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Restructuring (Tables)
12 Months Ended
Dec. 31, 2017
Restructuring and Related Activities [Abstract]  
Schedule of restructuring reserve and activity The following table shows the balances and activity for restructuring charges:
(in millions)
2017
2016
2015
Liability at beginning of period
$
333

$
467

$
504

Payments
(103
)
(144
)
(127
)
Additional expenses and other
7

10

90

Liability at end of period
$
237

$
333

$
467