
Individual Medicare Advantage                      
Segment Reporting Information [Line Items]                      
Premiums                 32,720 31,863 29,526
Group Medicare Advantage                      
Segment Reporting Information [Line Items]                      
Premiums                 5,155 4,283 5,588
Medicare stand-alone PDP                      
Segment Reporting Information [Line Items]                      
Premiums                 3,702 4,009 3,846
Total Medicare                      
Segment Reporting Information [Line Items]                      
Premiums                 41,577 40,155 38,960
Fully-insured                      
Segment Reporting Information [Line Items]                      
Premiums                 6,887 8,897 9,736
Specialty                      
Segment Reporting Information [Line Items]                      
Premiums                 1,310 1,279 1,316
Medicaid and other                      
Segment Reporting Information [Line Items]                      
Premiums                 2,606 2,690 2,397
Provider                      
Segment Reporting Information [Line Items]                      
Services                 258 278 695
ASO and other                      
Segment Reporting Information [Line Items]                      
Services                 644 660 681
Pharmacy                      
Segment Reporting Information [Line Items]                      
Services                 80 31 30
Operating Segments | Retail                      
Segment Reporting Information [Line Items]                      
Premiums                 44,626 43,223 41,605
Services                 10 6 8
Total revenues—external customers                 44,636 43,229 41,613
Total revenues                 44,726 43,319 41,735
Investment income                 90 90 122
Benefits                 38,218 36,783 36,052
Operating costs                 4,292 4,650 4,267
Merger termination fee and related costs, net                 0 0 0
Depreciation and amortization                 238 196 157
Total operating expenses                 42,748 41,629 40,476
Income (loss) from operations                 1,978 1,690 1,259
Gain on sale of business                     0
Interest expense                 0 0 0
Income (loss) before income taxes                 1,978 1,690 1,259
Operating Segments | Group and Specialty                      
Segment Reporting Information [Line Items]                      
Premiums                 6,772 6,696 6,830
Services                 626 643 658
Total revenues—external customers                 7,398 7,339 7,488
Total revenues                 7,449 7,386 7,542
Investment income                 31 25 34
Benefits                 5,363 5,233 5,382
Operating costs                 1,590 1,727 1,755
Merger termination fee and related costs, net                 0 0 0
Depreciation and amortization                 84 82 84
Total operating expenses                 7,037 7,042 7,221
Income (loss) from operations                 412 344 321
Gain on sale of business                     0
Interest expense                 0 0 0
Income (loss) before income taxes                 412 344 321
Operating Segments | Healthcare Services                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Services                 338 310 726
Total revenues—external customers                 338 310 726
Total revenues                 23,958 25,312 23,776
Investment income                 35 30 0
Benefits                 0 0 0
Operating costs                 22,848 24,073 22,598
Merger termination fee and related costs, net                 0 0 0
Depreciation and amortization                 143 143 156
Total operating expenses                 22,991 24,216 22,754
Income (loss) from operations                 967 1,096 1,022
Gain on sale of business                     0
Interest expense                 0 0 0
Income (loss) before income taxes                 967 1,096 1,022
Operating Segments | Individual Commercial                      
Segment Reporting Information [Line Items]                      
Premiums                 947 3,064 3,939
Services                 0 0 0
Total revenues—external customers                 947 3,064 3,939
Total revenues                 951 3,069 3,943
Investment income                 4 5 4
Benefits                 544 3,301 3,589
Operating costs                 201 601 756
Merger termination fee and related costs, net                 0 0 0
Depreciation and amortization                 13 36 31
Total operating expenses                 758 3,938 4,376
Income (loss) from operations                 193 (869) (433)
Gain on sale of business                     0
Interest expense                 0 0 0
Income (loss) before income taxes                 193 (869) (433)
Operating Segments | Individual Medicare Advantage | Retail                      
Segment Reporting Information [Line Items]                      
Premiums                 32,720 31,863 29,526
Operating Segments | Individual Medicare Advantage | Group and Specialty                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Operating Segments | Individual Medicare Advantage | Healthcare Services                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Operating Segments | Individual Medicare Advantage | Individual Commercial                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Operating Segments | Group Medicare Advantage | Retail                      
