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Derivative Instruments (Details) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2017 USD ($) MMBTU	Dec. 31, 2016 USD ($) MMBTU
Natural Gas Hedge [Member] | Prepaid and Other Assets [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fair value of derivative instruments in hedges	$ 1	$ 3
Natural Gas Hedge [Member] | Accumulated Other Comprehensive Loss [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Offset amount recognized against derivative asset	$ 2
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Natural Gas Commodity Price Contracts [Member] | Forward Contracts [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative contracts, maturity date	Dec. 31, 2017
Aggregate notional volume of outstanding natural gas commodity forward contracts | MMBTU	3.8	4.8

X

- Definition

Fair value, after effects of master netting arrangements, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset offset against an obligation to return collateral. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=d3e41678-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226016-175313

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Aggregate net fair value of all derivative instruments designated as hedging instruments. Includes instruments designated as cash flow hedges, fair value hedges, and hedges of net investments in foreign operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13495-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611

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- Definition

Date the derivative contract matures, in CCYY-MM-DD format.

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- Definition

Nominal energy measure used to calculate payments on a derivative instrument.

+ References

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