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Restructuring and Other Charges - Schedule of Accrued Balances From Restructuring and Other Charges (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Restructuring Reserve [Roll Forward]      
Balance at December 31, 2021 $ 240    
Additional charges 17 $ 6 $ 106
Cash payments/utilization (a) (28)    
Balance at March 31, 2022 229   229
Employee Related Costs      
Restructuring Reserve [Roll Forward]      
Balance at December 31, 2021 91    
Additional charges 18    
Cash payments/utilization (a) (7)    
Balance at March 31, 2022 102   102
Payments for employee related costs from pension fund trust assets 5    
Exit Costs      
Restructuring Reserve [Roll Forward]      
Balance at December 31, 2021 149    
Additional charges (1)    
Cash payments/utilization (a) (21)    
Balance at March 31, 2022 127   127
Non - Cash Charges      
Restructuring Reserve [Roll Forward]      
Balance at December 31, 2021 0    
Additional charges 0    
Cash payments/utilization (a) 0    
Balance at March 31, 2022 $ 0   $ 0