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SEGMENT INFORMATION - Reconciliation (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Feb. 16, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Segment Reporting Information [Line Items]          
Premiums   $ 13,713 $ 13,203 $ 27,524 $ 26,601
Services revenue   382 230 709 483
Investment income   164 101 305 212
Total revenues   14,259 13,534 28,538 27,296
Benefits   11,536 10,889 23,206 22,215
Operating costs   1,761 1,453 3,510 3,006
Merger termination fee and related costs, net $ 1,000 0 0 0 (947)
Depreciation and amortization   100 92 200 184
Total operating expenses   13,397 12,434 26,916 24,458
Income (loss) from operations   862 1,100 1,622 2,838
Loss on business held-for-sale   (790)   (790) 0
Interest expense   53 58 106 107
Income (loss) before income taxes   19 1,042 726 2,731
Individual Medicare Advantage          
Segment Reporting Information [Line Items]          
Premiums   8,908 8,282 17,878 16,658
Group Medicare Advantage          
Segment Reporting Information [Line Items]          
Premiums   1,509 1,277 3,033 2,595
Medicare stand-alone PDP          
Segment Reporting Information [Line Items]          
Premiums   914 925 1,810 1,866
Total Medicare          
Segment Reporting Information [Line Items]          
Premiums   11,331 10,484 22,721 21,119
Fully-insured          
Segment Reporting Information [Line Items]          
Premiums   1,481 1,715 2,993 3,494
Specialty          
Segment Reporting Information [Line Items]          
Premiums   342 323 689 645
Medicaid and other          
Segment Reporting Information [Line Items]          
Premiums   559 681 1,121 1,343
Total revenues - external customers          
Segment Reporting Information [Line Items]          
Total revenues   14,095 13,433 28,233 27,084
Services          
Segment Reporting Information [Line Items]          
Services revenue   382 230 709 483
Services | Provider          
Segment Reporting Information [Line Items]          
Services revenue   112 63 177 133
Services | ASO and other          
Segment Reporting Information [Line Items]          
Services revenue   213 147 436 312
Services | Pharmacy          
Segment Reporting Information [Line Items]          
Services revenue   57 20 96 38
Operating Segments | Retail          
Segment Reporting Information [Line Items]          
Premiums   12,006 11,273 24,074 22,679
Investment income   30 24 67 49
Total revenues   12,039 11,299 24,146 22,732
Benefits   10,270 9,672 20,822 19,723
Operating costs   1,210 963 2,432 1,917
Merger termination fee and related costs, net         0
Depreciation and amortization   66 57 132 115
Total operating expenses   11,546 10,692 23,386 21,755
Income (loss) from operations   493 607 760 977
Loss on business held-for-sale   0   0  
Interest expense   0 0 0 0
Income (loss) before income taxes   493 607 760 977
Operating Segments | Retail | Individual Medicare Advantage          
Segment Reporting Information [Line Items]          
Premiums   8,908 8,282 17,878 16,658
Operating Segments | Retail | Group Medicare Advantage          
Segment Reporting Information [Line Items]          
Premiums   1,509 1,277 3,033 2,595
Operating Segments | Retail | Medicare stand-alone PDP          
Segment Reporting Information [Line Items]          
Premiums   914 925 1,810 1,866
Operating Segments | Retail | Total Medicare          
Segment Reporting Information [Line Items]          
Premiums   11,331 10,484 22,721 21,119
Operating Segments | Retail | Fully-insured          
Segment Reporting Information [Line Items]          
Premiums   125 118 250 236
Operating Segments | Retail | Specialty          
Segment Reporting Information [Line Items]          
Premiums   0 0 0 0
Operating Segments | Retail | Medicaid and other          
Segment Reporting Information [Line Items]          
Premiums   550 671 1,103 1,324
Operating Segments | Retail | Total revenues - external customers          
Segment Reporting Information [Line Items]          
Total revenues   12,009 11,275 24,079 22,683
Operating Segments | Retail | Services          
Segment Reporting Information [Line Items]          
Services revenue   3 2 5 4
Operating Segments | Retail | Services | Provider          
Segment Reporting Information [Line Items]          
Services revenue   0 0 0 0
Operating Segments | Retail | Services | ASO and other          
Segment Reporting Information [Line Items]          
