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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 ($) counterparty | Dec. 31, 2015 USD ($)
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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

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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 No definition available. + Details
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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 + Details
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