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INCOME TAXES - Narrative (Details) € in Millions, $ in Millions, $ in Millions |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Nov. 08, 2022 EUR (€) | Aug. 08, 2017 USD ($) | Dec. 31, 2022 USD ($) subsidiary | Dec. 31, 2022 CAD ($) subsidiary | Dec. 31, 2021 USD ($) | Dec. 31, 2022 CAD ($)
Income Tax [Line Items] |  |  |  |  |  |
Valuation allowance against deferred tax assets |  |  | $ 2,023 |  | $ 2,222 |
Unrecognized tax benefits including interest and penalties |  |  | 881 |  | 927 |
Portion of unrecognized tax benefits, if recognized, would affect the Company's effective tax rate |  |  | 384 |  | 217 |
Unrecognized tax benefits, net increase for tax positions of current year |  |  | 156 |  | 79 |
Unrecognized tax benefits, net decrease for tax positions of prior years |  |  | 203 |  |  |
Unrecognized tax benefits, net increase for tax positions of prior years |  |  |  |  | 177 |
Accrued interest and penalties related to unrecognized tax benefits |  |  | 32 |  | 41 |
Net increase (decrease) recognized in interest and penalties |  |  | $ (9) |  | 8 |
Number of subsidiaries file federal income tax returns in Canada, U.S., and other foreign jurisdictions (or more) | subsidiary |  |  | 1 | 1 |  |
Estimate of possible loss, income tax examination (up to) |  |  | $ 2,100 |  |  |
Possible decrease in unrecognized tax benefits realized in next twelve months |  |  | 4 |  |  |
Tax Year 2013 |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Estimate of possible loss, income tax examination (up to) |  |  |  | $ 90 |  |
Canadian Federal and Provincial |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Decrease in valuation allowance |  |  | 199 |  | 30 |
Accumulated losses available for federal and provincial purposes |  |  | 5,878 |  | 6,669 |
Unclaimed investment tax credits and research and development credits |  |  | 27 |  | 31 |
Valuation allowance against deferred tax assets |  |  | 1,869 |  | 1,965 |
Canadian Federal and Provincial | Pooled Scientific Research and Experimental Development |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Tax credit carryforward |  |  | 188 |  | 196 |
United States - Federal |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Accumulated losses available for federal and provincial purposes |  |  | 241 |  | 266 |
Unclaimed investment tax credits and research and development credits |  |  | 75 |  | 119 |
Ireland | Revenue Commissioners, Ireland |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Accumulated losses available for federal and provincial purposes |  |  | $ 10,691 |  | $ 10,040 |
Ireland | Australian Taxation Office |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Estimate of possible loss, income tax examination (up to) |  | $ 117 |  |  |  |
Ireland | Tax Year 2005 through Tax Year 2009 | Canada Revenue Agency |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Reduction in NOLs |  |  |  |  |  | $ 44
Ireland | Tax Year 2012 | Canada Revenue Agency |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Estimate of possible loss, income tax examination (up to) |  |  |  | $ 85 |  |
Ireland | Tax Year 2015 | Canada Revenue Agency |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Reduction in NOLs |  |  |  |  |  | 21
Ireland | Tax Year 2016 | Canada Revenue Agency |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Reduction in NOLs |  |  |  |  |  | $ 23
Luxembourg | Tax Year 2018 and 2019 |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Estimate of possible loss, income tax examination (up to) | € | € 271.7 |  |  |  |  |

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