Intangible Assets - Schedule of Intangible Assets by Major Class (Detail) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Finite Lived Intangible Assets [Line Items]
Gross Book Value	$ 12,395	$ 12,465
Accumulated Amortization	3,910	3,738
Net Book Value	8,485	8,727
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Gross Book Value	4,750	4,768
Accumulated Amortization	1,315	1,243
Net Book Value	3,435	3,525
Technology/Technical Know-How
Finite Lived Intangible Assets [Line Items]
Gross Book Value	3,452	3,494
Accumulated Amortization	1,325	1,246
Net Book Value	2,127	2,248
Tradenames
Finite Lived Intangible Assets [Line Items]
Gross Book Value	2,799	2,799
Accumulated Amortization	679	628
Net Book Value	2,120	2,171
Other
Finite Lived Intangible Assets [Line Items]
Gross Book Value	1,394	1,404
Accumulated Amortization	591	621
Net Book Value	$ 803	$ 783