Intangible Assets - Schedule of Intangible Assets by Major Class (Detail) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Finite Lived Intangible Assets [Line Items]
Gross Book Value	$ 12,523	$ 12,567
Accumulated Amortization	3,431	3,213
Net Book Value	9,092	9,354
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Gross Book Value	4,814	4,832
Accumulated Amortization	1,129	1,020
Net Book Value	3,685	3,812
Technology/Technical Know-how
Finite Lived Intangible Assets [Line Items]
Gross Book Value	3,578	3,634
Accumulated Amortization	1,137	1,078
Net Book Value	2,441	2,556
Tradenames
Finite Lived Intangible Assets [Line Items]
Gross Book Value	2,806	2,806
Accumulated Amortization	584	533
Net Book Value	2,222	2,273
Other
Finite Lived Intangible Assets [Line Items]
Gross Book Value	1,325	1,295
Accumulated Amortization	581	582
Net Book Value	$ 744	$ 713