Basis of Presentation Basis of Presentation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	$ 105			$ 105		$ 110
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense	7		$ 3	32	$ 10
Percentage of LIFO Inventory						10.00%
Cost of Revenue	(14,084)		(15,648)	(43,276)	(45,349)
Net Income (Loss) Attributable to Parent	$ 225		$ 407	$ 1,085	$ 875
Earnings Per Share, Diluted	$ 0.40		$ 0.72	$ 1.93	$ 1.55
Inventory, LIFO Reserve, Period Charge	$ 50			$ 7
Inventory, LIFO Reserve, Period Charge (Income), after tax	$ 38			$ 5
Inventory, LIFO Reserve, Period Charge (Income), per share	$ 0.07			$ 0.01
Change in Accounting Principle, Other [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of Revenue		$ 91
Net Income (Loss) Attributable to Parent		$ 69
Earnings Per Share, Diluted		$ 0.12