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Interim Statement Presentation (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Interim Statement Presentation [Line Items]          
Postemployment Benefits, Period Expense $ 24   $ 2 $ 51 $ 18
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Current 101     101  
Impairment of Long-Lived Assets to be Disposed of   $ 68      
Capitalized Computer Software, Impairments 2 $ 48      
One-time Termination Benefits          
Interim Statement Presentation [Line Items]          
Restructuring Charges 1   $ 6 46 $ 21
Restructuring Reserve, Current $ 19     $ 19