Total costs accrued as of the balance sheet date for environmental loss contingencies.

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Contingencies and Commitments - Loss Contingencies (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Litigation Contingencies
Loss Contingency Accrual, Period Increase (Decrease)	$ 0	$ 23
Environmental Remediation Contingency [Domain]
Environmental Contingencies
Liability recorded for projected environmental remediation costs	5		$ 5
Litigation [Member]
Litigation Contingencies
Aggregate reserves for claims deemed both probable and reasonably estimable	46		$ 50
Maximum [Member] \| Environmental Remediation Contingency [Domain]
Litigation Contingencies
Loss Contingency, Estimate of Possible Loss ( Equal to or less than)	16
Maximum [Member] \| Litigation [Member]
Litigation Contingencies
Loss Contingency, Estimate of Possible Loss ( Equal to or less than)	100
Minimum [Member] \| Litigation [Member]
Litigation Contingencies
Loss Contingency, Estimate of Possible Loss ( Equal to or less than)	$ 100