Segment Reporting Long-lived Assets by Geography (Details) - USD ($) $ in Millions	Dec. 29, 2018	Dec. 30, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 93,049	$ 111,318
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	79,057	92,504
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	3,620	6,585
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	4,996	6,226
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 5,376	$ 6,003