Intangible Assets - Schedule of Intangible Assets by Major Class (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Finite Lived Intangible Assets [Line Items]
Gross Book Value	$ 12,584	$ 12,567
Accumulated Amortization	3,367	3,213
Net Book Value	9,217	9,354
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Gross Book Value	4,833	4,832
Accumulated Amortization	1,079	1,020
Net Book Value	3,754	3,812
Technology/Technical Know-how
Finite Lived Intangible Assets [Line Items]
Gross Book Value	3,619	3,634
Accumulated Amortization	1,127	1,078
Net Book Value	2,492	2,556
Tradenames
Finite Lived Intangible Assets [Line Items]
Gross Book Value	2,806	2,806
Accumulated Amortization	558	533
Net Book Value	2,248	2,273
Other
Finite Lived Intangible Assets [Line Items]
Gross Book Value	1,326	1,295
Accumulated Amortization	603	582
Net Book Value	$ 723	$ 713