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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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