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Income Taxes (Income Tax Payables and Income Tax Receivables) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Income Tax Disclosure [Abstract] |  |
Income taxes receivable—current | $ 138 | $ 131
Income Taxes Receivable, Noncurrent | 9 | 10
Total income taxes receivable | 147 | 141
Income taxes payable—current | 284 | 172
Income taxes payable—noncurrent | 0 | 0
Total income taxes payable | $ 284 | $ 172

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