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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)

X

- 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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X

- 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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X

- Details

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