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Basis of Presentation - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts and notes receivable, net, allowance for credit losses	$ 199			$ 101	$ 82
Deferred tax liabilities	146				290
Stockholder's equity	229	$ (79)	$ (20)		703	$ 838	$ 1,240	$ 1,603	$ 2,225
Change in allowance for credit losses from COVID-19	122
Adoption of ASU 2016-13 \| Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts and notes receivable, net, allowance for credit losses				19
Deferred tax liabilities				(4)
Stockholder's equity					(15)
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholder's equity	$ 9,370	$ 9,270	$ 9,504		9,644	$ 9,522	$ 9,292	$ 9,219	$ 8,982
Retained Earnings \| Adoption of ASU 2016-13 \| Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholder's equity				$ 15	$ (15)