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Intangible Assets - Schedule of Intangible Assets by Major Class (Detail) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Finite Lived Intangible Assets [Line Items]    
Gross Book Value $ 9,728 $ 12,465
Accumulated Amortization 2,446 3,738
Net Book Value 7,282 8,727
Customer Relationships    
Finite Lived Intangible Assets [Line Items]    
Gross Book Value 3,859 4,768
Accumulated Amortization 853 1,243
Net Book Value 3,006 3,525
Technology/Technical Know-How    
Finite Lived Intangible Assets [Line Items]    
Gross Book Value 2,526 3,494
Accumulated Amortization 735 1,246
Net Book Value 1,791 2,248
Tradenames    
Finite Lived Intangible Assets [Line Items]    
Gross Book Value 1,911 2,799
Accumulated Amortization 248 628
Net Book Value 1,663 2,171
Other    
Finite Lived Intangible Assets [Line Items]    
Gross Book Value 1,432 1,404
Accumulated Amortization 610 621
Net Book Value $ 822 $ 783