Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Supplemental Cash Flow Information [Abstract]
Cash paid during the period for interest, net of amounts capitalized	$ 163	$ 15
Balance in property, plant and equipment, net funded with accounts payable and accrued liabilities	$ 503	$ 577