Debt (Tables)

3 Months Ended

Mar. 31, 2018

Debt Disclosure [Abstract]

Components of Notes Payable

	March 31, 2018				December 30, 2017
(millions)	Principal amount		Effective interest rate (a)		Principal amount		Effective interest rate (a)
U.S. commercial paper	$	191	2.15	%	$	196	1.76	%
Europe commercial paper	197		(0.31	)%	96		(0.32	)%
Bank borrowings	81				78
Total	$	469			$	370

(a) Negative effective interest rates on certain borrowings in Europe are the result of efforts by the European Central Bank to stimulate the economy in the eurozone.