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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Future minimum rentals for leases having initial or remaining noncancelable lease terms in excess of one year
As of December 31, 2018, our future minimum rentals for leases having initial or remaining noncancelable lease terms in excess of one year were as follows (in millions):
2019
$
359

2020
245

2021
178

2022
146

2023
123

Thereafter
514

Total minimum rental payments
$
1,565

Rental expense for all operating leases
Rental expense, net of sublease rental income was as follows (in millions):
 
Year Ended December 31,
 
2018
 
2017
 
2016
Minimum rental expense
$
515

 
$
691

 
$
739

Contingent rental expense
19

 
21

 
70

Total rental expense
534

 
712

 
809

Less sublease rental income
31

 
54

 
31

Rental expense, net of
sublease rental income
$
503

 
$
658

 
$
778