Accounts Receivable - Allowance for Credit Losses (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Changes in allowance for credit losses [Roll Forward]
Beginning Balance	$ 61	$ 39	$ 41
Additions	27	66	51
Deductions	(50)	(44)	(53)
Ending Balance	38	61	39
Financing Receivable, Allowance for Credit Loss [Line Items]
Cumulative effect of new accounting principle in period of adoption, net of tax	11,635	10,098	10,117
RETAINED EARNINGS (ACCUMULATED DEFICIT)
Financing Receivable, Allowance for Credit Loss [Line Items]
Cumulative effect of new accounting principle in period of adoption, net of tax	$ 1,585	$ 48	67	$ (182)
Cumulative Effect, Period of Adoption, Adjustment | RETAINED EARNINGS (ACCUMULATED DEFICIT)
Financing Receivable, Allowance for Credit Loss [Line Items]
Cumulative effect of new accounting principle in period of adoption, net of tax			$ 3	$ 22