Lease Commitments (Tables)

12 Months Ended

Dec. 31, 2016

Leases [Abstract]

Schedule of capitalized leased assets

Details of the capitalized leased assets are as follows:

	At December 31
	2016		2015
Upstream	$	676	$	800
Downstream	99		98
All Other	—		—
Total	775		898
Less: Accumulated amortization	383		448
Net capitalized leased assets	$	392	$	450

Rental expenses incurred for operating leases

Rental expenses incurred for operating leases during 2016, 2015 and 2014 were as follows:

	Year ended December 31
	2016		2015		2014
Minimum rentals	$	943	$	1,041	$	1,080
Contingent rentals	2		2		1
Total	945		1,043		1,081
Less: Sublease rental income	7		9		14
Net rental expense	$	938	$	1,034	$	1,067

Estimated future minimum lease payments (net of noncancelable sublease rentals) under operating and capital leases

At December 31, 2016, 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	2017	$	615	$	22
	2018	554		20
	2019	387		21
	2020	298		12
	2021	235		12
	Thereafter	392		145
Total		$	2,481	$	232
Less: Amounts representing interest and executory costs				$	(125	)
Net present values				107
Less: Capital lease obligations included in short-term debt				(14		)
Long-term capital lease obligations				$	93