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Intangible Assets - Schedule of Intangible Assets by Major Class (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Finite Lived Intangible Assets [Line Items]    
Gross Book Value $ 12,465 $ 12,567
Accumulated Amortization 3,738 3,213
Net Book Value 8,727 9,354
Customer Relationships    
Finite Lived Intangible Assets [Line Items]    
Gross Book Value 4,768 4,832
Accumulated Amortization 1,243 1,020
Net Book Value 3,525 3,812
Technology/Technical Know-How    
Finite Lived Intangible Assets [Line Items]    
Gross Book Value 3,494 3,634
Accumulated Amortization 1,246 1,078
Net Book Value 2,248 2,556
Tradenames    
Finite Lived Intangible Assets [Line Items]    
Gross Book Value 2,799 2,806
Accumulated Amortization 628 533
Net Book Value 2,171 2,273
Other    
Finite Lived Intangible Assets [Line Items]    
Gross Book Value 1,404 1,295
Accumulated Amortization 621 582
Net Book Value $ 783 $ 713