Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

Aggregate commodity forward contracts for natural gas in amounts expressed in nonmonetary units.

+ References

No definition available.

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- Definition

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e681-108580

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80784-113994

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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

The amount of net gains or losses on price risk cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income.

+ References

No definition available.

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- Definition

Amount of unrealized gain (loss) arising from the change in fair value of price risk derivatives designated as cash flow hedging instruments recorded in accumulated other comprehensive income in the period, before taxes, to the extent that the cash flow hedge is determined to be effective.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959

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Derivative Instruments - Derivatives and Hedges (Details) € in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2018 EUR (€) MMBTU	Mar. 31, 2018 USD ($) MMBTU	Dec. 31, 2017 EUR (€) MMBTU	Dec. 31, 2017 USD ($) MMBTU	Mar. 31, 2017 EUR (€) MMBTU	Mar. 31, 2017 USD ($) MMBTU
Commodity forwards contracts \| Cash Flow Hedges
Derivatives and Hedges
Coverage of commodity forward contracts (in MM BTUs) \| MMBTU			8,600,000	8,600,000	8,800,000	8,800,000	11,200,000	11,200,000
Unrecognized (loss) gain included in Accumulated OCI				$ 4		$ 3		$ 1
Amount of gain (loss) Recognized in OCI	$ 1	$ 6
Foreign exchange contracts \| Derivatives not designated as hedging instruments
Derivatives and Hedges
Notional amount				350				$ 340
Cross-currency interest rate swap \| Cash Flow Hedges
Derivatives and Hedges
Unrecognized (loss) gain included in Accumulated OCI				(6)
Amount of gain (loss) Recognized in OCI	(13)
Amount of gain (loss) reclassified from Accumulated OCI into Income	$ (8)
Notional amount			€ 263	$ 310	€ 263	310
Cross-currency interest rate swap \| Cash Flow Hedges \| Maximum
Derivatives and Hedges
Unrecognized (loss) gain included in Accumulated OCI						$ (1)
Interest Rate Swaps \| Derivatives designated as hedging instruments
Derivatives and Hedges
Notional amount \| €							€ 725