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Restructuring (Tables)
6 Months Ended
Jun. 30, 2017
Restructuring and Related Activities [Abstract]  
Schedule of restructuring reserve by type of cost The following table shows the balances and activity for lease restructuring charges:
(in millions)
Lease Restructuring
Liability as of January 1, 2017
$
329

Payments
(47
)
Additional expenses and other
(10
)
Liability as of June 30, 2017
$
272