Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Allowance for doubtful accounts
Valuation and Qualifying Accounts
Balance at beginning of year	$ 27	$ 33	$ 30
Charged to costs and expenses	3	3	5
Deductions from reserves	(3)	(9)	(2)
Balance at end of year	27	27	33
Inventory FIFO reserves
Valuation and Qualifying Accounts
Balance at beginning of year	231	206	169
Charged to costs and expenses	63	59	56
Deductions from reserves	(32)	(34)	(19)
Balance at end of year	$ 262	$ 231	$ 206