Restructuring and Other Charges - Summary of Status of Total Restructuring Reserves Related to Severance Cost Included in Accrued Liabilities in the Unaudited Consolidated Balance Sheets (Details) - Accrued Liabilities $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($)
Restructuring Cost And Reserve [Line Items]
Beginning of period	$ 19
Charges	9
Usage – cash	(4)
End of period	$ 24