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Restructuring (Tables)
 12 Months Ended
Dec. 31, 2018
Restructuring and Related Activities [Abstract]  
Schedule of restructuring reserve and activity The following table shows the balances and activity for restructuring charges:
(in millions)
2018
2017
2016
Liability at beginning of period
$
237

$
333

$
467

Reclassified to lease liability
(195
)
—

—

Payments
(5
)
(103
)
(144
)
Additional expenses and other
1

7

10

Liability at end of period
$
38

$
237

$
333