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Revenue - Receivables Not Yet Billed (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Condensed Consolidated Balance Sheet [Line Items]
Receivables, net	$ 13,661	$ 13,813
Noncurrent receivables, net (included in other noncurrent assets, net)	1,853	1,914
Unbilled Revenues | Notes Receivable | Equipment Installment Plan
Condensed Consolidated Balance Sheet [Line Items]
Receivables, net	1,827	1,695
Noncurrent receivables, net (included in other noncurrent assets, net)	1,225	1,223
Total	$ 3,052	$ 2,918

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