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Income Taxes, Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Tax Narrative (Textual) |  |  |  |
Increase in valuation allowance |  | $ 39 |  |
Liability for unrecognized tax benefits due to uncertainties with respect to sustaining refund claims |  | 863 | $ 859 |
Tax refund receivable recorded in connection with refund claims |  | 586 | 589 |
Unrecognized tax benefits if recognized that would reduce the effective tax rate |  | 708 | 729 |
Income tax benefit, tax NOL carryback provided for under CARES Act | [1] | 56 | 360 |
Cumulative undistributed earnings of foreign subsidiaries |  | 4,500 |  |
U.S. [Member] |  |  |  |
Income Tax Narrative (Textual) |  |  |  |
Income tax benefit, tax NOL carryback provided for under CARES Act | [1] | 56 | 360 |
U.S. [Member] | Internal Revenue Service (IRS) [Member] |  |  |  |
Income Tax Narrative (Textual) |  |  |  |
Refund received, including interest, associated with income tax audit |  | 962 |  | $ 348
Income tax benefit, tax NOL carryback provided for under CARES Act |  | 56 | 360 |
Tax Year 2005 through Tax Year 2011 [Member] | U.S. [Member] | Internal Revenue Service (IRS) [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 |  | 863 | 859 |
Other Long-term Liabilities [Member] | Tax Year 2005 through Tax Year 2011 [Member] | U.S. [Member] | Internal Revenue Service (IRS) [Member] |  |  |  |
Income Tax Narrative (Textual) |  |  |  |
Liability for unrecognized tax benefits due to uncertainties with respect to sustaining refund claims |  | $ 525 | $ 525 |
[1] | See “CARES Act” on page 122 for a discussion of significant changes in tax law in the U.S. that were enacted in 2020.

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