Services revenue   3 2 5 4
Operating Segments | Retail | Services | Pharmacy          
Segment Reporting Information [Line Items]          
Services revenue   0 0 0 0
Operating Segments | Group and Specialty          
Segment Reporting Information [Line Items]          
Premiums   1,688 1,673 3,427 3,373
Investment income   6 7 13 18
Total revenues   1,906 1,828 3,876 3,705
Benefits   1,357 1,312 2,630 2,598
Operating costs   447 394 910 793
Merger termination fee and related costs, net         0
Depreciation and amortization   22 21 45 42
Total operating expenses   1,826 1,727 3,585 3,433
Income (loss) from operations   80 101 291 272
Loss on business held-for-sale   0   0  
Interest expense   0 0 0 0
Income (loss) before income taxes   80 101 291 272
Operating Segments | Group and Specialty | Individual Medicare Advantage          
Segment Reporting Information [Line Items]          
Premiums   0 0 0 0
Operating Segments | Group and Specialty | Group Medicare Advantage          
Segment Reporting Information [Line Items]          
Premiums   0 0 0 0
Operating Segments | Group and Specialty | Medicare stand-alone PDP          
Segment Reporting Information [Line Items]          
Premiums   0 0 0 0
Operating Segments | Group and Specialty | Total Medicare          
Segment Reporting Information [Line Items]          
Premiums   0 0 0 0
Operating Segments | Group and Specialty | Fully-insured          
Segment Reporting Information [Line Items]          
Premiums   1,346 1,350 2,738 2,728
Operating Segments | Group and Specialty | Specialty          
Segment Reporting Information [Line Items]          
Premiums   342 323 689 645
Operating Segments | Group and Specialty | Medicaid and other          
Segment Reporting Information [Line Items]          
Premiums   0 0 0 0
Operating Segments | Group and Specialty | Total revenues - external customers          
Segment Reporting Information [Line Items]          
Total revenues   1,896 1,816 3,854 3,677
Operating Segments | Group and Specialty | Services          
Segment Reporting Information [Line Items]          
Services revenue   208 143 427 304
Operating Segments | Group and Specialty | Services | Provider          
Segment Reporting Information [Line Items]          
Services revenue   0 0 0 0
Operating Segments | Group and Specialty | Services | ASO and other          
Segment Reporting Information [Line Items]          
Services revenue   208 143 427 304
Operating Segments | Group and Specialty | Services | Pharmacy          
Segment Reporting Information [Line Items]          
Services revenue   0 0 0 0
Operating Segments | Healthcare Services          
Segment Reporting Information [Line Items]          
Premiums   0 0 0 0
Investment income   17 8 23 16
Total revenues   5,991 5,982 11,654 11,940
Benefits   0 0 0 0
Operating costs   5,749 5,677 11,190 11,357
Merger termination fee and related costs, net         0
Depreciation and amortization   36 35 85 69
Total operating expenses   5,785 5,712 11,275 11,426
Income (loss) from operations   206 270 379 514
Loss on business held-for-sale   0   0  
Interest expense   0 0 0 0
Income (loss) before income taxes   206 270 379 514
Operating Segments | Healthcare Services | Individual Medicare Advantage          
Segment Reporting Information [Line Items]          
Premiums   0 0 0 0
Operating Segments | Healthcare Services | Group Medicare Advantage          
Segment Reporting Information [Line Items]          
Premiums   0 0 0 0
Operating Segments | Healthcare Services | Medicare stand-alone PDP          
Segment Reporting Information [Line Items]          
Premiums   0 0 0 0
Operating Segments | Healthcare Services | Total Medicare          
Segment Reporting Information [Line Items]          
Premiums   0 0 0 0
Operating Segments | Healthcare Services | Fully-insured          
Segment Reporting Information [Line Items]          
Premiums   0 0 0 0
Operating Segments | Healthcare Services | Specialty          
Segment Reporting Information [Line Items]          
Premiums   0 0 0 0
Operating Segments | Healthcare Services | Medicaid and other          
Segment Reporting Information [Line Items]          
Premiums   0 0 0 0
Operating Segments | Healthcare Services | Total revenues - external customers          
Segment Reporting Information [Line Items]          
Total revenues   169 83 273 171
Operating Segments | Healthcare Services | Services          
Segment Reporting Information [Line Items]          
