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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Total rent expense under operating leases Total rent expense for the three years ended December 31, 2018 was as follows:
(in millions)
Total
2018
$
81

2017
70

2016
63
Minimum rental payments under operating leases At December 31, 2018, we are obligated to make minimum rental payments under operating leases which are as follows:
(in millions)
2019
 
2020
 
2021
 
2022
 
2023
 
Thereafter
Minimum rental payments
$
76

 
$
61

 
$
43

 
$
33

 
$
22

 
$
64
Changes in product warranty accrual The table below provides changes in the combined current and non-current product warranty accruals over each period.
(in millions)
2018
 
2017
Warranty accrual – January 1
$
82

 
$
99

Net charges for product warranties in the period
20

 
28

Settlement of warranty claims
(42
)
 
(48
)
Foreign currency and other
—

 
3

Warranty accrual – December 31
$
60

 
$
82