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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Product Warranty and Legacy Product Corrective Action Reserves
The following table summarizes the changes in total product warranty and legacy product warranty liability reserves for the periods presented:
 
 
Product Warranty
 
Legacy Product Warranty
 
Total
Millions of dollars
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Balance at January 1
 
$
251

 
$
239

 
$
69

 
$
254

 
$
320

 
$
493

Issuances/accruals during the period
 
331

 
316

 
1

 

 
332

 
316

Settlements made during the period/other
 
(305
)
 
(304
)
 
(70
)
 
(185
)
 
(375
)
 
(489
)
Balance at December 31
 
$
277

 
$
251

 
$

 
$
69

 
$
277

 
$
320

Current portion
 
$
203

 
$
189

 
$

 
$
69

 
$
203

 
$
258

Non-current portion
 
74

 
62

 

 

 
74

 
62

Total
 
$
277

 
$
251

 
$

 
$
69

 
$
277

 
$
320

Operating Lease Commitments
At December 31, 2017, we had noncancelable operating lease commitments totaling $976 million. The annual future minimum lease payments are summarized by year in the table below:
Millions of dollars
 
2018
$
222

2019
187

2020
154

2021
108

2022
86

Thereafter
219

Total noncancelable operating lease commitments
$
976

Purchase Obligations
Our expected cash outflows resulting from non-cancellable purchase obligations are summarized by year in the table below:
Millions of dollars
 
2018
$
179

2019
149

2020
129

2021
57

2022
55

Thereafter
45

Total purchase obligations
$
614