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Restructuring Activities - Summary of Restructuring Reserves and Related Activities (Details) - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Restructuring Reserve [Roll Forward]      
Restructuring reserve, beginning balance $ 23 $ 31 $ 49
Expense 0 2 0
Change in estimate (2) (1) (1)
Utilization (4) (9) (16)
Foreign currency 0 0 (1)
Restructuring reserve, ending balance $ 17 $ 23 $ 31