Basis of Presentation Basis of Presentation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	$ 113			$ 113		$ 110
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense	14		$ 7	25	$ 7
Percentage of LIFO Inventory						10.00%
Cost of Revenue	(15,173)		(15,325)	(29,192)	(29,701)
Net Income (Loss) Attributable to Noncontrolling Interest	$ 3		$ 3	$ 3	$ 4
Earnings Per Share, Diluted	$ 0.84		$ 0.42	$ 1.53	$ 0.83
Inventory, LIFO Reserve, Period Charge	$ 1			$ (43)
Inventory, LIFO Reserve, Period Charge (Income), after tax	$ 1			$ (33)
Inventory, LIFO Reserve, Period Charge (Income), per share	$ 0.00			$ (0.06)
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 Noncontrolling Interest		$ 69
Earnings Per Share, Diluted		$ 0.12