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Property, Plant And Equipment (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Property, Plant and Equipment [Line Items] |  |  |  |
Proceeds from sale of property | $ 63 | $ 18 | $ 3,148 |
Proceeds from sale and lease-back transactions |  |  | 30 | $ 70
Property, plant and equipment | 16,324 | 19,318 | 16,324 |
Capital expenditures |  | 2,783 | 3,211 | $ 2,738
Vendor financing payments |  | 463 |  |
Accounts payable associated with capital |  | 585 |  |
Accounts payable and accrued liabilities associated with capital |  | 8 |  |
Other liabilities associated with capital expenditures |  | 24 |  |
Vendor financing payables associated with capital expenditures |  | 16 |  |
Capitalized interest |  | 49 |  |
Land and Building [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Aggregate carrying value |  | 11 |  |
Gain (Loss) on sale of property |  | 7 |  |
Capital Leases [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, net | 179 | 246 | 179 |
Towers [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Proceeds from sale of property | 47 |  |  |
Gain (Loss) on sale of property | 28 |  |  |
Property, plant and equipment | 19 |  | 19 |
Materials And Supplies [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment | $ 594 | $ 431 | $ 594 |

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