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Fair Value Measurements and Credit Concentration (Financial Instruments Not Recorded at Fair Value and Credit Concentration) (Details) $ in Millions	Mar. 31, 2016 USD ($) counterparty	Dec. 31, 2015 USD ($)
Credit Concentration Associated with Financial Instruments (Numeric) [Abstract]
Gross credit exposure from energy trading partners	$ 579
Net credit exposure to energy trading partners	400
Dollar exposure to top ten energy trading counterparties	$ 161
Percentage exposure to top ten energy trading counterparties	40.00%
Number of counterparties in top ten that have investment grade credit rating | counterparty	8
Percentage of top ten's exposure that consists of counterparties with investment grade credit rating	86.00%
Carrying Amount
Fair Value of Financial Instruments Not Recorded at Fair Value - Other
Long-term debt	$ 4,268	$ 4,203
Fair Value
Fair Value of Financial Instruments Not Recorded at Fair Value - Other
Long-term debt	$ 3,808	$ 3,343

X

- Definition

Reflects the maximum amount of loss due to credit risk with energy trading partners, excluding netting arrangements, reserves and collateral.

+ References

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- Definition

Reflects the dollar exposure of credit risk to the top ten energy trading counterparties.

+ References

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- Definition

Reflects the amount of loss due to credit risk with energy trading partners after considering netting arrangements and collateral.

+ References

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- Definition

Reflects the number of top ten energy trading counterparties, which the company has credit risk exposure, that have an investment grade credit rating.

+ References

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- Definition

Reflects the percentage exposure of credit risk to the top ten energy trading counterparties.

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- Definition

The energy trading counterparties in top ten that have an investment grade credit rating, reflected as a percentage of the top ten's credit risk exposure.

+ References

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: 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=49121117&loc=d3e13433-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13476-108611

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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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