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Contingencies and Commitments - Loss Contingencies (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
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Environmental Remediation Contingency [Domain] |  |
Environmental Contingencies |  |
Liability recorded for projected environmental remediation costs | $ 4 |
Litigation [Member] |  |
Litigation Contingencies |  |
Aggregate reserves for claims deemed both probable and reasonably estimable | 43 | $ 55
Maximum [Member] | Environmental Remediation Contingency [Domain] |  |
Litigation Contingencies |  |
Loss Contingency, Estimate of Possible Loss ( Equal to or less than) | 13 |
Maximum [Member] | Litigation [Member] |  |
Litigation Contingencies |  |
Loss Contingency, Estimate of Possible Loss ( Equal to or less than) | 689 |
Minimum [Member] | Litigation [Member] |  |
Litigation Contingencies |  |
Loss Contingency, Estimate of Possible Loss ( Equal to or less than) | $ 260 |

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