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SEGMENT INFORMATION - Reconciliation (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Segment Reporting Information [Line Items]    
Premiums $ 13,398 $ 13,440
Services 253 260
Revenues 13,651 13,700
Investment income 111 100
Total revenues 13,762 13,800
Benefits 11,326 11,397
Operating costs 1,553 1,734
Merger termination fee and related costs, net (947) 34
Depreciation and amortization 92 88
Total operating expenses 12,024 13,253
Interest expense 1,738 547
Interest expense 49 47
Income (loss) before income taxes 1,689 500
Individual Medicare Advantage    
Segment Reporting Information [Line Items]    
Premiums 8,376 8,027
Group Medicare Advantage    
Segment Reporting Information [Line Items]    
Premiums 1,318 1,077
Medicare stand-alone PDP    
Segment Reporting Information [Line Items]    
Premiums 941 1,039
Total Medicare    
Segment Reporting Information [Line Items]    
Premiums 10,635 10,143
Fully-insured    
Segment Reporting Information [Line Items]    
Premiums 1,779 2,334
Specialty    
Segment Reporting Information [Line Items]    
Premiums 322 318
Medicaid and other    
Segment Reporting Information [Line Items]    
Premiums 662 645
Provider    
Segment Reporting Information [Line Items]    
Services 70 71
ASO and other    
Segment Reporting Information [Line Items]    
Services 165 182
Pharmacy    
Segment Reporting Information [Line Items]    
Services 18 7
Intersegment revenues    
Segment Reporting Information [Line Items]    
Revenues (5,867) (6,150)
Intersegment revenues | Retail    
Segment Reporting Information [Line Items]    
Revenues 0 0
Intersegment revenues | Group and Specialty    
Segment Reporting Information [Line Items]    
Revenues 5 6
Intersegment revenues | Healthcare Services    
Segment Reporting Information [Line Items]    
Revenues 5,862 6,144
Intersegment revenues | Individual Commercial    
Segment Reporting Information [Line Items]    
Revenues 0 0
Intersegment revenues | Services    
Segment Reporting Information [Line Items]    
Revenues (4,315) (4,790)
Intersegment revenues | Services | Retail    
Segment Reporting Information [Line Items]    
Revenues 0 0
Intersegment revenues | Services | Group and Specialty    
Segment Reporting Information [Line Items]    
Revenues 5 6
Intersegment revenues | Services | Healthcare Services    
Segment Reporting Information [Line Items]    
Revenues 4,310 4,784
Intersegment revenues | Services | Individual Commercial    
Segment Reporting Information [Line Items]    
Revenues 0 0
Intersegment revenues | Products    
Segment Reporting Information [Line Items]    
Revenues (1,552) (1,360)
Intersegment revenues | Products | Retail    
Segment Reporting Information [Line Items]    
Revenues 0 0
Intersegment revenues | Products | Group and Specialty    
Segment Reporting Information [Line Items]    
Revenues 0 0
Intersegment revenues | Products | Healthcare Services    
Segment Reporting Information [Line Items]    
Revenues 1,552 1,360
Intersegment revenues | Products | Individual Commercial    
Segment Reporting Information [Line Items]    
Revenues 0 0
Operating Segments | Retail    
Segment Reporting Information [Line Items]    
Premiums 11,406 10,877
Services 2 1
Revenues 11,408 10,878
Investment income 25 24
Total revenues 11,433 10,902
Benefits 10,051 9,633
Operating costs 954 1,082
Depreciation and amortization 58 46
Total operating expenses 11,063 10,761
Interest expense 370 141
Interest expense 0 0
Income (loss) before income taxes 370 141
Operating Segments | Group and Specialty    
Segment Reporting Information [Line Items]    
Premiums 1,700 1,660
Services 161 177
Revenues 1,861 1,837
Investment income 11 6
Total revenues 1,877 1,849
Benefits 1,286 1,222
Operating costs 399 434
Depreciation and amortization 21 21
