Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Prepaid Expenses and Other Current Assets [Line Items]
Income tax receivable		$ 35	$ 39
Restricted Cash and Cash Equivalents, Current		258	138
Assets held for sale	[1]	7	25
Prepaid expenses and other current assets		125	136
Prepaid Expense and Other Assets, Current		425	338
Property, Plant and Equipment [Line Items]
Property, Plant and equipment, gross		2,465	2,306
Accumulated depreciation and amortization		(1,230)	(1,136)
Property, Plant and equipment, net		1,235	1,170
Depreciation and amortization		132	114	$ 146
Other Assets, Noncurrent [Line Items]
Operating Lease, Right-of-Use Asset		851	642
Other assets		1,435	1,313
Other Assets, Miscellaneous, Noncurrent		421	360
Proceeds from Sale, Maturity and Collection of Investments		206
Accounts Payable and Other Current Liabilities [Line Items]
Accounts payable and other current liabilities		1,189	960
Franchise Incentive [Member]
Other Assets, Noncurrent [Line Items]
Other assets		163	174
Land
Property, Plant and Equipment [Line Items]
Property, Plant and equipment, gross		428	408
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, Plant and equipment, gross		1,423	1,325
Finance leases, primarily buildings
Property, Plant and Equipment [Line Items]
Property, Plant and equipment, gross		71	68
Machinery, Equipment and Other
Property, Plant and Equipment [Line Items]
Property, Plant and equipment, gross		543	505
GrubHub Inc. [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Other Assets, Noncurrent [Line Items]
Equity Securities, FV-NI	[2]	0	137
Accounts Payable and Accrued Liabilities [Member]
Accounts Payable and Other Current Liabilities [Line Items]
Accounts payable		215	173
Accrued compensation and benefits		225	223
Accrued Advertising, Current		196	96
Operating Lease, Liability, Current		97	67
Accrued taxes, other than income taxes		36	52
Other current liabilities		$ 420	$ 349

[1] (a)    Reflects the carrying value of restaurants we have offered for sale to franchisees and excess properties that we do not intend to use for restaurant operations in the future.

[2] (b)    In the third quarter of 2020 we sold our entire investment in Grubhub, Inc. common stock and received proceeds of $206 million.