Other (Income) Expense - Narrative (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Other Income And Expenses [Abstract]
Gain (loss) related to settlement				$ 69
Interest income, tax settlement	$ 48		$ 0	48	$ 0
Net foreign currency exchange (gains) losses include expense related to out of period adjustment		$ 7
Write off of previously capitalized Bridge Facility fees	$ 10			$ 10