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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.