Total operating expenses 1,706 1,677
Interest expense 171 172
Interest expense 0 0
Income (loss) before income taxes 171 172
Operating Segments | Healthcare Services    
Segment Reporting Information [Line Items]    
Premiums 0 0
Services 88 79
Revenues 88 79
Investment income 8 7
Total revenues 5,958 6,230
Benefits 0 0
Operating costs 5,680 5,942
Depreciation and amortization 34 36
Total operating expenses 5,714 5,978
Interest expense 244 252
Interest expense 0 0
Income (loss) before income taxes 244 252
Operating Segments | Individual Commercial    
Segment Reporting Information [Line Items]    
Premiums 283 893
Services 0 0
Revenues 283 893
Investment income 1 2
Total revenues 284 895
Benefits 156 729
Operating costs 62 169
Depreciation and amortization 3 9
Total operating expenses 221 907
Interest expense 63 (12)
Interest expense 0 0
Income (loss) before income taxes 63 (12)
Operating Segments | Individual Medicare Advantage | Retail    
Segment Reporting Information [Line Items]    
Premiums 8,376 8,027
Operating Segments | Individual Medicare Advantage | Group and Specialty    
Segment Reporting Information [Line Items]    
Premiums 0 0
Operating Segments | Individual Medicare Advantage | Healthcare Services    
Segment Reporting Information [Line Items]    
Premiums 0 0
Operating Segments | Individual Medicare Advantage | Individual Commercial    
Segment Reporting Information [Line Items]    
Premiums 0 0
Operating Segments | Group Medicare Advantage | Retail    
Segment Reporting Information [Line Items]    
Premiums 1,318 1,077
Operating Segments | Group Medicare Advantage | Group and Specialty    
Segment Reporting Information [Line Items]    
Premiums 0 0
Operating Segments | Group Medicare Advantage | Healthcare Services    
Segment Reporting Information [Line Items]    
Premiums 0 0
Operating Segments | Group Medicare Advantage | Individual Commercial    
Segment Reporting Information [Line Items]    
Premiums 0 0
Operating Segments | Medicare stand-alone PDP | Retail    
Segment Reporting Information [Line Items]    
Premiums 941 1,039
Operating Segments | Medicare stand-alone PDP | Group and Specialty    
Segment Reporting Information [Line Items]    
Premiums 0 0
Operating Segments | Medicare stand-alone PDP | Healthcare Services    
Segment Reporting Information [Line Items]    
Premiums 0 0
Operating Segments | Medicare stand-alone PDP | Individual Commercial    
Segment Reporting Information [Line Items]    
Premiums 0 0
Operating Segments | Total Medicare | Retail    
Segment Reporting Information [Line Items]    
Premiums 10,635 10,143
Operating Segments | Total Medicare | Group and Specialty    
Segment Reporting Information [Line Items]    
Premiums 0 0
Operating Segments | Total Medicare | Healthcare Services    
Segment Reporting Information [Line Items]    
Premiums 0 0
Operating Segments | Total Medicare | Individual Commercial    
Segment Reporting Information [Line Items]    
Premiums 0 0
Operating Segments | Fully-insured | Retail    
Segment Reporting Information [Line Items]    
Premiums 118 104
Operating Segments | Fully-insured | Group and Specialty    
Segment Reporting Information [Line Items]    
Premiums 1,378 1,337
Operating Segments | Fully-insured | Healthcare Services    
Segment Reporting Information [Line Items]    
Premiums 0 0
Operating Segments | Fully-insured | Individual Commercial    
Segment Reporting Information [Line Items]    
Premiums 283 893
Operating Segments | Specialty | Retail    
Segment Reporting Information [Line Items]    
Premiums 0 0
Operating Segments | Specialty | Group and Specialty    
Segment Reporting Information [Line Items]    
Premiums 322 318
Operating Segments | Specialty | Healthcare Services    
Segment Reporting Information [Line Items]    
Premiums 0 0
Operating Segments | Specialty | Individual Commercial    
