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Commitments and Contingent Liabilities Other PFOA Matters / Fayetteville (Details) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2021 USD ($) lawsuits | Dec. 31, 2020 USD ($) | Mar. 31, 2020 USD ($)
Loss Contingencies [Line Items] |  |  |
Guarantee Obligations | $ | $ 108 | $ 94 | $ 90
Factoring Agreement [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Guarantee Obligations | $ | $ 23 | $ 17 | $ 17
Firefighting Foam [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Loss Contingency, Pending Claims, Number | 985 |  |
Personal injury cases [Member] | Firefighting Foam [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Loss Contingency, Pending Claims, Number | 910 |  |
NEW YORK | PFOA Matters: Drinking Water Actions [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Loss Contingency, Pending Claims, Number | 50 |  |
NEW JERSEY | PFOA Matters: Drinking Water Actions [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Loss Contingency, Pending Claims, Number | 2 |  |
NEW JERSEY | Natural Resources Damages [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Loss Contingency, Pending Claims, Number | 4 |  |
OHIO | PFOA Matters: Drinking Water Actions [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Loss Contingency, Pending Claims, Number | 3 |  |
NORTH CAROLINA | PFOA Matters: Drinking Water Actions [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Loss Contingency, Number of Property Owners | 100 |  |
Loss Contingency, Number of Additional Plaintiffs | 100 |  |
Alabama Water Utility [Member] | Natural Resources Damages [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Loss Contingency, Pending Claims, Number | 1 |  |

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