Discontinued Operations (Details)		3 Months Ended
	May 01, 2017 USD ($) agreement	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)
Dispositions
Cash and cash equivalents from discontinued operations			$ 18,000,000	$ 5,000,000
Tempo Business
Dispositions
Number of commercial agreements | agreement	2
Tempo Business | Discontinued Operations, Disposed of by Sale
Dispositions
Purchase price	$ 4,300,000,000
Gain on sale of discontinued operations, net of tax		$ 8,000,000	0
Depreciation and amortization		$ 0
Depreciation of fixed assets			8,000,000
Amortization of intangible assets			11,000,000
Cash and cash equivalents from discontinued operations			$ 18,000,000
Maximum | Tempo Business | Discontinued Operations, Disposed of by Sale
Dispositions
Purchase price	4,200,000,000
Deferred consideration	$ 500,000,000