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, 2018	Dec. 31, 2017	Dec. 31, 2016
Finite Lived Intangible Assets [Line Items]
Estimated amortization charged to income, 2019	$ 677
Estimated amortization charged to income, 2020	668
Estimated amortization charged to income, 2021	632
Estimated amortization charged to income, 2022	622
Estimated amortization charged to income, 2023	612
Amortization expense	$ 673	$ 663	$ 567
Customer Relationships \| Minimum
Finite Lived Intangible Assets [Line Items]
Amortization period	18 years
Customer Relationships \| Maximum
Finite Lived Intangible Assets [Line Items]
Amortization period	28 years
Technology/Technical Know-How \| Minimum
Finite Lived Intangible Assets [Line Items]
Amortization period	10 years
Technology/Technical Know-How \| Maximum
Finite Lived Intangible Assets [Line Items]
Amortization period	18 years
Tradenames \| Minimum
Finite Lived Intangible Assets [Line Items]
Amortization period	15 years
Tradenames \| Maximum
Finite Lived Intangible Assets [Line Items]
Amortization period	30 years