Segment Reporting Information [Line Items]                      
Premiums                 5,155 4,283 5,588
Operating Segments | Group Medicare Advantage | Group and Specialty                      
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 | Individual Commercial                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Operating Segments | Medicare stand-alone PDP | Retail                      
Segment Reporting Information [Line Items]                      
Premiums                 3,702 4,009 3,846
Operating Segments | Medicare stand-alone PDP | Group and Specialty                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Operating Segments | Medicare stand-alone PDP | Healthcare Services                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Operating Segments | Medicare stand-alone PDP | Individual Commercial                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Operating Segments | Total Medicare | Retail                      
Segment Reporting Information [Line Items]                      
Premiums                 41,577 40,155 38,960
Operating Segments | Total Medicare | Group and Specialty                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Operating Segments | Total Medicare | Healthcare Services                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Operating Segments | Total Medicare | Individual Commercial                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Operating Segments | Fully-insured | Retail                      
Segment Reporting Information [Line Items]                      
Premiums                 478 428 304
Operating Segments | Fully-insured | Group and Specialty                      
Segment Reporting Information [Line Items]                      
Premiums                 5,462 5,405 5,493
Operating Segments | Fully-insured | Healthcare Services                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Operating Segments | Fully-insured | Individual Commercial                      
Segment Reporting Information [Line Items]                      
Premiums                 947 3,064 3,939
Operating Segments | Specialty | Retail                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Operating Segments | Specialty | Group and Specialty                      
Segment Reporting Information [Line Items]                      
Premiums                 1,310 1,279 1,316
Operating Segments | Specialty | Healthcare Services                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Operating Segments | Specialty | Individual Commercial                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Operating Segments | Medicaid and other | Retail                      
Segment Reporting Information [Line Items]                      
Premiums                 2,571 2,640 2,341
Operating Segments | Medicaid and other | Group and Specialty                      
Segment Reporting Information [Line Items]                      
Premiums                 0 12 21
Operating Segments | Medicaid and other | Healthcare Services                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Operating Segments | Medicaid and other | Individual Commercial                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Operating Segments | Provider | Retail                      
Segment Reporting Information [Line Items]                      
Services                 0 0 0
Operating Segments | Provider | Group and Specialty                      
Segment Reporting Information [Line Items]                      
Services                 0 0 0
Operating Segments | Provider | Healthcare Services                      
Segment Reporting Information [Line Items]                      
Services                 258 278 695
Operating Segments | Provider | Individual Commercial                      
Segment Reporting Information [Line Items]                      
Services                 0 0 0
Operating Segments | ASO and other | Retail                      
Segment Reporting Information [Line Items]                      
Services                 10 6 8
Operating Segments | ASO and other | Group and Specialty                      
Segment Reporting Information [Line Items]                      
Services                 626 643 658
Operating Segments | ASO and other | Healthcare Services                      
Segment Reporting Information [Line Items]                      
Services                 0 1 1
Operating Segments | ASO and other | Individual Commercial                      
Segment Reporting Information [Line Items]                      
Services                 0 0 0
Operating Segments | Pharmacy | Retail                      
Segment Reporting Information [Line Items]                      
Services                 0 0 0
Operating Segments | Pharmacy | Group and Specialty                      
Segment Reporting Information [Line Items]                      
Services                 0 0 0
Operating Segments | Pharmacy | Healthcare Services                      
Segment Reporting Information [Line Items]                      
Services                 80 31 30
Operating Segments | Pharmacy | Individual Commercial                      
Segment Reporting Information [Line Items]                      
Services                 0 0 0
