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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) segment	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of primary reportable segments (in segments) | segment				5
Asset impairment charges		$ 1,500	$ 12		$ 12
Increase in sales during the period	5.00%
Reserve for doubtful accounts	$ 37			$ 37		$ 29
Sale of accounts receivable	$ 350
Increase in sale of accounts receivable				$ 150

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