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Fair Value Measurements (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Fair Value Measurements:    
Carrying Value $ 88,372 $ 82,752
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts Receivable, Net 2,645 2,539
Other noncurrent assets 3,523 3,449
Senior notes and debentures    
Fair Value Measurements:    
Carrying Value 76,950 72,671
Credit facilities    
Fair Value Measurements:    
Carrying Value 11,422 10,081
Level 1 | Senior notes and debentures    
Fair Value Measurements:    
Fair Value 85,880 84,163
Level 2 | Credit facilities    
Fair Value Measurements:    
Fair Value 11,428 10,063
Equipment installment plan receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts Receivable, Net 377 338
Other noncurrent assets 170 134
Cross Currency Derivatives | Level 2    
Fair Value Measurements:    
Derivative Liability $ 317 $ 184