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SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) shares in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) segment shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |
Cash and cash equivalents | $ 438,000,000 | $ 405,000,000 |  |
Decrease to pre-tax income | 60,000,000 | (345,000,000) | $ 958,000,000 |
Decrease to net income | 83,000,000 | (263,000,000) | 1,011,000,000 |
Cost of inventories determined by LIFO method | 3,000,000 | 5,000,000 |  |
Cost of inventories determined by LIFO method, amount of increase if FIFO method was used | 22,000,000 | 14,000,000 |  |
Foreign currency translation gain (loss) | 182,000,000 | (83,000,000) | (180,000,000) |
Stockholders' equity | 4,970,000,000 | 5,095,000,000 | 5,133,000,000 | $ 6,628,000,000
Net exchange gains (losses) | (13,000,000) | (27,000,000) | 6,000,000 |
R&D costs included in selling, general and administrative expenses | $ 115,000,000 | 131,000,000 | 161,000,000 |
Adjusted operating income margin target, achievement period for vesting | 12 months |  |  |
Operating income margin and target threshold measurement period | 12 months |  |  |
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture | shares | 3 |  |  |
Goodwill | $ 3,986,000,000 | 3,397,000,000 | 3,431,000,000 |
Number of reportable segments | segment | 2 |  |  |
Restatement Adjustment |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Decrease to pre-tax income | $ 9,000,000 |  |  |
Decrease to net income | 7,000,000 |  |  |
Straight Smile LLC |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Total acquisition consideration | 1,000,000,000.0 |  |  |
Goodwill | 631,000,000 |  |  |
Intangible assets | 416,000,000 |  |  |
Various Credit Facilities | Line of Credit |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Credit facilities, maximum borrowing capacity | 400,000,000 |  |  |
Line of Credit | 2018 Revolving Credit Facility |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Credit facilities, maximum borrowing capacity | $ 700,000,000 |  |  |
Restricted Stock Units (RSUs) |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Exercisable period following death, disability or qualified retirement | 1 year |  |  |
Employee Stock Option |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Award expiration period | 10 years |  |  |
Accrued Liabilities |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Deferred revenue | $ 41,000,000 | 29,000,000 |  |
Gain and (Loss) on Cash Flow Hedges |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Foreign currency translation gain (loss) |  | 4,000,000 |  |
Gain and (Loss) on Cash Flow Hedges | Hedges of Net Investments |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Foreign currency translation gain (loss) | (54,000,000) |  |  |
Foreign Currency Translation Gain (Loss) |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Stockholders' equity | (187,000,000) | (368,000,000) | (284,000,000) |
Foreign currency translation adjustments recorded in AOCI net of tax effects |  | (87,000,000) |  |
Accumulated foreign currency adjustment, translation gain (loss) |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Stockholders' equity | (25,000,000) | (260,000,000) |  |
Accumulated foreign currency adjustment, translation gain (loss) | Hedges of Net Investments |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Stockholders' equity | $ 235,000,000 |  |  |
Building |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Useful life (in years) | 40 years |  |  |
Machinery and equipment | Minimum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Useful life (in years) | 4 years |  |  |
Machinery and equipment | Maximum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Useful life (in years) | 15 years |  |  |
Allowance for doubtful accounts |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Allowance for Sirona opening balance | $ 18,000,000 | 29,000,000 | 25,000,000 | $ 22,000,000
Allowance for doubtful accounts receivable, write-offs | 12,000,000 | 6,000,000 |  |
Additions - charged (credited) to costs and expenses | $ 1,000,000 | $ 10,000,000 | $ 6,000,000 |

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