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Fair Value Measurements (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Fair Value Measurements:    
Carrying Value $ 84,887 $ 82,752
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts Receivable, Net 2,395 2,539
Other noncurrent assets 3,531 3,449
Senior notes and debentures    
Fair Value Measurements:    
Carrying Value 74,872 72,671
Credit facilities    
Fair Value Measurements:    
Carrying Value 10,015 10,081
Level 1 | Senior notes and debentures    
Fair Value Measurements:    
Fair Value 82,191 84,163
Level 2 | Credit facilities    
Fair Value Measurements:    
Fair Value 10,032 10,063
Equipment installment plan receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts Receivable, Net 344 338
Other noncurrent assets 168 134
Cross Currency Derivatives | Level 2    
Fair Value Measurements:    
Derivative Liability $ 121 $ 184