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Income Taxes, Liability for Unrecognized Tax Benefits Presented in Balance Sheet (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Amounts Recognized in Balance Sheets for Uncertain Tax Positions |  |
Other long-term liabilities and Deferred tax liabilities | $ 859 | $ 954
Liability for unrecognized tax benefits presented in our balance sheets | 931 | 968
Income Taxes Payable [Member] |  |
Amounts Recognized in Balance Sheets for Uncertain Tax Positions |  |
Income taxes payable | 59 | 0
Other Long-term Liabilities [Member] |  |
Amounts Recognized in Balance Sheets for Uncertain Tax Positions |  |
Other long-term liabilities and Deferred tax liabilities | 859 | 954
Deferred Tax Liabilities[Member] |  |
Amounts Recognized in Balance Sheets for Uncertain Tax Positions |  |
Other long-term liabilities and Deferred tax liabilities | $ 13 | $ 14

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