Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Allowance for accounts and notes receivable	$ 41	$ 22
Common Stock, shares authorized (in shares)	2,500,000,000	2,500,000,000
Common Stock, Par Value (in USD per share)	$ 0.01	$ 0.01
Common Stock, shares issued (in shares)	647,416,633	645,691,761
Treasury Stock, shares repurchased (in shares)	206,390,806	189,526,331