Commitments and Contingencies - Environmental Matters (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Accrued expenses and other current liabilities	$ 9	$ 8
Deferred credits and other liabilities	26	28
Environmental remediation accrual, discounted basis	$ 35	$ 36
Weighted average discount rate	0.45%	1.30%
Expected payments of environmental remediation costs, 2020	$ 5
Expected payments of environmental remediation costs, 2021	4
Expected payments of environmental remediation costs, 2022	2
Expected payments of environmental remediation costs, 2023	2
Expected payments of environmental remediation costs, 2024	2
Expected payments of environmental remediation costs, 2025 and thereafter	$ 15