Segment Reporting Information [Line Items]    
Premiums 0 0
Operating Segments | Medicaid and other | Retail    
Segment Reporting Information [Line Items]    
Premiums 653 630
Operating Segments | Medicaid and other | Group and Specialty    
Segment Reporting Information [Line Items]    
Premiums 0 5
Operating Segments | Medicaid and other | Healthcare Services    
Segment Reporting Information [Line Items]    
Premiums 0 0
Operating Segments | Medicaid and other | Individual Commercial    
Segment Reporting Information [Line Items]    
Premiums 0 0
Operating Segments | Provider | Retail    
Segment Reporting Information [Line Items]    
Services 0 0
Operating Segments | Provider | Group and Specialty    
Segment Reporting Information [Line Items]    
Services 0 0
Operating Segments | Provider | Healthcare Services    
Segment Reporting Information [Line Items]    
Services 70 71
Operating Segments | Provider | Individual Commercial    
Segment Reporting Information [Line Items]    
Services 0 0
Operating Segments | ASO and other | Retail    
Segment Reporting Information [Line Items]    
Services 2 1
Operating Segments | ASO and other | Group and Specialty    
Segment Reporting Information [Line Items]    
Services 161 177
Operating Segments | ASO and other | Healthcare Services    
Segment Reporting Information [Line Items]    
Services 0 1
Operating Segments | ASO and other | Individual Commercial    
Segment Reporting Information [Line Items]    
Services 0 0
Operating Segments | Pharmacy | Retail    
Segment Reporting Information [Line Items]    
Services 0 0
Operating Segments | Pharmacy | Group and Specialty    
Segment Reporting Information [Line Items]    
Services 0 0
Operating Segments | Pharmacy | Healthcare Services    
Segment Reporting Information [Line Items]    
Services 18 7
Operating Segments | Pharmacy | Individual Commercial    
Segment Reporting Information [Line Items]    
Services 0 0
Other Businesses    
Segment Reporting Information [Line Items]    
Premiums 9 10
Services 2 3
Revenues 11 13
Investment income 21 15
Total revenues 32 28
Benefits 29 25
Operating costs 4 4
Depreciation and amortization 0 0
Total operating expenses 33 29
Interest expense (1) (1)
Interest expense 0 0
Income (loss) before income taxes (1) (1)
Other Businesses | Individual Medicare Advantage    
Segment Reporting Information [Line Items]    
Premiums 0 0
Other Businesses | Group Medicare Advantage    
Segment Reporting Information [Line Items]    
Premiums 0 0
Other Businesses | Medicare stand-alone PDP    
Segment Reporting Information [Line Items]    
Premiums 0 0
Other Businesses | Total Medicare    
Segment Reporting Information [Line Items]    
Premiums 0 0
Other Businesses | Fully-insured    
Segment Reporting Information [Line Items]    
Premiums 0 0
Other Businesses | Specialty    
Segment Reporting Information [Line Items]    
Premiums 0 0
Other Businesses | Medicaid and other    
Segment Reporting Information [Line Items]    
Premiums 9 10
Other Businesses | Provider    
Segment Reporting Information [Line Items]    
Services 0 0
Other Businesses | ASO and other    
Segment Reporting Information [Line Items]    
Services 2 3
Other Businesses | Pharmacy    
Segment Reporting Information [Line Items]    
Services 0 0
Eliminations/ Corporate    
Segment Reporting Information [Line Items]    
Premiums 0 0
Services 0 0
Revenues 0 0
Investment income 45 46
Total revenues (5,822) (6,104)
Benefits (196) (212)
Operating costs (5,546) (5,897)
Merger termination fee and related costs, net (947) 34
Depreciation and amortization (24) (24)
Total operating expenses (6,713) (6,099)
Interest expense 891 (5)
Interest expense 49 47
Income (loss) before income taxes 842 (52)
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 | 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