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Restructuring Costs (Tables)
 3 Months Ended
Mar. 31, 2018
Restructuring and Related Activities [Abstract]  
Restructuring Activities
Details of the restructuring activity from January 1, 2017 through March 31, 2018, which includes liabilities from actions prior to 2018, are as follows:
(In millions)
Liability at 1/1/17
 
Amounts
Accrued
 
Cash
Paid
 
Other 
 
Liability at 12/31/17
 
Amounts
Accrued
 
Cash
Paid
 
Other 
 
Liability at 3/31/18
Severance
$
32

 
$
31

 
$
(49
)
 
$
1

 
$
15

 
$
5

 
$
(4
)
 
$
(1
)
 
$
15

Future rent under non-cancelable leases and other costs
61

 
9

 
(22
)
 
2

 
50

 
1

 
(4
)
 
1

 
48

Total
$
93

 
$
40

 
$
(71
)
 
$
3

 
$
65

 
$
6

 
$
(8
)
 
$
—

 
$
63