Derivative Instruments and Hedging Activities (Schedule of Location of Hedging Activities) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments	$ (23)	$ 3	$ 9
Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments	(13)	8	2
Interest Expense | Interest Rate Cap
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments	(7)	4	0
Interest Expense | Interest Rate Swap
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments	(6)	4	2
Cost of product sales | Commodity swaps
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments	$ (10)	$ (5)	$ 7