Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	$ 3,279	$ 2,957
Current Assets
Accounts Receivable, Allowance for Credit Loss, Current	11	9
Cash and cash equivalents	955	463
Trade receivables - third party and affiliates	792	850
Property, Plant and Equipment, Net	3,939	3,713
Intangible assets, net	319	312
Other assets	$ 411	$ 338
Stockholders' Equity
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	100,000,000	100,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Treasury stock, shares	55,234,515	49,417,965
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	400,000,000	400,000,000
Common stock, shares issued	169,402,979	168,973,172
Common stock, shares outstanding	114,168,464	119,555,207