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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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 | $ 1,609 | $ 1,261 | $ 1,151
Charged to Expenses | 2,269 | 2,146 | 1,531
Charged to Other Accounts | 113 | 38 | 69
Deductions | 2,222 | 1,836 | 1,490
Balance at End of Period | 1,769 | 1,609 | 1,261
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 | 592 | 436 |
Balance at End of Period | 617 | 592 | 436
Valuation allowance for deferred tax assets: |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | 1,341 | 1,347 | 1,574
Charged to Expenses | 157 | 68 | 41
Charged to Other Accounts | 0 | 13 | 0
Deductions | 99 | 87 | 268
Balance at End of Period | $ 1,399 | $ 1,341 | $ 1,347

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column B)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column E)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-4 + Details
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