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FINANCIAL INSTRUMENTS - Scheduled Debt Repayments (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
May 02, 2013
Apr. 03, 2012
Sep. 30, 2008
Disclosure of detailed information about borrowings [line items]            
Borrowings $ 6,423,000,000 $ 7,931,000,000 $ 9,968,000,000      
Minimum annual payments under capital leases 46,000,000          
Other debt obligations            
Disclosure of detailed information about borrowings [line items]            
Borrowings 603,000,000 609,000,000 654,000,000      
Acacia credit facility            
Disclosure of detailed information about borrowings [line items]            
Borrowings 71,000,000 $ 99,000,000 $ 128,000,000      
2018            
Disclosure of detailed information about borrowings [line items]            
Minimum annual payments under capital leases 27,000,000          
2019            
Disclosure of detailed information about borrowings [line items]            
Minimum annual payments under capital leases 11,000,000          
2020            
Disclosure of detailed information about borrowings [line items]            
Minimum annual payments under capital leases 4,000,000          
2021            
Disclosure of detailed information about borrowings [line items]            
Minimum annual payments under capital leases 1,000,000          
2022            
Disclosure of detailed information about borrowings [line items]            
Minimum annual payments under capital leases 1,000,000          
2023 and thereafter            
Disclosure of detailed information about borrowings [line items]            
Minimum annual payments under capital leases 2,000,000          
Gross amount            
Disclosure of detailed information about borrowings [line items]            
Borrowings 6,410,000,000          
Gross amount | 4.95% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 248,000,000          
Gross amount | 7.31% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 7,000,000          
Gross amount | 4.40% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 629,000,000          
Gross amount | 3.85% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 337,000,000       $ 1,250,000,000.00  
Gross amount | 7.73% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 7,000,000          
Gross amount | 7.70% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 5,000,000          
Gross amount | 7.37% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 32,000,000          
Gross amount | 8.05% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 15,000,000          
Gross amount | 6.38% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 200,000,000          
Gross amount | 5.80% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 200,000,000          
Gross amount | 5.80% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 200,000,000          
Gross amount | 6.45% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 300,000,000          
Gross amount | 6.35% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 600,000,000          
Gross amount | 7.50% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 250,000,000         $ 250,000,000
Gross amount | 5.95% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 850,000,000          
Gross amount | 5.70% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 850,000,000          
Gross amount | 5.25% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 750,000,000       $ 750,000,000  
Gross amount | 5.75% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 850,000,000     $ 850,000,000    
Gross amount | Other debt obligations            
Disclosure of detailed information about borrowings [line items]            
Borrowings 9,000,000          
Gross amount | Acacia credit facility            
Disclosure of detailed information about borrowings [line items]            
Borrowings 71,000,000          
Gross amount | 2018            
Disclosure of detailed information about borrowings [line items]            
Borrowings 32,000,000          
Gross amount | 2018 | 4.95% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2018 | 7.31% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2018 | 4.40% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2018 | 3.85% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2018 | 7.73% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2018 | 7.70% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2018 | 7.37% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2018 | 8.05% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2018 | 6.38% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2018 | 5.80% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2018 | 5.80% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2018 | 6.45% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2018 | 6.35% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2018 | 7.50% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2018 | 5.95% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2018 | 5.70% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2018 | 5.25% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2018 | 5.75% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2018 | Other debt obligations            
Disclosure of detailed information about borrowings [line items]            
Borrowings 4,000,000          
Gross amount | 2018 | Acacia credit facility            
Disclosure of detailed information about borrowings [line items]            
Borrowings 28,000,000          
Gross amount | 2019            
Disclosure of detailed information about borrowings [line items]            
Borrowings 33,000,000          
Gross amount | 2019 | 4.95% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2019 | 7.31% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2019 | 4.40% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2019 | 3.85% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2019 | 7.73% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2019 | 7.70% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2019 | 7.37% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2019 | 8.05% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2019 | 6.38% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2019 | 5.80% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2019 | 5.80% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2019 | 6.45% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2019 | 6.35% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2019 | 7.50% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2019 | 5.95% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2019 | 5.70% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2019 | 5.25% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2019 | 5.75% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2019 | Other debt obligations            
Disclosure of detailed information about borrowings [line items]            
Borrowings 5,000,000          
Gross amount | 2019 | Acacia credit facility            
Disclosure of detailed information about borrowings [line items]            
