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Fair Value Measurements (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value Measurements: |  |
Carrying Value | $ 88,372 | $ 82,752
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts Receivable, Net | 2,645 | 2,539
Other noncurrent assets | 3,523 | 3,449
Senior notes and debentures |  |
Fair Value Measurements: |  |
Carrying Value | 76,950 | 72,671
Credit facilities |  |
Fair Value Measurements: |  |
Carrying Value | 11,422 | 10,081
Level 1 | Senior notes and debentures |  |
Fair Value Measurements: |  |
Fair Value | 85,880 | 84,163
Level 2 | Credit facilities |  |
Fair Value Measurements: |  |
Fair Value | 11,428 | 10,063
Equipment installment plan receivable |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts Receivable, Net | 377 | 338
Other noncurrent assets | 170 | 134
Cross Currency Derivatives | Level 2 |  |
Fair Value Measurements: |  |
Derivative Liability | $ 317 | $ 184

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