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LONG-TERM DEBT - Narrative (Details) | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 21, 2018 USD ($) | Mar. 21, 2018 CAD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2017 CAD ($) | Dec. 31, 2017 EUR (€) | May 31, 2017 USD ($) | May 31, 2017 CAD ($) | Dec. 31, 2016 CAD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  | $ 22,458,000,000 |  |  |  | $ 16,805,000,000
Letters of credit and guarantees outstanding |  |  |  |  | 866,000,000 |  |  |  |
Financial guarantees outstanding |  |  |  |  | 39,000,000 |  |  |  |
Bank credit facilities |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Maximum credit facility |  |  |  |  | 11,050,000,000 |  |  |  |
Undrawn borrowing facilities |  |  |  |  | 4,112,000,000 |  |  |  |
Demand credit facility |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Maximum credit facility |  |  |  |  | 100,000,000 | € 15,000,000 |  |  |
Non-revolving term credit facility maturing February 2019 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Maximum credit facility |  |  |  |  | 750,000,000 |  |  |  |
125 million non-revolving term credit facility maturing February 2019 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Maximum credit facility |  |  |  |  | 125,000,000 |  |  |  |
Non-revolving term credit facility maturing October 2019 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Maximum credit facility |  |  |  |  | 2,200,000,000 |  |  |  | $ 1,500,000,000
Borrowings |  |  |  |  | 2,200,000,000 |  |  |  |
Non-revolving term credit facility maturing May 2020 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Maximum credit facility |  |  |  |  | 3,000,000,000 |  |  |  |
Borrowings |  |  |  |  | $ 3,000,000,000 |  |  |  |
Amortisation rate |  |  | 5.00% |  | 5.00% | 5.00% |  |  |
Letter of credit |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Maximum credit facility |  |  | $ 375,000,000 |  |  |  |  |  |
Revolving syndicated credit facility maturing June 2020 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Maximum credit facility |  |  |  |  | $ 2,425,000,000 |  |  |  |
Revolving syndicated credit facility |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Maximum credit facility |  |  |  |  | 2,425,000,000 |  |  |  |
Revolving syndicated credit facility maturing June 2019 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Maximum credit facility |  |  |  |  | 330,000,000 |  |  |  |
Undrawn borrowing facilities |  |  |  |  | 330,000,000 |  |  |  |
Revolving syndicated credit facility maturing June 2021 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Maximum credit facility |  |  |  |  | $ 2,095,000,000 |  |  |  |
Commercial paper (December 31, 2017 - US$500 million; December 31, 2016 - US$250 million) |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Maximum credit facility |  |  | 2,500,000,000 |  |  |  |  |  |
Notional amount |  |  | $ 500,000,000 | $ 250,000,000 |  |  |  |  |
Credit facilities and commercial paper | Weighted average |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  | 2.20% | 1.90% | 2.20% | 2.20% |  |  | 1.90%
Long-term debt | Weighted average |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  | 3.80% | 3.90% | 3.80% | 3.80% |  |  | 3.90%
2.05% debentures due June 1, 2020 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  | 2.05% |  | 2.05% | 2.05% |  |  |
Notional amount |  |  |  |  | $ 900,000,000 |  |  |  |
3.42% debentures due December 1, 2026 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  | 3.42% |  | 3.42% | 3.42% |  |  |
Notional amount |  |  |  |  | $ 600,000,000 |  |  |  |
4.85% debentures due May 30, 2047 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  | 4.85% |  | 4.85% | 4.85% |  |  |
Notional amount |  |  |  |  | $ 300,000,000 |  |  |  |
Medium-Term Borrowings Expiring August 2019 [Member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Base shell prospectus borrowings |  |  |  |  | $ 3,000,000,000 |  |  |  |
3.31% debentures due February 11, 2022 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  | 3.31% |  | 3.31% | 3.31% |  |  |
Notional amount |  |  |  |  | $ 1,000,000,000 |  |  |  |
5.70% due May 15, 2017 (US$1,100 million) |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  | 5.70% |  | 5.70% | 5.70% |  |  |
Notional amount |  |  | $ 1,100,000,000 |  |  |  |  |  |
Repayment of borrowings |  |  | $ 1,100,000,000 |  |  |  |  |  |
2.95% due January 15, 2023 (US$1,000 million) |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  | 2.95% |  | 2.95% | 2.95% |  |  |
Notional amount |  |  | $ 1,000,000,000 |  |  |  |  |  |
3.85% due June 1, 2027 (US$1,250 million) |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  | 3.85% |  | 3.85% | 3.85% |  |  |
Notional amount |  |  | $ 1,250,000,000 |  |  |  |  |  |
4.95% due June 1, 2047 (US$750 million) |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  | 4.95% |  | 4.95% | 4.95% |  |  |
Notional amount |  |  | $ 750,000,000 |  |  |  |  |  |
US dollar denominated debt, unsecured |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Base shell prospectus borrowings |  |  | $ 3,000,000,000 |  |  |  |  |  |
Three-month LIBOR plus 0.375% |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Repayment of borrowings |  |  |  | $ 500,000,000 |  |  |  |  |
Three-month LIBOR plus 0.375% | LIBOR |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 0.375% |  |  |  |  | 0.375%
6% Notes |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  | 6.00% |  |  |  |  | 6.00%
Repayment of borrowings |  |  |  | $ 250,000,000 |  |  |  |  |
1.75% due January 15, 2018 (US$600 million) |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  | 1.75% |  | 1.75% | 1.75% |  |  |
Notional amount |  |  | $ 600,000,000 |  |  |  |  |  |
5.90% due February 1, 2018 (US$400 million) |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  | 5.90% |  | 5.90% | 5.90% |  |  |
Notional amount |  |  | $ 400,000,000 |  |  |  |  |  |
North Sea |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  |  | $ 63,000,000 |  |  |  |
AOSP |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  |  | $ 651,000,000 |  |  |  |
AOSP | Non-revolving term credit facility maturing May 2020 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Maximum credit facility |  |  |  |  |  |  |  | $ 3,000,000,000 |
AOSP | Long-term debt |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  | $ 3,000,000,000 |  |
AOSP | Medium-term notes |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  | $ 1,800,000,000 |
Major debt transactions | 125 million non-revolving term credit facility maturing February 2019 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Repayment of borrowings |  | $ 125,000,000 |  |  |  |  |  |  |
Major debt transactions | Non-revolving term credit facility maturing February 2021 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Maximum credit facility |  | 750,000,000 |  |  |  |  |  |  |
Major debt transactions | Non-revolving term credit facility maturing May 2020 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings |  | 2,850,000,000 |  |  |  |  |  |  |
Repayment of borrowings |  | $ 150,000,000 |  |  |  |  |  |  |
Major debt transactions | 1.75% due January 15, 2018 (US$600 million) |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Repayment of borrowings | $ 600,000,000 |  |  |  |  |  |  |  |
Major debt transactions | 5.90% due February 1, 2018 (US$400 million) |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Repayment of borrowings | $ 400,000,000 |  |  |  |  |  |  |  |

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