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Lease Commitments
 12 Months Ended
Dec. 31, 2018
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, may contain renewal and expansion options, and do not contain restrictions concerning dividends or incurring additional debt. 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 total amount of the minimum rent is expensed on a straight-line basis over the lease term. The Company’s lease obligations are primarily for the use of office space and certain real-estate properties are subleased to third parties.
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



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