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Fair Value Measurements (Schedule of Gains and Losses Included in the Level 3 Fair Value Category) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Total gains (losses) included in earnings | $ (2) | $ (10) | $ (20) | $ (25)
Operating Revenue |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Total gains (losses) included in earnings |  |  | (1) |
Electric Fuel and Other Energy-Related Purchases |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Total gains (losses) included in earnings | $ (2) | $ (10) | $ (19) | $ (25)

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- Definition This element represents the net amount of realized and unrealized gains or (losses) included in earnings for assets and liabilities measured at fair value on a recurring basis and included in the Level 3 fair value category. + References No definition available. + Details
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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. + Details
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- Details
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