Services revenue   169 83 273 171
Operating Segments | Healthcare Services | Services | Provider          
Segment Reporting Information [Line Items]          
Services revenue   112 63 177 133
Operating Segments | Healthcare Services | Services | ASO and other          
Segment Reporting Information [Line Items]          
Services revenue   0 0 0 0
Operating Segments | Healthcare Services | Services | Pharmacy          
Segment Reporting Information [Line Items]          
Services revenue   57 20 96 38
Operating Segments | Individual Commercial          
Segment Reporting Information [Line Items]          
Premiums   10 247 5 530
Investment income   0 1 0 2
Total revenues   10 248 5 532
Benefits   (9) 86 (69) 242
Operating costs   1 40 3 102
Merger termination fee and related costs, net         0
Depreciation and amortization   0 4 0 7
Total operating expenses   (8) 130 (66) 351
Income (loss) from operations   18 118 71 181
Loss on business held-for-sale   0   0  
Interest expense   0 0 0 0
Income (loss) before income taxes   18 118 71 181
Operating Segments | Individual Commercial | Individual Medicare Advantage          
Segment Reporting Information [Line Items]          
Premiums   0 0 0 0
Operating Segments | Individual Commercial | Group Medicare Advantage          
Segment Reporting Information [Line Items]          
Premiums   0 0 0 0
Operating Segments | Individual Commercial | Medicare stand-alone PDP          
Segment Reporting Information [Line Items]          
Premiums   0 0 0 0
Operating Segments | Individual Commercial | Total Medicare          
Segment Reporting Information [Line Items]          
Premiums   0 0 0 0
Operating Segments | Individual Commercial | Fully-insured          
Segment Reporting Information [Line Items]          
Premiums   10 247 5 530
Operating Segments | Individual Commercial | Specialty          
Segment Reporting Information [Line Items]          
Premiums   0 0 0 0
Operating Segments | Individual Commercial | Medicaid and other          
Segment Reporting Information [Line Items]          
Premiums   0 0 0 0
Operating Segments | Individual Commercial | Total revenues - external customers          
Segment Reporting Information [Line Items]          
Total revenues   10 247 5 530
Operating Segments | Individual Commercial | Services          
Segment Reporting Information [Line Items]          
Services revenue   0 0 0 0
Operating Segments | Individual Commercial | Services | Provider          
Segment Reporting Information [Line Items]          
Services revenue   0 0 0 0
Operating Segments | Individual Commercial | Services | ASO and other          
Segment Reporting Information [Line Items]          
Services revenue   0 0 0 0
Operating Segments | Individual Commercial | Services | Pharmacy          
Segment Reporting Information [Line Items]          
Services revenue   0 0 0 0
Intersegment revenues          
Segment Reporting Information [Line Items]          
Total revenues   (5,809) (5,896) (11,367) (11,763)
Intersegment revenues | Services          
Segment Reporting Information [Line Items]          
Total revenues   (4,198) (4,314) (8,221) (8,629)
Intersegment revenues | Products          
Segment Reporting Information [Line Items]          
Total revenues   (1,611) (1,582) (3,146) (3,134)
Intersegment revenues | Retail          
Segment Reporting Information [Line Items]          
Total revenues   0 0 0 0
Intersegment revenues | Retail | Services          
Segment Reporting Information [Line Items]          
Total revenues   0 0 0 0
Intersegment revenues | Retail | Products          
Segment Reporting Information [Line Items]          
Total revenues   0 0 0 0
Intersegment revenues | Group and Specialty          
Segment Reporting Information [Line Items]          
Total revenues   4 5 9 10
Intersegment revenues | Group and Specialty | Services          
Segment Reporting Information [Line Items]          
Total revenues   4 5 9 10
Intersegment revenues | Group and Specialty | Products          
Segment Reporting Information [Line Items]          
Total revenues   0 0 0 0
Intersegment revenues | Healthcare Services          
Segment Reporting Information [Line Items]          
Total revenues   5,805 5,891 11,358 11,753
Intersegment revenues | Healthcare Services | Services          
Segment Reporting Information [Line Items]          
Total revenues   4,194 4,309 8,212 8,619
Intersegment revenues | Healthcare Services | Products          
