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Revenue - Schedule of Accounts Receivable (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Disaggregation of Revenue [Line Items]
Receivables, net	$ 13,214	$ 13,661
Noncurrent receivables, net (included in other noncurrent assets, net)	1,810	1,853
Equipment Installment Plan | Notes Receivable | Unbilled Revenues
Disaggregation of Revenue [Line Items]
Receivables, net	1,955	1,827
Noncurrent receivables, net (included in other noncurrent assets, net)	1,216	1,225
Total	$ 3,172	$ 3,052

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