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Other Financial Information Other Accrued Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Other Financial Information [Abstract]    
Compensation and employee benefits $ 492 $ 555
Accrued Liabilities and Other Liabilities 175 365
Other accrued expenses 2,118 2,219
Total $ 2,785 $ 3,139