Income Taxes Change in Valuation Allowance Against Deferred Tax Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Income Tax Disclosure [Abstract]
Balance at beginning of year	$ 166	$ 153	$ 131
Additions charged to income tax expense	25	29	35
Reductions credited to income tax expense	(47)	(1)	(28)
Currency translation adjustments	2	(15)	15
Balance at end of year	$ 146	$ 166	$ 153