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

Tax positions related to current year:
 
Additions
3

Reductions
—

Tax positions related to prior years:
 
Additions
2

Reductions
(6
)
Settlements
(2
)
Lapse in statute of limitations
—

June 30, 2018
$
57