Basis of Presentation Basis of Presentation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	$ 98		$ 100
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense	4	$ 11
Percentage of LIFO Inventory				10.00%
Cost of Revenue	(17,345)	(14,019)
Net Income (Loss) Attributable to Parent	$ 689	$ 391
Earnings Per Share, Diluted	$ 1.22	$ 0.69
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ (20,861)	$ (18,976)	(20,022)	$ (19,225)
Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ (20,261)	(19,026)	$ (19,780)	(18,958)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest				$ 8
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