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Regulatory Matters, Commitments, Contingencies And Environmental Liabilities Regulatory Matters, Commitments, Contingencies And Environemental Liabilities (Environmental Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Environmental Remediation Obligations [Abstract] |  |
Current |  | $ 42
Non-current |  | 295
Total environmental liabilities | $ 320 | $ 337

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