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

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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)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
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-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.

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- Definition

Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of foreign currency derivatives not designated as hedging instruments.

+ 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 (e)
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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.

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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.

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Derivative Instruments - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
Derivative Instruments - Narrative (Details) $ in Millions	Sep. 30, 2016 USD ($) MMBTU	Sep. 30, 2015 USD ($) MMBTU	Sep. 30, 2016 USD ($) MMBTU	Sep. 30, 2015 USD ($) MMBTU	Dec. 31, 2015 USD ($)
Commodity forward contracts \| Cash Flow Hedges
Derivatives and Hedges
Coverage of commodity forward contracts (in MM BTUs) \| MMBTU	12,400,000	6,300,000	12,400,000	6,300,000
Unrecognized gain (loss) included in Accumulated OCI	$ 2	$ 2	$ 2	$ 2	$ (4)
Commodity forward contracts gain (loss) recognized in OCI	(1)	2	2	2
Commodity forward contracts gain (loss) reclassified from accumulated OCI into income		4		6
Foreign exchange derivative contracts \| Derivatives not designated as hedging instruments \| Other expense
Derivatives and Hedges
Foreign exchange contracts gain (loss) recognized in income	4	(4)
Foreign exchange derivative contracts. \| Derivatives not designated as hedging instruments
Derivatives and Hedges
Forward exchange contracts in various currencies	$ 580	$ 600	580	600
Foreign exchange derivative contracts. \| Derivatives not designated as hedging instruments \| Other expense
Derivatives and Hedges
Foreign exchange contracts gain (loss) recognized in income			$ 6	$ 2