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Asset Retirement Obligations and Accrued Environmental Costs - Textuals (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Environmental Liabilities [Line Items] |  |
Accrued environmental costs | $ 171 | $ 178
Accrued Enviornmental Costs Discounted | $ 97 |
Maximum number of years accrued environmental liabilities will be paid over | 30 years |
Expected expenditures for acquired environmental obligations, weighted-average discount factor rate | 5.00% |
Accrued environmental costs, undiscounted due 2020 | $ 10 |
Accrued environmental costs, undiscounted due 2021 | 7 |
Accrued environmental costs, undiscounted due 2022 | 10 |
Accrued environmental costs, undiscounted due 2023 | 3 |
Accrued environmental costs, undiscounted due 2024 | 2 |
Accrued environmental costs, undiscounted due after 2025 | 108 |
Cleanup Remediation Activities [Member] |  |
Environmental Liabilities [Line Items] |  |
Accrued environmental costs | 112 | 100
Corporate and Other Environmental Liabilities [Member] |  |
Environmental Liabilities [Line Items] |  |
Accrued environmental costs | 47 | 67
Federal Comprehensive Environmental Response Compensation and Liability Act or Similar State Laws [Member] |  |
Environmental Liabilities [Line Items] |  |
Accrued environmental costs | $ 12 | $ 11

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