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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]  
Product Warranty Reserves The following table summarizes the changes in total product warranty reserves for the periods presented:
 
 
Product Warranty
Millions of dollars
 
2019
 
2018
Balance at January 1
 
$
268

 
$
277

Issuances/accruals during the period
 
350

 
289

Settlements made during the period/other
 
(235
)
 
(294
)
Reclassification of product warranty to held for sale
 

 
(4
)
Balance at December 31
 
$
383

 
$
268

Current portion
 
$
254

 
$
194

Non-current portion
 
129

 
74

Total
 
$
383

 
$
268


Purchase Obligations
Our expected cash outflows resulting from non-cancellable purchase obligations are summarized by year in the table below:
Millions of dollars
 
2020
$
205

2021
171

2022
119

2023
81

2024
39

Thereafter
57

Total purchase obligations
$
672