Intangible Assets - Schedule of Intangible Assets by Major Class (Detail) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Finite Lived Intangible Assets [Line Items]
Gross Book Value	$ 12,761	$ 12,562
Accumulated Amortization	3,221	2,707
Net Book Value	9,540	9,855
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Gross Book Value	4,969	4,938
Accumulated Amortization	1,053	865
Net Book Value	3,916	4,073
Technology/Technical Know-how
Finite Lived Intangible Assets [Line Items]
Gross Book Value	3,661	3,655
Accumulated Amortization	1,019	835
Net Book Value	2,642	2,820
Tradenames
Finite Lived Intangible Assets [Line Items]
Gross Book Value	2,847	2,847
Accumulated Amortization	537	458
Net Book Value	2,310	2,389
Other
Finite Lived Intangible Assets [Line Items]
Gross Book Value	1,284	1,122
Accumulated Amortization	612	549
Net Book Value	$ 672	$ 573