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Goodwill and Intangible Assets, Net - Summary Of Operating Segments Presenting Impairment Charges Or Relative Impairment Risk (Detail) - Operating segments [member] - United States [member] $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Disclosure Of Operating Segments Presenting Impairment Charges Or Relative Impairment Risk [Line Items]
Impairment losses recognized	$ 1,020
Discount rate +1%	$ 188

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