Accrued Expenses and Other Current Liabilities - Details of Accrued Expenses and Other Current Liabilities (Parenthetical) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2020
Accrued Expenses and Other Current Liabilities [Line Items]
Pre-tax restructuring and other related reorganization costs			$ 42
Employee Severance and Related Benefits
Accrued Expenses and Other Current Liabilities [Line Items]
Pre-tax restructuring and other related reorganization costs	$ 33	$ 9	$ 42