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Leases
12 Months Ended
Dec. 31, 2014
Leases [Abstract]  
Leases
LEASES
 
We lease our offices and other property through operating leases.  Rental expense is charged to operations as incurred.  For 2014, 2013 and 2012, total rental expense for operating leases was $17 million, $17 million and $16 million, respectively.  At December 31, 2014, minimum payments for operating leases having initial non-cancelable terms in excess of one year were as follows: 
(Millions of dollars)
 
2015
$
16

2016
13

2017
12

2018
11

2019
10

Thereafter
21

Total
$
83