Commitments and Contingencies - Environmental Matters (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Accrued expenses and other current liabilities	$ 8	$ 8
Deferred credits and other liabilities	25	26
Environmental remediation accrual, discounted basis	33	$ 34
Expected payments of environmental remediation costs, 2021	5
Expected payments of environmental remediation costs, 2022	5
Expected payments of environmental remediation costs, 2023	2
Expected payments of environmental remediation costs, 2024	2
Expected payments of environmental remediation costs, 2025	2
Expected payments of environmental remediation costs, 2026 and thereafter	$ 14