Commitments and Contingent Liabilities Environmental (Details) $ in Millions	Jun. 30, 2018 USD ($)
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies	$ 426
Accrual for Environmental Loss Contingencies, Potential Exposure in Excess of Accrual	860
Superfund Sites [Member]
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies	60
Chemours [Member]
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies	236
Accrual for Environmental Loss Contingencies, Potential Exposure in Excess of Accrual	420
Chemours [Member] | Indemnification Agreement [Member]
Loss Contingencies [Line Items]
Indemnification Assets	236
Chemours [Member] | Indemnification Agreement [Member] | Superfund Sites [Member]
Loss Contingencies [Line Items]
Indemnification Assets	$ 41