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Other Financial Information (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Prepaid Expenses and Other Current Assets [Abstract] |  |
Prepaid expenses | $ 403 | $ 290
Income tax receivable | 6 | 7
Materials, supplies and inventory | 100 | 105
Contract assets | 64 | 66
Other | 66 | 53
Total other current assets | 924 | 808
Acquisition Costs |  |
Prepaid Expenses and Other Current Assets [Abstract] |  |
Contract costs | 170 | 173
Fulfillment Costs |  |
Prepaid Expenses and Other Current Assets [Abstract] |  |
Contract costs | $ 115 | $ 114

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