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FINANCIAL INSTRUMENTS - Debt Narrative (Details) - USD ($) $ in Millions |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2020 | May 02, 2013 | Oct. 16, 2009 | Jan. 31, 2013 | Sep. 30, 2008 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Nov. 30, 2019 | Jun. 30, 2012 | Apr. 03, 2012 | Sep. 30, 2009
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  | $ 5,155 | $ 5,536 | $ 5,738 |  |  |  |  |  |  |
Repayments |  |  |  |  |  | 353 | 281 |  |  |  |  |  |  |  |
5.7% notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate (as percent) |  |  |  |  |  |  |  |  |  |  |  |  | 5.70% |  |
Borrowings |  |  |  |  |  | 842 | 842 | 842 |  |  |  |  |  |  |
Repayments |  |  |  |  |  | $ 0 | $ 0 |  |  |  |  |  |  |  |
Effective rate (as percent) |  |  |  |  |  | 5.73% | 5.74% |  |  |  |  |  |  |  |
3.85%/5.25% Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate (as percent) |  |  |  |  |  | 385.00% |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  | $ 744 | $ 1,079 | 1,079 |  |  |  |  |  |  |
Repayments |  |  |  |  |  | $ 337 | $ 0 |  |  |  |  |  |  |  |
Effective rate (as percent) |  |  |  |  |  | 5.31% | 4.87% |  |  |  |  |  |  |  |
3.85% Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate (as percent) | 3.85% |  |  |  |  |  |  |  |  |  |  |  |  | 3.85% |
Repayments | $ 337 |  |  |  |  |  |  |  |  | $ 913 |  |  |  |  |
5.25% Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate (as percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.25% |
Other fixed rate notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  | $ 1,081 | $ 1,080 | 1,326 |  |  |  |  |  |  |
Repayments |  |  |  |  |  | $ 0 | $ 248 |  |  |  |  |  |  |  |
Effective rate (as percent) |  |  |  |  |  | 6.38% | 6.33% |  |  |  |  |  |  |  |
BPADF Notes Due 2039 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate (as percent) |  |  | 5.95% |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  | $ 850 | $ 850 |  |  |  |  |  |  |  |
Term of borrowings |  |  | 30 years |  |  |  |  |  |  |  |  |  |  |  |
BPDAF Notes Due 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate (as percent) |  |  | 4.95% |  |  |  |  |  |  |  |  |  |  |  |
Repayments |  |  |  |  |  | $ 248 |  |  | $ 152 |  |  |  |  |  |
Term of borrowings |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |
7.50% Notes Due 2038 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate (as percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.50%
Term of borrowings |  |  |  |  | 30 years |  |  |  |  |  |  |  |  |  |
Credit Facility Due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread (as percent) |  |  |  |  |  |  |  |  |  |  |  | 1.125% |  |  |
Commitment fee (as percent) |  |  |  |  |  | 0.125% |  |  |  |  |  |  |  |  |
Credit Facility Due 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments |  | $ 2,000 |  |  |  |  |  |  |  |  |  |  |  |  |
4.10%/5.75% notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  | $ 843 | 842 | 842 |  |  |  |  |  |  |
Repayments |  |  |  |  |  | 0 | 0 |  |  |  |  |  |  |  |
5.75% Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate (as percent) |  | 5.75% |  |  |  |  |  |  |  |  |  |  |  |  |
Acacia Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  | 0 | 14 | 43 |  |  |  |  |  |  |
Repayments | $ 14 |  |  |  |  | $ 14 | $ 29 | $ 28 | $ 28 | $ 29 | $ 14 |  |  |  |
Term of borrowings |  |  |  | 7 years |  |  |  |  |  |  |  |  |  |  |
Repayment holiday period |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |
Effective rate (as percent) |  |  |  |  |  | 0.00% | 3.36% |  |  |  |  |  |  |  |
Gross amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  | $ 5,116 |  |  |  |  |  |  |  |  |
Gross amount | BNAF Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,000 |  |
Gross amount | 5.7% notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  | $ 850 |  |
Gross amount | 3.85%/5.25% Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000 |
Gross amount | 3.85% Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,250 |
Gross amount | 5.25% Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  | 750 |  |  |  |  |  |  |  | $ 750 |
Gross amount | Other fixed rate notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  | $ 1,250 |  |  |  |  |  |  |  |  |  |  |  |
Gross amount | BPADF Notes Due 2039 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  | 850 |  |  |  |  |  |  |  |  |  |  |  |
Gross amount | BPDAF Notes Due 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  | $ 400 |  |  |  |  |  |  |  |  |  |  |  |
Gross amount | LLCs Notes Due 2013, Due 2019 and Due 2038 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,250
Gross amount | 7.50% Notes Due 2038 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  | 250 |  |  |  |  |  |  |  |  | $ 250
Gross amount | Credit Facility Due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility available |  |  |  |  |  | 3,000 |  |  |  |  |  |  |  |  |
Gross amount | 4.10%/5.75% notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  | $ 3,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Gross amount | 5.75% Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  | $ 850 |  |  |  | $ 850 |  |  |  |  |  |  |  |  |
Gross amount | Acacia Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility available |  |  |  | $ 142 |  |  |  |  |  |  |  |  |  |  |
Acacia Credit Facility Floating Interest Rate | Acacia Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread (as percent) |  |  |  | 2.50% |  |  |  |  |  |  |  |  |  |  |

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