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DEBT - Credit Facilities (Narrative) (Details) |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 18, 2019 CAD ($) | May 16, 2019 CAD ($) | Feb. 08, 2019 CAD ($) | Dec. 31, 2019 CAD ($) | May 16, 2019 JPY (¥) | Dec. 31, 2018 CAD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of credit facility, increase (decrease) |  |  | $ 444,000,000 |  |  |
Weighted average standby fee (as a percent) |  |  |  | 0.10% |  |
Long-term debt |  |  |  | $ 59,661,000,000 |  | $ 60,327,000,000
Commercial paper and credit facility draws |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Long-term debt |  |  |  | 8,974,000,000 |  | 7,967,000,000
Extendible credit facility |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Term of credit facility |  | 3 years |  |  |  |
Credit facility capacity |  | $ 641,000,000 |  |  | ¥ 52,500,000,000 |
Non-revolving, bilateral credit facility |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Term of credit facility | 5 years |  |  |  |  |
Credit facility capacity | $ 500,000,000 |  |  |  |  |
Uncommitted credit facilities |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Credit facility capacity |  |  |  | 916,000,000 |  | 807,000,000
Unutilized credit facility |  |  |  | $ 476,000,000 |  | $ 548,000,000

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 Amount of increase (decrease) of the credit facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + 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=6877327&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=6877327&loc=d3e13212-122682 + Details
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X
- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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- Definition Amount of long-term debt and lease obligation, classified as noncurrent. + 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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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