Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Discontinued Operations and Disposal Groups [Abstract]
Disposal Group, Including Discontinued Operation, Operating Income (Loss)	$ (1)	$ (46)	$ (2)	$ (44)
Discontinued Operation, Tax Effect of Discontinued Operation	$ (3)	$ 6	$ (3)	$ 2

- Definition

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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