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FINANCIAL INSTRUMENTS - Debt and Interest (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Disclosure of detailed information about borrowings [line items]    
Borrowings $ 6,392 $ 6,423
Less: current portion 680 59
Debt (note 14B) 5,712 6,364
BNAF Notes Due 2021 and 2041 [Member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings 1,469 1,468
3.85%/5.25% notes    
Disclosure of detailed information about borrowings [line items]    
Borrowings 1,079 1,079
5.80% notes    
Disclosure of detailed information about borrowings [line items]    
Borrowings 395 395
6.35% notes    
Disclosure of detailed information about borrowings [line items]    
Borrowings 594 593
Other fixed rate notes    
Disclosure of detailed information about borrowings [line items]    
Borrowings 1,326 1,326
Capital Leases [Member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings 31 46
Less: current portion 21 27
Other Debt Obligations [Member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings 599 603
Less: current portion 4 4
Acacia Credit Facility    
Disclosure of detailed information about borrowings [line items]    
Borrowings 57 71
Less: current portion $ 28 $ 28