Franchises, Goodwill and Other Intangible Assets Other Intangibles Assets Amortization Expense (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]
Finite-lived intangible assets, amortization expense	$ 75	$ 82	$ 227	$ 219