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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Commitments for Operating Leases
The following table summarizes our minimum commitments under noncancelable operating leases having initial terms in excess of one year, primarily for property:

2019

2020

2021

2022

2023

Thereafter
 
Total
Minimum commitments(a)
$
296


$
286


$
247


$
180


$
146


$
582

 
$
1,737

Sublease income
(61
)

(51
)

(44
)

(38
)

(33
)

(129
)
 
(356
)
Net minimum commitments
$
235


$
235


$
203


$
142


$
113


$
453

 
$
1,381

__________
(a)
Certain leases contain escalation clauses and renewal or purchase options.