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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Amount of loss contingency liability.

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Amount of increase (decrease) in loss contingency liability.

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Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
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-Section 50
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Contingencies and Commitments - Loss Contingencies (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Litigation Contingencies
Loss Contingency Accrual, Period Increase (Decrease)	$ 23	$ 21
Environmental Remediation Contingency [Domain]
Environmental Contingencies
Liability recorded for projected environmental remediation costs	9		$ 12
Litigation [Member]
Litigation Contingencies
Aggregate reserves for claims deemed both probable and reasonably estimable	173		$ 179
Maximum [Member] \| Environmental Remediation Contingency [Domain]
Litigation Contingencies
Loss Contingency, Estimate of Possible Loss ( Equal to or less than)	22
Maximum [Member] \| Litigation [Member]
Litigation Contingencies
Loss Contingency, Estimate of Possible Loss ( Equal to or less than)	1,800
Minimum [Member] \| Litigation [Member]
Litigation Contingencies
Loss Contingency, Estimate of Possible Loss ( Equal to or less than)	$ 1,500