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Leases (Tables)
12 Months Ended
Dec. 31, 2016
Leases [Abstract]  
Schedule of Future Minimum Lease Payments
Future minimum lease payments as of December 31, 2016, for operating and capital lease obligations were:
 
 
Millions of Dollars
 
Capital Lease Obligations

 
Operating Lease Obligations

 
 
 
 
2017
$
26

 
404

2018
19

 
362

2019
18

 
276

2020
14

 
200

2021
14

 
85

Remaining years
150

 
229

Total
241

 
1,556

Less: income from subleases

 
60

Net minimum lease payments
$
241

 
1,496

Less: amount representing interest
53

 
 
Capital lease obligations
$
188

 
 
Schedule of Operating Lease Rental Expense
Operating lease rental expense for the years ended December 31 was:
 
 
Millions of Dollars
 
2016

 
2015

 
2014

 
 
 
 
 
 
Minimum rentals
$
641

 
641

 
570

Contingent rentals
6

 
6

 
8

Less: sublease rental income
95

 
136

 
135

 
$
552

 
511

 
443