Goodwill and Other Intangible Assets Goodwill and Other Intangible Assets - Additional Disclosure (Details) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Impairment of goodwill	$ 0	$ 0	$ 289,000,000	$ 0	$ 289,000,000