Equity Investments (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Equity Investments	$ 66	$ 76
Net Income (Loss) from equity investments	$ 2	3	$ 9
Impairment of equity investments		$ 25
Proserv Group Business [Domain]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Realized Gain (Loss) on Disposal			$ 65