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Restructuring (Tables)
 9 Months Ended
Sep. 30, 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
15

—

Payments
(48
)
(63
)
Liability as of September 30, 2016
$
19

$
352