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Lease Commitments
 12 Months Ended
Dec. 31, 2016
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
2016
 
2015
 
2014
Rental expense
$
400

 
$
454

 
$
455

Less: Sub lease rental income
(64
)
 
(83
)
 
(75
)
Net rental expense
$
336

 
$
371

 
$
380


At December 31, 2016, 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):
Years ended December 31, 2016
Gross rental commitments
 
Rentals from subleases
 
Net rental commitments
2017
$
355

 
$
(55
)
 
$
300

2018
317

 
(44
)
 
273

2019
283

 
(38
)
 
245

2020
237

 
(34
)
 
203

2021
214

 
(33
)
 
181

Thereafter
696

 
(47
)
 
649

Total minimum payments required
$
2,102

 
$
(251
)
 
$
1,851