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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

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 + Details
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