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Leases (Tables)
12 Months Ended
Dec. 31, 2018
Leases [Abstract]  
Future Minimum Lease Payments
As of December 31, 2018, future minimum lease payments under non-cancelable operating leases (net of sublease income) are as follows:
 
Gross Lease
Commitments
 
Sublease
Income
 
Net Lease
Commitments
 
(in millions)
Year ending December 31:
 
 
2019
$
80

 
$
5

 
$
75

2020
74

 
5

 
69

2021
66

 
4

 
62

2022
48

 
4

 
44

2023
45

 
3

 
42

Thereafter
347

 
2

 
345

Total future minimum lease payments
$
660

 
$
23

 
$
637