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Summary of Significant Accounting Policies - Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Accounting Policies [Abstract] |  |
Trade accounts payable | $ 392 | $ 127
Client deposits | 650 | 564
Accrued compensation and benefits | 378 | 199
Accrued taxes | 137 | 18
Accrued interest | 224 | 35
Other accrued expenses | 1,299 | 203
Total | $ 3,080 | $ 1,146

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