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Summary of Significant Accounting Policies - Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Accounting Policies [Abstract] |  |
Trade accounts payable | $ 437 | $ 392
Client deposits | 702 | 650
Accrued compensation and benefits | 419 | 378
Accrued taxes | 130 | 137
Accrued interest | 220 | 224
Other accrued expenses | 1,278 | 1,299
Total | $ 3,186 | $ 3,080

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