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Capital Stock (Tables)
 12 Months Ended
Dec. 28, 2019
Equity [Abstract]  
Common Stock Issued, in Treasury, and Outstanding
Shares of common stock issued, in treasury, and outstanding were (in millions of shares):
 
Shares Issued
 
Treasury Shares
 
Shares Outstanding
Balance at December 31, 2016
1,219

 
(2
)
 
1,217

Exercise of stock options, issuance of other stock awards, and other
2

 
—

 
2

Balance at December 30, 2017
1,221

 
(2
)
 
1,219

Exercise of stock options, issuance of other stock awards, and other
3

 
(2
)
 
1

Balance at December 29, 2018
1,224

 
(4
)
 
1,220

Exercise of stock options, issuance of other stock awards, and other
—

 
1

 
1

Balance at December 28, 2019
1,224

 
(3
)
 
1,221