Discontinued Operations Income Statement (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Total Operating Expenses (1)
Income from discontinued operations, net of tax	$ 40	$ 25
Tempo Business | Discontinued Operations, Disposed of by Sale
Revenue
Total Revenue	527	529
Total Operating Expenses (1)
Operating expense	470	486
Income from discontinued operations before income taxes	57	43
Income taxes	17	18
Income from discontinued operations, net of tax	40	25
Depreciation of fixed assets	8	18
Amortization of intangible assets	$ 11	$ 30