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Lease Commitments (Tables)
 12 Months Ended
Dec. 31, 2018
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
2018
 
2017
 
2016
Rental expense
$
374

 
$
377

 
$
358

Sub lease rental income
(45
)
 
(57
)
 
(52
)
Net rental expense
$
329

 
$
320

 
$
306
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, 2018, 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, 2018
Gross rental commitments
 
Rentals from subleases
 
Net rental commitments
2019
$
303

 
$
(34
)
 
$
269

2020
253

 
(30
)
 
223

2021
221

 
(30
)
 
191

2022
182

 
(30
)
 
152

2023
148

 
(12
)
 
136

Thereafter
472

 
(5
)
 
467

Total minimum payments required
$
1,579

 
$
(141
)
 
$
1,438