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SIGNIFICANT ACCOUNTING POLICIES - Income Taxes (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Increase to deferred income taxes | $ 1,690 | $ 1,676 |
Tax benefit recognition, measurement percentage (greater than) | 50.00% |  |
Minimum period to classify uncertain tax position liabilities as long term liabilities | 1 year |  |
Accounting Standards Update 2016-16 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Increase to deferred income taxes |  |  | $ 1,209

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