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Restructuring Costs (Tables)
 9 Months Ended
Sep. 30, 2017
Restructuring and Related Activities [Abstract]  
Restructuring Activities
Details of the restructuring activity from January 1, 2016 through September 30, 2017, which includes liabilities from actions prior to 2017, are as follows:
(In millions)
Liability at 1/1/16
 
Amounts
Accrued
 
Cash
Paid
 
Other 
 
Liability at 12/31/16
 
Amounts
Accrued
 
Cash
Paid
 
Other 
 
Liability at 9/30/17
Severance
$
15

 
$
40

 
$
(22
)
 
$
(1
)
 
$
32

 
$
24

 
$
(42
)
 
$
—

 
$
14

Future rent under non-cancelable leases and other costs
78

 
4

 
(17
)
 
(4
)
 
61

 
8

 
(15
)
 
1

 
55

Total
$
93

 
$
44

 
$
(39
)
 
$
(5
)
 
$
93

 
$
32

 
$
(57
)
 
$
1

 
$
69