Interest Expense And Interest Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest Income (Expense), Net [Abstract]
Interest expense	$ 168	$ 141	$ 195
Amortization of deferred financing fees	7	6	15
Interest income	(2)	(3)	(1)
Interest expense, net	$ 173	$ 144	$ 209