Financial and Derivative Instruments (Tables)

12 Months Ended

Dec. 31, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Consolidated Balance Sheet: Fair Value of Derivatives not Designated as Hedging Instruments

Consolidated Balance Sheet: Fair Value of Derivatives Not Designated as Hedging Instruments

				At December 31
Type of Contract	Balance Sheet Classification	2017		2016
Commodity	Accounts and notes receivable, net	$	22	$	30
Commodity	Long-term receivables, net	—		2
Total assets at fair value		$	22	$	32
Commodity	Accounts payable	$	122	$	99
Commodity	Deferred credits and other noncurrent obligations	2		10
Total liabilities at fair value		$	124	$	109

Consolidated Statement of Income: The Effect of Derivatives not Designated as Hedging Instruments

Consolidated Statement of Income: The Effect of Derivatives Not Designated as Hedging Instruments

		Gain/(Loss)
Type of Derivative	Statement of	Year ended December 31
Contract	Income Classification	2017			2016			2015
Commodity	Sales and other operating revenues	$	(105	)	$	(269	)	$	277
Commodity	Purchased crude oil and products	(9		)	(31		)	30
Commodity	Other income	(2		)	—			(3		)
		$	(116	)	$	(300	)	$	304

Consolidated Balance Sheet: The Effect of Netting Derivative Assets

The table below represents gross and net derivative assets and liabilities subject to netting agreements on the Consolidated Balance Sheet at December 31, 2017 and December 31, 2016.

Consolidated Balance Sheet: The Effect of Netting Derivative Assets and Liabilities

	Gross Amounts Recognized		Gross Amounts Offset		Net Amounts Presented		Gross Amounts Not Offset		Net Amounts
At December 31, 2017
Derivative Assets	$	1,169	$	1,147	$	22	$	—	$	22
Derivative Liabilities	$	1,271	$	1,147	$	124	$	—	$	124
At December 31, 2016
Derivative Assets	$	1,052	$	1,020	$	32	$	—	$	32
Derivative Liabilities	$	1,129	$	1,020	$	109	$	—	$	109

Consolidated Balance Sheet: The Effect of Netting Derivative Liabilities

The table below represents gross and net derivative assets and liabilities subject to netting agreements on the Consolidated Balance Sheet at December 31, 2017 and December 31, 2016.

Consolidated Balance Sheet: The Effect of Netting Derivative Assets and Liabilities

	Gross Amounts Recognized		Gross Amounts Offset		Net Amounts Presented		Gross Amounts Not Offset		Net Amounts
At December 31, 2017
Derivative Assets	$	1,169	$	1,147	$	22	$	—	$	22
Derivative Liabilities	$	1,271	$	1,147	$	124	$	—	$	124
At December 31, 2016
Derivative Assets	$	1,052	$	1,020	$	32	$	—	$	32
Derivative Liabilities	$	1,129	$	1,020	$	109	$	—	$	109