Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Allowance for credit losses deducted from accounts receivable:
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 1,151	$ 1,507
Charged to Expenses	1,531	743	$ 1,390
Charged to Other Accounts	69	139	165
Deductions	1,490	1,238	1,173
Balance at End of Period	1,261	1,151	1,507
Allowance for credit losses deducted from accounts receivable: | Device payment plan agreement
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	255	254
Balance at End of Period	436	255	254
Allowance for credit losses deducted from accounts receivable: | Adjusted opening balance
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period			1,125
Valuation allowance for deferred tax assets:
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	1,574	2,183	2,260
Charged to Expenses	41	339	202
Charged to Other Accounts	0	0	84
Deductions	268	948	363
Balance at End of Period	$ 1,347	$ 1,574	$ 2,183