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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reclassifications          
Cash Flows Between Transferor and Transferee, Beneficial Interest     $ 7,800 $ 8,200 $ 8,100
Receivables          
Allowance for Doubtful Accounts Receivable $ 84   84 73  
Trade accounts receivable due from unconsolidated affiliates 161   161 343  
Property, Plant, and Equipment          
Capitalized interest on major construction projects     21 17 20
Goodwill and Intangible Assets Disclosure [Abstract]          
Goodwill and Intangible Asset Impairment     9 0 11
Asset Abandonments and Write-Downs          
Asset Abandonments and Impairments     100 101 17
Revenues          
Revenues from unconsolidated affiliates     6,800 6,000 4,200
Research and Development          
Research and development expenses, net of expenditures subsequently reimbursed by government grants     141 129 123
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]          
Cumulative Effect of New Accounting Principle in Period of Adoption         (7)
Other Asset Impairment Charges     $ 121 101 17
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    
Nonoperating Income (Expense) [Member]          
Reclassifications          
Defined benefit plan net periodic benefit cost (income) other than service cost     $ (10)    
Cost Of Products Sold [Member]          
Reclassifications          
Defined benefit plan net periodic benefit cost (income) other than service cost       12 (1)
Selling, General and Administrative Expenses [Member]          
Reclassifications          
Defined benefit plan net periodic benefit cost (income) other than service cost       $ 15 (1)
Accounting Standards Update 2014-09 [Member]          
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]          
Less than   less than      
Cumulative Effect of New Accounting Principle in Period of Adoption   $ 1      
Other Noncurrent Assets [Member] | Accounting Standards Update 2016-02 [Member] | Minimum [Member]          
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]          
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification 700        
Other Noncurrent Assets [Member] | Accounting Standards Update 2016-02 [Member] | Maximum [Member]          
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]          
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification 800        
Other Noncurrent Liabilities [Member] | Accounting Standards Update 2016-02 [Member] | Minimum [Member]          
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]          
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification 700        
Other Noncurrent Liabilities [Member] | Accounting Standards Update 2016-02 [Member] | Maximum [Member]          
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]          
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification $ 800        
Corporate [Member]          
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]          
Other Asset Impairment Charges     $ 49   $ 2