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Financial Instruments - Credit Losses (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Receivables [Abstract]    
Allowance for credit loss $ 717 $ 671
Trade receivable 14,600  
Non-trade receivable 3,300  
Investments and Advances    
Related Party Transaction [Line Items]    
Allowance for credit loss $ 560 $ 560