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Commitments and Contingent Liabilities - Environmental - Narrative (Details) - USD ($) $ in Millions |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Sep. 09, 2019 | Sep. 27, 2018 | Jun. 29, 2018 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Environmental Remediation [Line Items] |  |  |  |  |  |  |  |  |
Environmental remediation activities amount |  |  |  |  | $ 3 |  | $ 200 | $ 101 | $ 48
Sale of asset to third party |  |  |  |  | $ 39 |  | 9 | 46 | 39
Accrual for environmental remediation activities |  |  |  |  |  | $ 406 | 406 | 291 |
Off-site Replacement Drinking Water Supplies [Member] |  |  |  |  |  |  |  |  |
Environmental Remediation [Line Items] |  |  |  |  |  |  |  |  |
Estimated disbursements amount |  |  |  |  |  |  | $ 46 |  |
Accrued for operation, maintenance, and monitoring period |  |  |  |  |  |  | 20 years |  |
Disbursements period |  |  |  |  |  |  | 20 years |  |
On-site Surface Water and Groundwater Remediation [Member] |  |  |  |  |  |  |  |  |
Environmental Remediation [Line Items] |  |  |  |  |  |  |  |  |
Estimated cost of remediation |  |  |  |  |  | 132 |  |  |
Estimated cost of remediation related to construction |  |  |  |  |  | $ 42 |  |  |
Construction costs projected paid period |  |  |  |  |  | 2025 |  |  |
Estimated cost of remediation related to OM&M |  |  |  |  |  | $ 88 |  |  |
OM&M projected paid period |  |  |  |  |  | 20 years |  |  |
East Chicago, Indiana [Member] |  |  |  |  |  |  |  |  |
Environmental Remediation [Line Items] |  |  |  |  |  |  |  |  |
Sale of asset to third party |  |  | $ 1 |  |  |  |  |  |
Environmental remediation cost assumed by seller |  |  | 21 |  |  |  |  |  |
Accrual for environmental remediation activities |  |  | 21 |  |  |  |  |  |
Gain on sale of asset |  |  | 3 |  |  |  |  |  |
Purchase price of asset sold |  |  | 1 |  |  |  |  |  |
Environmental remediation liability |  |  | $ 2 |  |  |  |  |  |
Potomac River Site [Member] |  |  |  |  |  |  |  |  |
Environmental Remediation [Line Items] |  |  |  |  |  |  |  |  |
Sale of asset to third party |  | $ 4 |  |  |  |  |  |  |
Gain on sale of asset |  | 3 |  |  |  |  |  |  |
Environmental remediation liability |  | $ 4 |  |  |  |  |  |  |
Oakley Site [Member] |  |  |  |  |  |  |  |  |
Environmental Remediation [Line Items] |  |  |  |  |  |  |  |  |
Sale of asset to third party | $ 7 |  |  |  |  |  |  |  |
Gain on sale of asset | 2 |  |  |  |  |  |  |  |
Environmental remediation liability | 10 |  |  |  |  |  |  |  |
Sale of asset to third party received amount | 4 |  |  |  |  |  |  |  |
Proceeds contingent upon the completion of certain future environmental remediation activities | $ 3 |  |  |  |  |  |  |  |
Fayetteville Works, Fayetteville, North Carolina [Member] |  |  |  |  |  |  |  |  |
Environmental Remediation [Line Items] |  |  |  |  |  |  |  |  |
Accrual for environmental remediation activities |  |  |  |  |  | $ 201 | $ 201 | $ 75 |
PFOA [Member] |  |  |  |  |  |  |  |  |
Environmental Remediation [Line Items] |  |  |  |  |  |  |  |  |
Civil penalty and investigative costs |  |  |  | $ 13 |  |  |  |  |
Percentage of efficiency to control PFAS |  |  |  |  |  |  | 99.99% |  |
Air quality test maximum period to conduct |  |  |  |  |  |  | 90 days |  |
PFOA [Member] | Fayetteville Works, Fayetteville, North Carolina [Member] |  |  |  |  |  |  |  |  |
Environmental Remediation [Line Items] |  |  |  |  |  |  |  |  |
Percentage of efficiency to control PFAS |  |  |  |  |  |  | 99.99% |  |
Reduction of PFAS maximum period |  |  |  |  |  |  | 2 years |  |
Percentage of baseline |  |  |  |  |  |  | 75.00% |  |
Minimum [Member] |  |  |  |  |  |  |  |  |
Environmental Remediation [Line Items] |  |  |  |  |  |  |  |  |
Average time frame of disbursements of environmental site remediation |  |  |  |  |  |  | 15 years |  |
Maximum [Member] |  |  |  |  |  |  |  |  |
Environmental Remediation [Line Items] |  |  |  |  |  |  |  |  |
Average time frame of disbursements of environmental site remediation |  |  |  |  |  |  | 20 years |  |
Loss contingency, potential additional loss |  |  |  |  |  |  |  |  | $ 530

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