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INCOME TAXES - Narrative (Details) $ in Millions, $ in Millions |  | 12 Months Ended
--- | --- | ---
Aug. 08, 2017 USD ($) | Dec. 31, 2020 USD ($) subsidiary | Dec. 31, 2020 CAD ($) subsidiary | Dec. 31, 2019 USD ($)
Income Tax [Line Items] |  |  |  |
Valuation allowance against deferred tax assets |  | $ 2,252 |  | $ 2,831
Unrecognized tax benefits including interest and penalties |  | 1,025 |  | 1,002
Portion of unrecognized tax benefits, if recognized, would affect the Company's effective tax rate |  | 414 |  | 355
Unrecognized tax benefits, net increase for tax positions of current year |  | 66 |  | 362
Unrecognized tax benefits, net decrease for tax positions of prior years |  | 42 |  |
Unrecognized tax benefits, net increase for tax positions of prior years |  |  |  | 13
Accrued interest and penalties related to unrecognized tax benefits |  | 49 |  | 45
Net increase (decrease) recognized in interest and penalties |  | $ 4 |  | 3
Number of subsidiaries file federal income tax returns in Canada, U.S., and other foreign jurisdictions (or more) | subsidiary |  | 1 | 1 |
Possible decrease in unrecognized tax benefits realized in next twelve months |  |  |  | 145
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] |  |  |  |
Decrease in valuation allowance |  | $ 579 |  | 82
Accumulated losses available for federal and provincial purposes |  | 6,530 |  | 7,441
Unclaimed investment tax credits and research and development credits |  | 37 |  | 34
Valuation allowance against deferred tax assets |  | 1,966 |  | 2,461
Canadian Federal and Provincial | Pooled Scientific Research and Experimental Development |  |  |  |
Income Tax [Line Items] |  |  |  |
Tax credit carryforward |  | 206 |  | 192
United States - Federal |  |  |  |
Income Tax [Line Items] |  |  |  |
Accumulated losses available for federal and provincial purposes |  | 814 |  | 636
Unclaimed investment tax credits and research and development credits |  | 110 |  | 106
United States - Federal | Revenue Commissioners, Ireland |  |  |  |
Income Tax [Line Items] |  |  |  |
Accumulated losses available for federal and provincial purposes |  | $ 8,387 |  |
Ireland | Revenue Commissioners, Ireland |  |  |  |
Income Tax [Line Items] |  |  |  |
Accumulated losses available for federal and provincial purposes |  |  |  | $ 6,765
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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