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Other current assets and accrued liabilities Schedule of Other Assets (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Payables and Accruals [Abstract] |  |
Prepaid expenses | $ 939 | $ 907
Corporate partner receivables | 485 | 444
Interest receivables | 110 | 177
Other | 354 | 266
Total other current assets | $ 1,888 | $ 1,794

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