Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019	Dec. 31, 2016
Significant Accounting Policies [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption					$ 7
Reclassifications
Defined benefit plan net periodic benefit cost (income) other than service cost	$ (15)	$ (10)	$ (27)
Receivables
Accounts Receivable, Allowance for Credit Loss		84
Document Period End Date	Dec. 31, 2019
Trade accounts receivable due from unconsolidated affiliates	$ 156	146
Property, Plant, and Equipment
Capitalized interest on major construction projects	15	21	17
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Asset Impairment	11	9	0
Asset Abandonments and Write-Downs
Asset Abandonments and Impairments	131	100	101
Other Asset Impairment Charges	131	121	101
Revenues
Revenues from unconsolidated affiliates	4,900	5,600	5,200
Research and Development
Research and development expenses, net of expenditures subsequently reimbursed by government grants	154	141	$ 129
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Operating Lease, Right-of-Use Asset	971
Operating Lease, Liability	$ 996
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Operating Lease, Right-of-Use Asset				$ 793
Operating Lease, Liability				$ 795
Corporate [Member]
Asset Abandonments and Write-Downs
Other Asset Impairment Charges		$ 49
Minimum [Member]
Goodwill and Intangible Assets Disclosure [Abstract]
Finite-Lived Intangible Asset, Useful Life	2 years
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