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Revenue - Schedule of Accounts Receivable (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Disaggregation of Revenue [Line Items] |  |
Receivables, net | $ 13,144 | $ 13,813
Noncurrent receivables, net (included in other noncurrent assets, net) | 1,899 | 1,914
Equipment Installment Plan | Notes Receivable | Unbilled Revenues |  |
Disaggregation of Revenue [Line Items] |  |
Receivables, net | 1,708 | 1,695
Noncurrent receivables, net (included in other noncurrent assets, net) | 1,201 | 1,223
Total | $ 2,909 | $ 2,918

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