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Contingencies and Commitments - Loss Contingencies (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
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Environmental Contingencies |  |
Liability recorded for projected environmental remediation costs | $ 4 | $ 4
Litigation [Member] |  |
Litigation Contingencies |  |
Aggregate reserves for claims deemed both probable and reasonably estimable | 14 | $ 55
Maximum [Member] |  |
Litigation Contingencies |  |
Loss Contingency, Estimate of Possible Loss ( Equal to or less than) | 11 |
Maximum [Member] | Litigation [Member] |  |
Litigation Contingencies |  |
Loss Contingency, Estimate of Possible Loss ( Equal to or less than) | 481 |
Minimum [Member] | Litigation [Member] |  |
Litigation Contingencies |  |
Loss Contingency, Estimate of Possible Loss ( Equal to or less than) | $ 241 |

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