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Lease Commitments (Tables)
12 Months Ended
Dec. 31, 2017
Leases [Abstract]  
Schedule of capitalized leased assets
Details of the capitalized leased assets are as follows:
 
At December 31
 
 
2017

 
 
2016

Upstream
$
678

 
 
$
676

Downstream
99

 
 
99

All Other

 
 

Total
777

 
 
775

Less: Accumulated amortization
515

 
 
383

Net capitalized leased assets
$
262

 
 
$
392

Rental expenses incurred for operating leases
Rental expenses incurred for operating leases during 2017, 2016 and 2015 were as follows:
 
Year ended December 31
 
 
2017

 
 
2016

 
2015

Minimum rentals
$
726

 
 
$
943

 
$
1,041

Contingent rentals
1

 
 
2

 
2

Total
727

 
 
945

 
1,043

Less: Sublease rental income
6

 
 
7

 
9

Net rental expense
$
721

 
 
$
938

 
$
1,034

Estimated future minimum lease payments (net of noncancelable sublease rentals) under operating and capital leases
At December 31, 2017, the estimated future minimum lease payments (net of noncancelable sublease rentals) under operating and capital leases, which at inception had a noncancelable term of more than one year, were as follows:
 
 
At December 31
 
 
 
Operating Leases

 
 
Capital Leases

Year
2018
$
693

 
 
$
26

 
2019
628

 
 
22

 
2020
474

 
 
13

 
2021
339

 
 
12

 
2022
223

 
 
11

 
Thereafter
538

 
 
142

Total
$
2,895

 
 
$
226

Less: Amounts representing interest and executory costs
 
 
 
$
(117
)
Net present values
 
 
 
109

Less: Capital lease obligations included in short-term debt
 
 
 
(15
)
Long-term capital lease obligations
 
 
 
$
94