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Debt
 3 Months Ended
Mar. 30, 2019
Debt Disclosure [Abstract]  
Debt
Debt
The following table presents the components of notes payable at March 30, 2019 and December 29, 2018:
 
March 30, 2019
 
December 29, 2018
(millions)
Principal
amount
Effective
interest rate
 
Principal
amount
Effective
interest rate (a)
U.S. commercial paper
$
409

2.68
%
 
$
15

2.75
%
Bank borrowings
196

 
 
161

 
Total
$
605

 
 
$
176