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Derivative Instruments (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Fair value of derivatives instruments
Derivative Assets	$ 244	$ 237
Derivative Liabilities	(272)	(281)
Current Assets
Fair value of derivatives instruments
Derivative Assets	161	157
Noncurrent Assets
Fair value of derivatives instruments
Derivative Assets	83	80
Current Liabilities
Fair value of derivatives instruments
Derivative Liabilities	(102)	(106)
Noncurrent Liabilities
Fair value of derivatives instruments
Derivative Liabilities	(170)	(175)
Commodity contracts | Current Assets
Fair value of derivatives instruments
Derivative Assets	144	150
Commodity contracts | Noncurrent Assets
Fair value of derivatives instruments
Derivative Assets	82	78
Commodity contracts | Current Liabilities
Fair value of derivatives instruments
Derivative Liabilities	(94)	(94)
Commodity contracts | Noncurrent Liabilities
Fair value of derivatives instruments
Derivative Liabilities	(46)	(37)
FTRs | Current Assets
Fair value of derivatives instruments
Derivative Assets	17	7
FTRs | Noncurrent Assets
Fair value of derivatives instruments
Derivative Assets	0	1
FTRs | Current Liabilities
Fair value of derivatives instruments
Derivative Liabilities	(8)	(12)
FTRs | Noncurrent Liabilities
Fair value of derivatives instruments
Derivative Liabilities	0	(1)
NUGs | Noncurrent Assets
Fair value of derivatives instruments
Derivative Assets	1	1
NUGs | Noncurrent Liabilities
Fair value of derivatives instruments
Derivative Liabilities	$ (124)	$ (137)

X

- Definition

Fair value, before effects of master netting arrangements, of a 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. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(c)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624163-113959

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4D
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=64830801&loc=SL51823488-111719

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X

- Definition

Fair value, before effects of master netting arrangements, of a financial liability or 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. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4D
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=64830801&loc=SL51823488-111719

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-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 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(c)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624163-113959

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313

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