Intangible Assets - Schedule of Intangible Assets by Major Class (Detail) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Finite Lived Intangible Assets [Line Items]
Gross Book Value	$ 12,404	$ 6,491
Accumulated Amortization	2,567	1,922
Net Book Value	9,837	4,569
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Gross Book Value	4,879	2,489
Accumulated Amortization	806	645
Net Book Value	4,073	1,844
Technology/Technical know-how
Finite Lived Intangible Assets [Line Items]
Gross Book Value	3,614	1,864
Accumulated Amortization	778	653
Net Book Value	2,836	1,211
Tradenames
Finite Lived Intangible Assets [Line Items]
Gross Book Value	2,847	1,625
Accumulated Amortization	432	367
Net Book Value	2,415	1,258
Other
Finite Lived Intangible Assets [Line Items]
Gross Book Value	1,064	513
Accumulated Amortization	551	257
Net Book Value	$ 513	$ 256