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.