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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2016
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
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
Balance at January 1
 
$
239

 
$
235

 
$
254

 
$

 
$
493

 
$
235

Issuances/accruals during the period
 
316

 
286

 

 
274

 
316

 
560

Settlements made during the period/other
 
(304
)
 
(282
)
 
(185
)
 
(20
)
 
(489
)
 
(302
)
Balance at December 31
 
$
251

 
$
239

 
$
69

 
$
254

 
$
320

 
$
493

Current portion
 
$
189

 
$
185

 
$
69

 
$
155

 
$
258

 
$
340

Non-current portion
 
62

 
54

 

 
99

 
62

 
153

Total
 
$
251

 
$
239

 
$
69

 
$
254

 
$
320

 
$
493

Operating Lease Commitments
At December 31, 2016, we had noncancelable operating lease commitments totaling $936 million. The annual future minimum lease payments are summarized by year in the table below:
Millions of dollars
 
 
2017
 
$
206

2018
 
170

2019
 
141

2020
 
118

2021
 
96

Thereafter
 
205

Total noncancelable operating lease commitments
 
$
936

Purchase Obligations
Our expected cash outflows resulting from non-cancellable purchase obligations are summarized by year in the table below:
Millions of dollars
 
 
2017
 
$
164

2018
 
148

2019
 
147

2020
 
125

2021
 
69

Thereafter
 
111

Total purchase obligations
 
$
764