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Restructuring Charges - Summary of Status of Total Restructuring Reserves Related to Severance Cost Included in Accrued Liabilities in the Consolidated Balance Sheets (Details) - Accrued Liabilities - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Restructuring Cost And Reserve [Line Items]      
Beginning of year $ 19 $ 13 $ 22
Charges 40 38 5
Usage (35) (31) (9)
Other   (1) (5)
End of year $ 24 $ 19 $ 13