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SUPPLEMENTAL CASH FLOW (Cash Transactions) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Supplemental Cash Flow Information [Abstract]      
Interest, Net of Amounts Capitalized $ 61 $ 65 $ 83
Income Taxes $ 0 $ 0 $ 0