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Restructuring (Tables)
 3 Months Ended
Mar. 31, 2016
Restructuring and Related Activities [Abstract]  
Schedule of restructuring reserve by type of cost
The following table shows the balances and activity for restructuring charges:
(in millions)
Severance and Related Costs
Lease Restructuring
Liability as of January 1, 2016
$
52

$
415

Additional costs and expenses
1

—

Payments
(31
)
(22
)
Liability as of March 31, 2016
$
22

$
393