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Commitments and Contingencies (Environmental) (Details) $ in Millions	Sep. 30, 2018 USD ($) Superfund_Sites	Dec. 31, 2017 USD ($)
Accrual for Environmental Loss Contingencies Disclosure [Abstract]
Accrual for Environmental Loss Contingencies	$ 44	$ 48
Superfund Sites [Member]
Accrual for Environmental Loss Contingencies Disclosure [Abstract]
Number Of Superfund Sites | Superfund_Sites	7
Accrual for Environmental Loss Contingencies, Gross	$ 9

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- Definition

Number of federal and state superfund sites for which we have established a liability.

+ References

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 30
-Section 50
-Paragraph 7
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- Definition

Undiscounted amount of the accrual for environmental loss contingencies.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 30
-Section 50
-Paragraph 7
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