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Lease Commitments (Tables)
 12 Months Ended
Dec. 31, 2017
Leases, Operating [Abstract]  
Rental expenses for operating leases
Rental expenses (including amounts applicable to taxes, insurance, and maintenance) for operating leases are as follows (in millions):
Years Ended December 31
2017
 
2016
 
2015
Rental expense
$
377

 
$
358

 
$
413

Sub lease rental income
(57
)
 
(52
)
 
(73
)
Net rental expense
$
320

 
$
306

 
$
340
Future minimum rental payments under operating leases for continuing operations that have initial or remaining noncancelable lease terms in excess of one year, net of sublease rental income
At December 31, 2017, future minimum rental payments required under operating leases that have initial or remaining non-cancelable lease terms in excess of one year are as follows (in millions):
Year Ended December 31, 2017
Gross rental commitments
 
Rentals from subleases
 
Net rental commitments
2018
$
318

 
$
(41
)
 
$
277

2019
291

 
(42
)
 
249

2020
249

 
(35
)
 
214

2021
226

 
(34
)
 
192

2022
205

 
(34
)
 
171

Thereafter
631

 
(18
)
 
613

Total minimum payments required
$
1,920

 
$
(204
)
 
$
1,716