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Other Financial Information (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Prepaid Expenses and Other Current Assets [Abstract] |  |
Prepaid expenses | $ 352 | $ 307
Income tax receivable | 5 | 82
Materials, supplies and inventory | 137 | 120
Contract assets | 51 | 52
Other | 53 | 108
Total other current assets | 884 | 918
Contract Acquisition Costs |  |
Prepaid Expenses and Other Current Assets [Abstract] |  |
Contract costs | 175 | 167
Contract Fulfillment Costs |  |
Prepaid Expenses and Other Current Assets [Abstract] |  |
Contract costs | $ 111 | $ 82

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