Property, Plant and Equipment - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Total capital expenditures	$ 925	$ 1,095	$ 1,014
Accrued capital expenditures unpaid	334	331	357
Asset impairments and accelerated depreciation	109	141	334
Simplify to Grow Program
Property, Plant and Equipment [Line Items]
Asset impairments and accelerated depreciation	$ 50	$ 59	$ 206