Other Businesses                      
Segment Reporting Information [Line Items]                      
Premiums                 35 38 35
Services                 8 10 14
Total revenues—external customers                 43 48 49
Total revenues                 130 114 125
Investment income                 87 66 76
Benefits                 131 617 87
Operating costs                 12 16 14
Merger termination fee and related costs, net                 0 0 0
Depreciation and amortization                 0 1 0
Total operating expenses                 143 634 101
Income (loss) from operations                 (13) (520) 24
Gain on sale of business                     0
Interest expense                 0 0 0
Income (loss) before income taxes                 (13) (520) 24
Other Businesses | Individual Medicare Advantage                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Other Businesses | Group Medicare Advantage                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Other Businesses | Medicare stand-alone PDP                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Other Businesses | Total Medicare                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Other Businesses | Fully-insured                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Other Businesses | Specialty                      
Segment Reporting Information [Line Items]                      
Premiums                 0 0 0
Other Businesses | Medicaid and other                      
Segment Reporting Information [Line Items]                      
Premiums                 35 38 35
Other Businesses | Provider                      
Segment Reporting Information [Line Items]                      
Services                 0 0 0
Other Businesses | ASO and other                      
Segment Reporting Information [Line Items]                      
Services                 8 10 14
Other Businesses | Pharmacy                      
Segment Reporting Information [Line Items]                      
Services                 0 0 0
Corporate/Eliminations                      
Segment Reporting Information [Line Items]                      
Total revenues                 (23,447) (24,821) (22,832)
Investment income                 158 173 238
Benefits                 (760) (927) (841)
Operating costs                 (22,376) (23,894) (22,095)
Merger termination fee and related costs, net                 (936) 104 23
Depreciation and amortization                 (100) (104) (73)
Total operating expenses                 (24,172) (24,821) (22,986)
Income (loss) from operations                 725 0 154
Gain on sale of business                     270
Interest expense                 242 189 186
Income (loss) before income taxes                 483 (189) 238
Intersegment revenues                      
Segment Reporting Information [Line Items]                      
Total revenues                 (23,605) (24,994) (23,070)
Intersegment revenues | Retail                      
Segment Reporting Information [Line Items]                      
Total revenues                 0 0 0
Intersegment revenues | Group and Specialty                      
Segment Reporting Information [Line Items]                      
Total revenues                 20 22 20
Intersegment revenues | Healthcare Services                      
Segment Reporting Information [Line Items]                      
Total revenues                 23,585 24,972 23,050
Intersegment revenues | Individual Commercial                      
Segment Reporting Information [Line Items]                      
Total revenues                 0 0 0
Intersegment revenues | Services                      
Segment Reporting Information [Line Items]                      
Total revenues                 (17,313) (19,001) (18,147)
Intersegment revenues | Services | Retail                      
Segment Reporting Information [Line Items]                      
Total revenues                 0 0 0
Intersegment revenues | Services | Group and Specialty                      
Segment Reporting Information [Line Items]                      
Total revenues                 20 22 20
Intersegment revenues | Services | Healthcare Services                      
Segment Reporting Information [Line Items]                      
Total revenues                 17,293 18,979 18,127
Intersegment revenues | Services | Individual Commercial                      
Segment Reporting Information [Line Items]                      
Total revenues                 0 0 0
Intersegment revenues | Products                      
Segment Reporting Information [Line Items]                      
Total revenues                 (6,292) (5,993) (4,923)
Intersegment revenues | Products | Retail                      
Segment Reporting Information [Line Items]                      
Total revenues                 0 0 0
Intersegment revenues | Products | Group and Specialty                      
Segment Reporting Information [Line Items]                      
Total revenues                 0 0 0
Intersegment revenues | Products | Healthcare Services                      
Segment Reporting Information [Line Items]                      
Total revenues                 6,292 5,993 4,923
Intersegment revenues | Products | Individual Commercial                      
Segment Reporting Information [Line Items]                      
Total revenues                 $ 0 $ 0 $ 0