Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Supplemental Cash Flow Information [Abstract]
Cash paid during the period for interest on debt, net of amounts capitalized	$ 295	$ 108
Cash paid for income taxes	1	20
Balance in property, plant and equipment, net funded with accounts payable and accrued liabilities	$ 255	$ 509