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Other Financial Data - Schedule of Other Current Assets (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Other Financial Data [Abstract] |  |
Costs to fulfill contracts with customers | $ 339 | $ 335
Taxes receivable | 95 | 88
Prepaid expenses | 111 | 97
Other | 79 | 82
Total | $ 624 | 602
Receivables from divested business |  | $ 4

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