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Summary of Significant Accounting Policies Accounts Payable (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Payables and Accruals [Abstract] |  |  |
Accounts Payable | $ 125 | $ 127 |
Accrued Salaries, Current | 62 | 48 |
Accrued Exchange Fee Rebate, Current | 44 | 34 |
Taxes Payable, Current | 15 | 7 |
Operating Lease, Liability, Current | 8 | 8 |
Other Accrued Liabilities, Current | 13 | 18 |
Accounts payable and accrued liabilities | 267 | 242 |
Unpaid capital expenditures | $ 16 | $ 15 | $ 22

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