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Other Financial Information - Other Current Assets (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
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Prepaid Expenses and Other Current Assets [Abstract] |  |
Prepaid expenses | $ 357 | $ 395
Income tax receivable | 16 | 273
Materials, supplies and inventory | 173 | 209
Contract assets | 13 | 19
Assets held for sale | 86 | 104
Other | 19 | 14
Total other current assets | 871 | 1,223
Acquisition Costs |  |
Prepaid Expenses and Other Current Assets [Abstract] |  |
Contract costs | 101 | 107
Fulfillment Costs |  |
Prepaid Expenses and Other Current Assets [Abstract] |  |
Contract costs | $ 106 | $ 102

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