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Income Taxes (Tables)
 9 Months Ended
Sep. 29, 2018
Income Tax Disclosure [Abstract]  
Reconciliation of Total Gross Unrecognized Tax Benefits
(millions)
December 30, 2017
$
60

Tax positions related to current year:
 
Additions
5

Reductions
—

Tax positions related to prior years:
 
Additions
2

Reductions
(11
)
Settlements
(4
)
Lapse in statute of limitations
(1
)
September 29, 2018
$
51