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Income Taxes (Tables)
 3 Months Ended
Apr. 01, 2017
Income Tax Disclosure [Abstract]  
Reconciliation of Total Gross Unrecognized Tax Benefits
(millions)
December 31, 2016
$
63

Tax positions related to current year:
 
Additions
1

Reductions
—

Tax positions related to prior years:
 
Additions
1

Reductions
(5
)
Settlements
—

Lapse in statute of limitations
—

April 1, 2017
$
60