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Other Financial Information Other Accrued Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Other Financial Information [Abstract]    
Compensation and employee benefits $ 648 $ 599
Income taxes payable 943 287
Other accrued expenses 2,550 2,188
Total $ 4,141 $ 3,074