Intangible Assets - Schedule of Intangible Assets by Major Class (Detail) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Finite Lived Intangible Assets [Line Items]
Gross Book Value	$ 12,628	$ 12,562
Accumulated Amortization	2,885	2,707
Net Book Value	9,743	9,855
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Gross Book Value	4,960	4,938
Accumulated Amortization	927	865
Net Book Value	4,033	4,073
Technology/Technical Know-how
Finite Lived Intangible Assets [Line Items]
Gross Book Value	3,655	3,655
Accumulated Amortization	896	835
Net Book Value	2,759	2,820
Tradenames
Finite Lived Intangible Assets [Line Items]
Gross Book Value	2,847	2,847
Accumulated Amortization	484	458
Net Book Value	2,363	2,389
Other
Finite Lived Intangible Assets [Line Items]
Gross Book Value	1,166	1,122
Accumulated Amortization	578	549
Net Book Value	$ 588	$ 573