Derivatives - Derivative Instruments and their Impact on Financial Condition (Details) - Derivatives Designated as Hedging Instruments - Interest Rate Swaps - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Derivative [Line Items]
Total derivatives designated as hedging instruments	$ 66	$ 34
Other current liabilities
Derivative [Line Items]
Interest rate swaps, liability	14	7
Other non-current liabilities
Derivative [Line Items]
Interest rate swaps, liability	$ 52	$ 27