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FINANCIAL INSTRUMENTS - Debt Narrative (Details) - USD ($) |  |  |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2020 | May 02, 2013 | Oct. 16, 2009 | Jan. 31, 2013 | Sep. 30, 2008 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Nov. 30, 2019 | Apr. 03, 2012 | Jun. 30, 2011
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  | $ 5,536,000,000 | $ 5,738,000,000 | $ 6,423,000,000 |  |  |  |  |
Repayments |  |  |  |  |  | 281,000,000 | 687,000,000 |  |  |  |  |  |
BNAF Notes Due 2021 |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate (as percent) |  |  |  |  |  |  |  |  |  |  |  |  | 4.40%
Repayments |  |  |  |  |  |  | 0 |  | $ 721,000,000 |  |  |  |
BNAF Notes Due 2041 |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate (as percent) |  |  |  |  |  |  |  |  |  |  |  |  | 5.70%
Borrowings |  |  |  |  |  | $ 850,000,000 | 850,000,000 |  |  |  |  |  |
3.85%/5.25% Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate (as percent) |  |  |  |  |  | 385.00% |  |  |  |  |  |  |
Borrowings |  |  |  |  |  | $ 1,079,000,000 | 1,079,000,000 | 1,079,000,000 |  |  |  |  |
Repayments |  |  |  |  |  | $ 0 | $ 0 |  |  |  |  |  |
Effective rate (as percent) |  |  |  |  |  | 4.87% | 4.87% |  |  |  |  |  |
3.85% Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate (as percent) | 3.85% |  |  |  |  |  |  |  |  |  |  | 3.85% |
Repayments | $ 337,000,000 |  |  |  |  |  |  |  |  | $ 913,000,000 |  |  |
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 |  |  |  |  |  | $ 1,080,000,000 | $ 1,326,000,000 | 1,326,000,000 |  |  |  |  |
Repayments |  |  |  |  |  | $ 248,000,000 | $ 0 |  |  |  |  |  |
Effective rate (as percent) |  |  |  |  |  | 6.33% | 6.16% |  |  |  |  |  |
BPADF Notes Due 2039 |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate (as percent) |  |  | 5.95% |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  | $ 850,000,000 | $ 850,000,000 |  |  |  |  |  |
Term of borrowings |  |  | 30 years |  |  |  |  |  |  |  |  |  |
BPDAF Notes Due 2019 |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate (as percent) |  |  | 4.95% |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  | 0 | 248,000,000 |  |  |  |  |  |
Repayments |  |  |  |  |  | $ 248,000,000 |  |  | 152,000,000 |  |  |  |
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) |  |  |  |  |  |  |  |  |  |  | 1.25% |  |
Commitment fee (as percent) |  |  |  |  |  | 0.15% |  |  |  |  |  |  |
Credit Facility Due 2021 |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments |  | $ 2,000,000,000 |  |  |  |  |  |  |  |  |  |  |
4.10%/5.75% notes |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  | $ 842,000,000 | 842,000,000 | 842,000,000 |  |  |  |  |
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 |  |  |  |  |  | 14,000,000 | 43,000,000 | 71,000,000 |  |  |  |  |
Repayments | $ 14,000,000 |  |  |  |  | $ 29,000,000 | $ 28,000,000 | $ 28,000,000 | $ 29,000,000 | $ 14,000,000 |  |  |
Term of borrowings |  |  |  | 7 years |  |  |  |  |  |  |  |  |
Repayment holiday period |  |  |  | 2 years |  |  |  |  |  |  |  |  |
Effective rate (as percent) |  |  |  |  |  | 3.36% | 3.59% |  |  |  |  |  |
Gross amount |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  | $ 5,467,000,000 |  |  |  |  |  |  |
Gross amount | BNAF Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,000,000,000
Gross amount | BNAF Notes Due 2021 |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  | 1,350,000,000.00
Gross amount | BNAF Notes Due 2041 |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  | $ 850,000,000
Gross amount | 3.85%/5.25% Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000,000 |
Gross amount | 3.85% Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  | 337,000,000 |  |  |  |  |  | 1,250,000,000 |
Gross amount | 5.25% Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  | 750,000,000 |  |  |  |  |  | $ 750,000,000 |
Gross amount | Other fixed rate notes |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  | $ 1,250,000,000 |  |  |  |  |  |  |  |  |  |
Gross amount | BPADF Notes Due 2039 |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  | 850,000,000 |  |  |  |  |  |  |  |  |  |
Gross amount | BPDAF Notes Due 2019 |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  | $ 400,000,000 |  |  |  |  |  |  |  |  |  |
Gross amount | LLCs Notes Due 2013, Due 2019 and Due 2038 |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  | $ 1,250,000,000 |  |  |  |  |  |  |  |
Gross amount | 7.50% Notes Due 2038 |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  | $ 250,000,000 | 250,000,000 |  |  |  |  |  |  |
Gross amount | Credit Facility Due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility available |  |  |  |  |  |  |  |  |  |  | $ 3,000,000,000 |  |
Gross amount | 4.10%/5.75% notes |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  | $ 3,000,000,000 |  |  |  |  |  |  |  |  |  |  |
Gross amount | 5.75% Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  | $ 850,000,000 |  |  |  | 850,000,000 |  |  |  |  |  |  |
Gross amount | Acacia Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  | $ 14,000,000 |  |  |  |  |  |  |
Credit facility available |  |  |  | $ 142,000,000 |  |  |  |  |  |  |  |  |
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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