The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Finite Lived Intangible Assets [Line Items]
Estimated amortization charged to income, 2021	$ 307
Estimated amortization charged to income, 2022	304
Estimated amortization charged to income, 2023	293
Estimated amortization charged to income, 2024	269
Estimated amortization charged to income, 2025	259
Amortization expense	$ 371	$ 618	$ 673
Customer Relationships \| Minimum
Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	18 years
Customer Relationships \| Maximum
Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	28 years
Technology/Technical Know-How \| Minimum
Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	10 years
Technology/Technical Know-How \| Maximum
Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	18 years
Tradenames \| Minimum
Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	15 years
Tradenames \| Maximum
Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	30 years