Acquisitions and Divestitures (Schedule of Net Operating Revenues and Loss and Assets and Liabilities Classified as Discontinued Operations) (Details) $ in Millions	3 Months Ended
Mar. 31, 2017 USD ($)
Acquisitions and Divestitures [Abstract]
Net operating revenues	$ 25
Loss from operations of entities sold or held for sale before income taxes	(2)
Loss from discontinued operations, before taxes	(2)
Income tax benefit	(1)
Loss from discontinued operations, net of taxes	$ (1)

Amount before tax of income (loss) from a discontinued operation. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

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- Definition

Amount after tax of income (loss) from a discontinued operation including the portion attributable to the noncontrolling interest. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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