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Lease Commitments
 12 Months Ended
Dec. 31, 2017
Leases, Operating [Abstract]  
Lease Commitments
Lease Commitments
The Company leases office facilities, equipment, and automobiles under non-cancelable operating leases. These leases expire at various dates and may contain renewal and expansion options. In addition to base rental costs, occupancy lease agreements generally provide for rent escalations resulting from increased assessments for real estate taxes and other charges. The Company’s lease obligations are primarily for the use of office space.
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


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