Guarantees, Commitments and Contingencies (Details 2) $ in Millions	6 Months Ended
	Jun. 30, 2017 USD ($) claims Classes
Loss Contingencies [Line Items]
Taco Bell Wage and Hour Actions - Number of proposed classes concerning meals and rest breaks at Taco Bell for which plaintiffs sought certification | Classes	4
Taco Bell Wage and Hour Actions - Number of proposed classes concerning meals and rest breaks at Taco Bell which were rejected by the District Court | Classes	3
Taco Bell Wage and Hour Actions - Number of California Private Attorney General Act claims not dismissed | claims	1
Taco Bell Wage and Hour Actions - Amount awarded to plaintiffs for the underpaid meal premium class	$ 0.5
Taco Bell Wage and Hour Actions - Amount of prejudgement interest awarded to plaintiffs for the underpaid meal premium class	$ 0.3
Taco Bell Wage and Action - Number of Plaintiffs the court denied enhanced awards | Classes	2
Taco Bell Wage and Hour Actions - Amount of attorneys' fees awarded by the court	$ 1.1
Taco Bell Wage and Actions - Amount of attorneys' fees requested by the Plaintiffs	7.3
Taco Bell Wage and Hour Action - Amount of bill of costs awarded by the court	0.1
Taco Bell Wage and Hour Action - Amount of bill of costs requested by the Plaintiffs	$ 0.2