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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
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Mar. 31, 2018 | Mar. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items] |  |
Total gains (losses) included in earnings | $ (18) | $ (15)
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 | $ (17) | $ (15)

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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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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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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