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Income Taxes, Schedule of Income Taxes Paid (Refunded), Net (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Taxes Paid, Net |  |  |  |
Income taxes paid (refunded), net | $ 203 | $ (116) |  | $ 1,361
U.S. [Member] |  |  |  |
Income Taxes Paid, Net |  |  |  |
Income taxes paid (refunded), net | 130 | (298) | [1] | 1,016
U.S. [Member] | Internal Revenue Service (IRS) [Member] |  |  |  |
Income Taxes Paid, Net |  |  |  |
Refund received, including interest, associated with income tax audit |  | 348 |  |
International [Member] |  |  |  |
Income Taxes Paid, Net |  |  |  |
Income taxes paid (refunded), net | $ 73 | $ 182 |  | $ 345
[1] | This amount includes a refund of $348 million, including interest, that we received related to the settlement of the combined audit of our U.S. federal income tax returns for 2010 and 2011. See “Tax Returns Under Audit – U.S. Federal” on page 119.

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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4297-108586 + Details
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