Income Taxes - U.S. Tax Reform (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 30, 2017	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
U.S. Tax Reform
U.S. federal statutory income tax rate (as a percent)			35.00%	35.00%	35.00%
Income tax expense charge to reflect provisional estimate of the net impact of Tax Cuts and Jobs Act	$ 266		$ 266
Remeasurement of U.S. deferred tax assets and liabilities	154		154
One-time transition tax on post-1986 earnings	112		112
Post-1986 earnings and profits previously deferred from U.S. income taxes used as basis for one-time transition tax	$ 1,600		$ 1,600
Forecast
U.S. Tax Reform
U.S. federal statutory income tax rate (as a percent)		21.00%