Intangible Assets - Schedule of Intangible Assets by Major Class (Detail) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Finite Lived Intangible Assets [Line Items]
Gross Book Value	$ 5,349	$ 9,676
Accumulated Amortization	1,776	2,587
Net Book Value	3,573	7,089
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Gross Book Value	1,744	3,779
Accumulated Amortization	467	868
Net Book Value	1,277	2,911
Technology/Technical Know-How
Finite Lived Intangible Assets [Line Items]
Gross Book Value	1,290	2,498
Accumulated Amortization	467	779
Net Book Value	823	1,719
Tradenames
Finite Lived Intangible Assets [Line Items]
Gross Book Value	767	1,885
Accumulated Amortization	157	264
Net Book Value	610	1,621
Other
Finite Lived Intangible Assets [Line Items]
Gross Book Value	1,548	1,514
Accumulated Amortization	685	676
Net Book Value	$ 863	$ 838