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DEBT - Credit Facilities (Narrative) (Details) |  |  |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 10, 2021 USD ($) | Jul. 24, 2020 CAD ($) | Feb. 25, 2020 USD ($) creditFacility | Feb. 24, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 CAD ($) | Apr. 09, 2020 CAD ($) | Mar. 31, 2020 CAD ($) | Dec. 31, 2019 CAD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  | $ 62,819,000,000 |  |  | $ 59,661,000,000
Extinguishment of debt |  |  |  |  | $ 2,100,000,000 | 1,700,000,000 |  |  |
Commercial paper and credit facility draws |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  | 9,900,000,000 |  |  | 9,000,000,000.0
Non-revolving, bilateral credit facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Term of credit facility |  |  | 1 year |  |  |  |  |  |
Credit facility capacity |  |  | $ 500,000,000 |  |  |  |  |  |
Number of credit facilities | creditFacility |  |  | 2 |  |  |  |  |  |
Uncommitted credit facilities |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Credit facility capacity |  |  |  |  |  | 849,000,000 |  |  | 916,000,000
Unutilized credit facility |  |  |  |  |  | $ 533,000,000 |  |  | $ 476,000,000
Weighted average standby fee (as a percent) |  |  |  |  | 30.00% | 30.00% |  |  |
Non-revolving Credit Facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Term of credit facility |  |  |  | 2 years |  |  |  |  |
Credit facility capacity |  |  |  | $ 1,000,000,000.0 |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Credit facility capacity |  |  |  |  |  |  | $ 3,000,000,000.0 | $ 1,700,000,000 |
Revolving Credit Facility | Extendible credit facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Term of credit facility |  | 364 days |  |  |  |  |  |  |
Borrowing capacity |  | $ 10,000,000,000.0 |  |  |  |  |  |  |
Maturity period |  | 1 year |  |  |  |  |  |  |
Revolving Credit Facility | Subsequent Event | Sustainability-linked Credit Facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Term of credit facility | 3 years |  |  |  |  |  |  |  |
Credit facility capacity | $ 1,000,000,000.0 |  |  |  |  |  |  |  |
Revolving Credit Facility | Subsequent Event | Syndicated Credit Facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Term of credit facility | 1 year |  |  |  |  |  |  |  |
Extinguishment of debt | $ 3,000,000,000.0 |  |  |  |  |  |  |  |

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- Definition Credit Facility, Number of Credit Facilities + References No definition available. + Details
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- Definition Line of Credit Facility, Maturity Date, Term Out Provision + References No definition available. + Details
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- Definition Line of Credit Facility, Maximum Borrowing Capacity, Amount Extended + References No definition available. + Details
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X
- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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