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Property, Plant, and Capitalized Software (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]      
Depreciation $ 997 $ 995 $ 924
Capitalized Computer Software, Amortization $ 814 $ 721 $ 606