Goodwill and Other Intangible Assets (Details 2) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Goodwill and Other Intangible Assets
Other indefinite-lived intangible assets	$ 137	$ 130
Carrying value of definite-lived intangible assets	27	12
Accumulated amortization	48	$ 48
Increase in other indefinite-lived intangible assets	7
Increase in definite-lived intangible assets	$ 17