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Integration and Restructuring Costs (Tables)
 12 Months Ended
Dec. 31, 2017
Restructuring and Related Activities [Abstract]  
Restructuring activities
Details of the restructuring liability activity from January 1, 2016 through December 31, 2017, including actions taken prior to 2017, are as follows:
(In millions)
Balance at
1/1/16

 
Expense
Incurred

 
Cash
Paid

 
Other
 
Balance at
12/31/16

 
Expense
Incurred

 
Cash
Paid

 
Other

 
Balance at
12/31/17

Severance
$
15

 
$
40

 
$
(22
)
 
$
(1
)
 
$
32

 
$
31

 
$
(49
)
 
$
1

 
$
15

Future rent under non-cancelable leases and other costs
78

 
4

 
(17
)
 
(4
)
 
61

 
9

 
(22
)
 
2

 
50

Total
$
93

 
$
44

 
$
(39
)
 
$
(5
)
 
$
93

 
$
40

 
$
(71
)
 
$
3

 
$
65