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Restructuring Charges (Narrative) (Details)
$ in Millions
Sep. 30, 2019
USD ($)
restructuring_program
Restructuring Cost and Reserve  
Restructuring costs incurred to date $ 331
Closed Restructuring Programs  
Restructuring Cost and Reserve  
Number of restructuring programs | restructuring_program 4
Restructuring and related activities, number of completed restructuring programs, liability $ 12