Borrowings 28,000,000          
Gross amount | 2020            
Disclosure of detailed information about borrowings [line items]            
Borrowings 263,000,000          
Gross amount | 2020 | 4.95% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 248,000,000          
Gross amount | 2020 | 7.31% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2020 | 4.40% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2020 | 3.85% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2020 | 7.73% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2020 | 7.70% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2020 | 7.37% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2020 | 8.05% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2020 | 6.38% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2020 | 5.80% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2020 | 5.80% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2020 | 6.45% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2020 | 6.35% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2020 | 7.50% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2020 | 5.95% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2020 | 5.70% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2020 | 5.25% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2020 | 5.75% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2020 | Other debt obligations            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2020 | Acacia credit facility            
Disclosure of detailed information about borrowings [line items]            
Borrowings 15,000,000          
Gross amount | 2021            
Disclosure of detailed information about borrowings [line items]            
Borrowings 636,000,000          
Gross amount | 2021 | 4.95% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2021 | 7.31% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 7,000,000          
Gross amount | 2021 | 4.40% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 629,000,000          
Gross amount | 2021 | 3.85% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2021 | 7.73% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2021 | 7.70% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2021 | 7.37% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2021 | 8.05% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2021 | 6.38% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2021 | 5.80% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2021 | 5.80% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2021 | 6.45% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2021 | 6.35% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2021 | 7.50% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2021 | 5.95% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2021 | 5.70% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2021 | 5.25% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2021 | 5.75% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2021 | Other debt obligations            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2021 | Acacia credit facility            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2022            
Disclosure of detailed information about borrowings [line items]            
Borrowings 337,000,000          
Gross amount | 2022 | 4.95% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2022 | 7.31% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2022 | 4.40% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2022 | 3.85% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 337,000,000          
Gross amount | 2022 | 7.73% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2022 | 7.70% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2022 | 7.37% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2022 | 8.05% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2022 | 6.38% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2022 | 5.80% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2022 | 5.80% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2022 | 6.45% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2022 | 6.35% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2022 | 7.50% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2022 | 5.95% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2022 | 5.70% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2022 | 5.25% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2022 | 5.75% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2022 | Other debt obligations            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2022 | Acacia credit facility            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2023 and thereafter            
Disclosure of detailed information about borrowings [line items]            
Borrowings 5,109,000,000          
Gross amount | 2023 and thereafter | 4.95% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2023 and thereafter | 7.31% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2023 and thereafter | 4.40% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2023 and thereafter | 3.85% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2023 and thereafter | 7.73% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 7,000,000          
Gross amount | 2023 and thereafter | 7.70% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 5,000,000          
Gross amount | 2023 and thereafter | 7.37% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 32,000,000          
Gross amount | 2023 and thereafter | 8.05% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 15,000,000          
Gross amount | 2023 and thereafter | 6.38% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 200,000,000          
Gross amount | 2023 and thereafter | 5.80% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 200,000,000          
Gross amount | 2023 and thereafter | 5.80% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 200,000,000          
Gross amount | 2023 and thereafter | 6.45% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 300,000,000          
Gross amount | 2023 and thereafter | 6.35% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 600,000,000          
Gross amount | 2023 and thereafter | 7.50% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 250,000,000          
Gross amount | 2023 and thereafter | 5.95% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 850,000,000          
Gross amount | 2023 and thereafter | 5.70% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 850,000,000          
Gross amount | 2023 and thereafter | 5.25% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 750,000,000          
Gross amount | 2023 and thereafter | 5.75% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 850,000,000          
Gross amount | 2023 and thereafter | Other debt obligations            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2023 and thereafter | Acacia credit facility            
Disclosure of detailed information about borrowings [line items]            
Borrowings $ 0