Segment Reporting Information [Line Items]          
Total revenues   1,611 1,582 3,146 3,134
Intersegment revenues | Individual Commercial          
Segment Reporting Information [Line Items]          
Total revenues   0 0 0 0
Intersegment revenues | Individual Commercial | Services          
Segment Reporting Information [Line Items]          
Total revenues   0 0 0 0
Intersegment revenues | Individual Commercial | Products          
Segment Reporting Information [Line Items]          
Total revenues   0 0 0 0
Other Businesses          
Segment Reporting Information [Line Items]          
Premiums   9 10 18 19
Investment income   65 21 100 42
Total revenues   76 33 122 65
Benefits   39 32 65 61
Operating costs   2 2 4 6
Merger termination fee and related costs, net         0
Depreciation and amortization   0 0 0 0
Total operating expenses   41 34 69 67
Income (loss) from operations   35 (1) 53 (2)
Loss on business held-for-sale   0   0  
Interest expense   0 0 0 0
Income (loss) before income taxes   35 (1) 53 (2)
Other Businesses | Individual Medicare Advantage          
Segment Reporting Information [Line Items]          
Premiums   0 0 0 0
Other Businesses | Group Medicare Advantage          
Segment Reporting Information [Line Items]          
Premiums   0 0 0 0
Other Businesses | Medicare stand-alone PDP          
Segment Reporting Information [Line Items]          
Premiums   0 0 0 0
Other Businesses | Total Medicare          
Segment Reporting Information [Line Items]          
Premiums   0 0 0 0
Other Businesses | Fully-insured          
Segment Reporting Information [Line Items]          
Premiums   0 0 0 0
Other Businesses | Specialty          
Segment Reporting Information [Line Items]          
Premiums   0 0 0 0
Other Businesses | Medicaid and other          
Segment Reporting Information [Line Items]          
Premiums   9 10 18 19
Other Businesses | Total revenues - external customers          
Segment Reporting Information [Line Items]          
Total revenues   11 12 22 23
Other Businesses | Services          
Segment Reporting Information [Line Items]          
Services revenue   2 2 4 4
Other Businesses | Services | Provider          
Segment Reporting Information [Line Items]          
Services revenue   0 0 0 0
Other Businesses | Services | ASO and other          
Segment Reporting Information [Line Items]          
Services revenue   2 2 4 4
Other Businesses | Services | Pharmacy          
Segment Reporting Information [Line Items]          
Services revenue   0 0 0 0
Eliminations/ Corporate          
Segment Reporting Information [Line Items]          
Premiums   0 0    
Investment income   46 40 102 85
Total revenues   (5,763) (5,856) (11,265) (11,678)
Benefits   (121) (213) (242) (409)
Operating costs   (5,648) (5,623) (11,029) (11,169)
Merger termination fee and related costs, net         (947)
Depreciation and amortization   (24) (25) (62) (49)
Total operating expenses   (5,793) (5,861) (11,333) (12,574)
Income (loss) from operations   30 5 68 896
Loss on business held-for-sale   (790)   (790)  
Interest expense   53 58 106 107
Income (loss) before income taxes   (813) (53) $ (828) $ 789
Eliminations/ Corporate | Individual Medicare Advantage          
Segment Reporting Information [Line Items]          
Premiums   0 0    
Eliminations/ Corporate | Group Medicare Advantage          
Segment Reporting Information [Line Items]          
Premiums   0 0    
Eliminations/ Corporate | Medicare stand-alone PDP          
Segment Reporting Information [Line Items]          
Premiums   0 0    
Eliminations/ Corporate | Total 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 | Medicaid and other          
Segment Reporting Information [Line Items]          
Premiums   0 0    
Eliminations/ Corporate | Total revenues - external customers          
Segment Reporting Information [Line Items]          
Total revenues   0 0    
Eliminations/ Corporate | Services          
Segment Reporting Information [Line Items]          
Services revenue   0 0    
Eliminations/ Corporate | Services | Provider          
Segment Reporting Information [Line Items]          
Services revenue   0 0    
Eliminations/ Corporate | Services | ASO and other          
Segment Reporting Information [Line Items]          
Services revenue   0 0    
Eliminations/ Corporate | Services | Pharmacy          
Segment Reporting Information [Line Items]          
Services revenue   $ 0 $ 0