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Income Taxes, Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Income Tax Narrative (Textual) |  |  |
Increase in valuation allowance |  | $ 23 |
Cumulative undistributed earnings of international subsidiaries |  | 3,200 |
Liability for unrecognized tax benefits due to uncertainties with respect to sustaining refund claims |  | 859 | $ 954
Tax refund receivable recorded in connection with refund claims |  | 589 | 525
Unrecognized tax benefits if recognized that would reduce the effective tax rate |  | 729 | 762
Income tax benefit, tax NOL carryback provided for under CARES Act | [1] | 360 |
U.S. [Member] |  |  |
Income Tax Narrative (Textual) |  |  |
Income tax benefit, tax NOL carryback provided for under CARES Act | [1] | 360 |
U.S. [Member] | Internal Revenue Service (IRS) [Member] |  |  |
Income Tax Narrative (Textual) |  |  |
Refund received, including interest, associated with income tax audit |  |  | 348
Tax Year 2005 through Tax Year 2009 [Member] |  |  |
Income Tax Narrative (Textual) |  |  |
Tax refund receivable recorded in connection with refund claims |  | 525 |
Other Long-term Liabilities [Member] |  |  |
Income Tax Narrative (Textual) |  |  |
Liability for unrecognized tax benefits due to uncertainties with respect to sustaining refund claims |  | 859 | $ 954
Other Long-term Liabilities [Member] | Tax Year 2005 through Tax Year 2009 [Member] |  |  |
Income Tax Narrative (Textual) |  |  |
Liability for unrecognized tax benefits due to uncertainties with respect to sustaining refund claims |  | $ 525 |
[1] | See “CARES Act” on page 119 for a discussion of significant changes in tax law in the U.S that were enacted in 2020.

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