Device Payment Plan Agreement and Wireless Service Receivables - Additional Information (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Jan. 01, 2021	Dec. 31, 2020	Sep. 30, 2020	Jan. 01, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables transferred to ABS Entities	$ 12,100		$ 12,100
Guarantee liability	66
Device payment plan agreement, trade-in liability	(6,034)	$ (5,598)	(5,598)	$ (5,321)	$ (5,307)
Product Trade-in
Accounts, Notes, Loans and Financing Receivable [Line Items]
Device payment plan agreement, trade-in liability	$ (192)		$ (70)
Verizon Business Group And Verizon Consumer Group
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maximum threshold period for new customers	210 days
Minimum threshold period for existing customers	210 days
Device payment plan agreement
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables originating in 2021	$ 11,826
Device payment plan agreement | Consumer | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customer tenure period	45 days
Device payment plan agreement | Consumer | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customer tenure period	45 days
Device payment plan agreement | Business | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customer tenure period	12 months
Device payment plan agreement | Business | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customer tenure period	12 months
Wireless Service Plan Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables originating in 2021	$ 5,000