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INCOME TAXES - Narrative (Details) $ in Millions, $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Aug. 08, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2019 USD ($) subsidiary | Dec. 31, 2019 CAD ($) subsidiary | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jan. 09, 2018 USD ($)
Income Tax [Line Items] |  |  |  |  |  |  |  |
Tax Act - provisional net tax benefits |  |  |  |  |  | $ 975 |  |
Tax Act - re-measurement of certain deferred tax assets and liabilities, income tax expense (benefit) |  |  |  |  |  | 774 |  |
Tax Act - one-time transition tax on certain foreign earnings, income tax expense (benefit) |  |  |  |  |  | 88 |  |
Tax Act - decrease in deferred tax asset attributable to certain legal accruals, income tax expense (benefit) |  |  |  |  |  | 10 |  |
Tax Act - Outside basis differences in certain foreign subsidiaries, provisional income tax expense (benefit) |  | $ (299) |  |  |  |  | $ 299 |
Net benefit related to the carryback of losses |  | 400 |  |  |  | 400 |  |
Reversal of previously established deferred tax liability, benefit |  |  |  |  |  | 1,900 |  |
Valuation allowance against deferred tax assets |  |  | $ 2,831 |  | $ 2,913 |  |  |
Provisional deferred tax benefit related to intentions to amend prior tax filings |  |  |  |  |  | 84 |  |
Unrecognized tax benefits including interest and penalties |  |  | 1,002 |  | 654 |  |  |
Portion of unrecognized tax benefits, if recognized, would affect the Company's effective tax rate |  |  | 355 |  | 345 |  |  |
Unrecognized tax benefits, net increase for tax positions of current year |  |  | 362 |  | 18 |  |  |
Unrecognized tax benefits, net decrease for tax positions of prior years |  |  | 13 |  |  |  |  |
Unrecognized tax benefits, net increase for tax positions of prior years |  |  |  |  | 38 |  |  |
Accrued interest and penalties related to unrecognized tax benefits |  |  | $ 45 |  | 42 |  |  |
Net increase (decrease) recognized in interest and penalties |  |  |  |  | 3 | 1 |  |
Number of subsidiaries file federal income tax returns in Canada, U.S., and other foreign jurisdictions (or more) | subsidiary |  |  | 1 | 1 |  |  |  |
Restricted cash |  | $ 77 | $ 1 |  | 2 | 77 |  | $ 77
Letter of credit |  |  |  |  |  |  |  | $ 77
Possible decrease in unrecognized tax benefits realized in next twelve months |  |  | 110 |  |  |  |  |
Tax Year 2013 |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |
Notice of tax assessment, aggregate amount of possible loss |  |  |  | $ 90 |  |  |  |
Canadian Federal and Provincial |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |
Increase (decrease) in valuation allowance |  |  | (82) |  | 912 |  |  |
Accumulated losses available for federal and provincial purposes |  |  | 7,441 |  | 5,655 |  |  |
Unclaimed investment tax credits and research and development credits |  |  | 34 |  | 34 |  |  |
Valuation allowance against deferred tax assets |  |  | 2,461 |  | 2,470 |  |  |
Canadian Federal and Provincial | Pooled Scientific Research and Experimental Development |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |
Tax credit carryforward |  |  | 192 |  | 192 |  |  |
United States - Federal |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |
Accumulated losses available for federal and provincial purposes |  |  | 636 |  | 1,552 |  |  |
Unclaimed investment tax credits and research and development credits |  |  | 106 |  | 97 |  |  |
Foreign tax credits reversal |  |  |  |  |  | $ 342 |  |
United States - Federal | Revenue Commissioners, Ireland |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |
Accumulated losses available for federal and provincial purposes |  |  | $ 6,765 |  |  |  |  |
Ireland | Revenue Commissioners, Ireland |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |
Accumulated losses available for federal and provincial purposes |  |  |  |  | $ 5,495 |  |  |
Ireland | Canada Revenue Agency |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |
Estimate of possible loss, amount not subject to full valuation allowance |  |  |  | 3 |  |  |  |
Ireland | Australian Taxation Office |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |
Notice of tax assessment, aggregate amount of possible loss | $ 117 |  |  |  |  |  |  |
Ireland | Tax Year 2012 | Canada Revenue Agency |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |
Notice of tax assessment, aggregate amount of possible loss |  |  |  | $ 85 |  |  |  |

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