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Property, Plant and Equipment Schedule of Property, Plant and Equipment (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross $ 8,343 $ 8,253 $ 7,858
Accumulated Depreciation $ (4,002) $ (3,857) $ (3,565)