Litigation, Environmental and Other Contingencies Lower Passaic River (Details) - Pending Litigation $ in Millions		3 Months Ended
	Oct. 05, 2016 USD ($)	Mar. 31, 2020 USD ($) mi Parties Defendants claims
Lower Passaic River Study Area
Site Contingency [Line Items]
Miles of river | mi		17
Number of Parties at a Joint Defense Group | Parties		44
Lower Passaic River Study Area | EPA preferred alternative estimate
Site Contingency [Line Items]
Environmental Remediation Expense | $		$ 1,700
Lower Passaic River Study Area | AOC required engineering and design work
Site Contingency [Line Items]
Environmental Remediation Expense | $	$ 165
Loss Contingency, Pending Claims, Number | claims		2
Loss Contingency, Number of Defendants | Defendants		120
Lower Passaic River Study Area | Design
Site Contingency [Line Items]
Estimated Remedy Implementation Period	4 years
Lower Passaic River Study Area | Clean Up Implementation
Site Contingency [Line Items]
Estimated Remedy Implementation Period	6 years
Lower Passaic River Study Area, Lower Portion
Site Contingency [Line Items]
Miles of river | mi		8