Summary of Significant Accounting Policies (Details 2) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) Years	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jan. 01, 2018 USD ($)
Fiscal Period Adjustment [Line Items]
Goodwill Written Off Related To Sale Of Business Unit Years From Acquisition	2
Fair Value Goodwill Written Off Related To Sale Of Business Unit Minimum Years Refranchised	2
Number of years notes receivable and direct financing leases are beyond and would be included in other assets	1
Number of years notes receivable and direct financing leases are due within and would be included in accounts and notes receivable	1
Number of consecutive years of operating losses used as primary indicator of potential impairment for our semi-annual impairment testing of restaurant assets	2
Accumulated Deficit | $	$ 7,480	$ 7,628
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Fiscal Period Adjustment [Line Items]
Accumulated Deficit | $			$ 251	$ (240)
Accounting Standards Update 2016-13 [Member]
Fiscal Period Adjustment [Line Items]
Accumulated Deficit | $	$ 8