Goodwill, Customer Relationships and Other Intangible Assets Goodwill, Customer Relationships and Other Intangible Assets (Details 5) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Business Acquisition [Line Items]
Goodwill acquired during period		$ 92
Goodwill purchase accounting adjustment	$ (13)	$ (11)
Various Business Acquisitions [Member]
Business Acquisition [Line Items]
Number of businesses acquired		2
Payments to acquire businesses, net of cash acquired		$ 95
Cash acquired from business acquisition		2
Goodwill acquired during period		$ 92
Goodwill purchase accounting adjustment	(14)
Finite-Lived intangible assets purchase accounting adjustment	13
Deferred tax assets purchase accounting adjustment	$ (1)