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Income Taxes, Reconciliation of Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Unrecognized Tax Benefits |  |  |  |
Unrecognized tax benefits | $ 847 | $ 897 | $ 970 | $ 941
Tax refund claims not yet filed but that we intend to file | (26) | (29) |  |
Interest and penalties | 110 | 100 |  |
Liability for unrecognized tax benefits presented in our balance sheets | $ 931 | $ 968 |  |

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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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- Definition The total amount recognized for uncertain tax positions as of the balance sheet date, including current and noncurrent portions. + References No definition available. + Details
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