Franchises, Goodwill and Other Intangible Assets Other Intangibles Assets Amortization Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Finite-lived intangible assets, amortization expense	$ 67	$ 75	$ 205	$ 227