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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Rental Expense for Property and Equipment Under Operating Lease Agreements
Rental expense for property and equipment under all operating lease agreements is as follows:
(in millions)
Year ended December 31,
 
2018
 
2017
 
2016
Gross rental expense
$
172

 
$
177

 
$
179

Less: sublease revenue
(17
)
 
(17
)
 
(16
)
Net rental expense
$
155

 
$
160

 
$
163

Schedule of Future Minimum Rental Commitments
Cash amounts for future minimum rental commitments under existing non-cancelable leases with a remaining term of more than one year, along with minimum sublease rental income to be received under non-cancelable subleases are shown in the following table.
(in millions)
Rent
commitment
 
Sublease
income
 
Net rent
2019
$
130

 
$
(17
)
 
$
113

2020
102

 
(3
)
 
99

2021
85

 

 
85

2022
75

 

 
75

2023
67

 

 
67

2024 and beyond
400

 

 
400

Total
$
859

 
$
(20
)
 
$
839