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Leased Assets (Tables)
 12 Months Ended
Dec. 31, 2017
Leases [Abstract]  
Net Rental Expense
Net rental expense comprised the following:
(In millions)
2017
 
2016
 
2015
Gross rental expense
$
332

 
$
332

 
$
324

Sublease rental income
(17
)
 
(27
)
 
(33
)
 
$
315

 
$
305

 
$
291
Minimum Future Lease Payments
The following table presents minimum future lease payments:
 
 
 
 
 
 
 
 
 
 
 
2023 and
 
 
(In millions)
2018
 
2019
 
2020
 
2021
 
2022
 
Beyond
 
Total
Capital Leases
 

 
 

 
 

 
 

 
 
 
 

 
 

Minimum lease payments
$
10

 
$
7

 
$
6

 
$
18

 
$
2

 
$
24

 
$
67

Imputed interest
(3
)
 
(3
)
 
(3
)
 
(3
)
 
(1
)
 
(14
)
 
(27
)
Present value
$
7

 
$
4

 
$
3

 
$
15

 
$
1

 
$
10

 
$
40

Operating Leases
 

 
 

 
 

 
 

 
 
 
 

 
 

Minimum lease payments
$
265

 
$
202

 
$
156

 
$
110

 
$
63

 
$
250

 
$
1,046

Minimum sublease rentals
(12
)
 
(8
)
 
(6
)
 
(3
)
 
(2
)
 
(7
)
 
(38
)
 
$
253

 
$
194

 
$
150

 
$
107

 
$
61

 
$
243

 
$
1,008

Imputed interest
 

 
 

 
 

 
 

 
 
 
 

 
(161
)
Present value
 

 
 

 
 

 
 

 
 
 
 

 
$
847