Summary of Significant Accounting Policies (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Receivables
Accounts Receivable, Allowance for Credit Loss	$ 100				$ 110				$ 100	$ 110
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense									47	$ 23	$ 26
Inventory Disclosure [Abstract]
Percentage of LIFO Inventory					10.00%					10.00%
Cost of products sold									(59,902)	$ (60,509)	(60,160)
Net Income (Loss) Attributable to Parent	$ 687	$ 225	$ 469	$ 391	$ 504	$ 407	$ 235	$ 233	$ 1,772	$ 1,379	$ 1,810
Diluted earnings per common share (dollars per share)	$ 1.22	$ 0.40	$ 0.84	$ 0.69	$ 0.90	$ 0.72	$ 0.42	$ 0.41	$ 3.15	$ 2.44	$ 3.19
Inventory, LIFO Reserve, Period Charge									$ 147
Inventory, LIFO Reserve, Period Charge, After-tax									$ 113
Inventory, LIFO Reserve, Period Charge, Per Share									$ 0.20
Property, Plant, and Equipment
Capitalized interest on major construction projects									$ 14	$ 15	$ 21
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Asset Impairment									26	11	9
Asset Abandonments and Write-Downs
Asset Abandonments and Impairments									28	131	100
Research and Development
Research and development expenses, net of expenditures subsequently reimbursed by government grants									160	154	141
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ (20,022)				$ (19,225)				(20,022)	(19,225)	(18,996)	$ (18,322)
Change in Accounting Principle, Other [Member]
Inventory Disclosure [Abstract]
Cost of products sold				$ 91
Net Income (Loss) Attributable to Parent				$ 69
Diluted earnings per common share (dollars per share)				$ 0.12
Reinvested Earnings [Member]
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ (19,780)								$ (19,780)		$ (18,527)	$ (17,552)
Accounting Standards Update 2019-05
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest					8					8
Accounting Standards Update 2019-05 | Reinvested Earnings [Member]
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest					$ 8					$ 8
Minimum [Member]
Goodwill and Intangible Assets Disclosure [Abstract]
Finite-Lived Intangible Asset, Useful Life									1 year
Minimum [Member] | Building [Member]
Property, Plant, and Equipment
Property, Plant and Equipment, Useful Life									15 years
Minimum [Member] | Machinery And Equipment [Member]
Property, Plant, and Equipment
Property, Plant and Equipment, Useful Life									3 years
Maximum [Member]
Goodwill and Intangible Assets Disclosure [Abstract]
Finite-Lived Intangible Asset, Useful Life									50 years
Maximum [Member] | Building [Member]
Property, Plant, and Equipment
Property, Plant and Equipment, Useful Life									40 years
Maximum [Member] | Machinery And Equipment [Member]
Property, Plant, and Equipment
Property, Plant and Equipment, Useful Life									40 years