Income Taxes (Tables)

9 Months Ended

Sep. 30, 2018

Income Taxes [Abstract]

Schedule Of Effective Income Tax Rate Reconciliation [Table Text Block]

		Millions of Dollars					Percent of Pre-Tax Income (Loss)
		Three Months Ended			Nine Months Ended		Three Months Ended			Nine Months Ended
		September 30			September 30		September 30			September 30
			2018	2017	2018	2017	2018		2017	2018	2017
Income (loss) before income taxes
	United States	$	893	(197)	2,799	(5,259)	30.7	%	(30.2)	38.3	133.5
	Foreign		2,013	850	4,502	1,319	69.3		130.2	61.7	(33.5)
		$	2,906	653	7,301	(3,940)	100.0	%	100.0	100.0	100.0
Federal statutory income tax		$	610	228	1,533	(1,379)	21.0	%	35.0	21.0	35.0
Non-U.S. effective tax rates			479	137	1,339	503	16.5		21.0	18.3	(12.8)
Canada disposition			-	(8)	-	(1,176)	-		(1.2)	-	29.8
Recovery of outside basis			(16)	(118)	(19)	(957)	(0.6)		(18.1)	(0.2)	24.3
Adjustment to tax reserves			(3)	(17)	2	764	(0.1)		(2.6)	-	(19.4)
Adjustment to valuation allowance			(29)	-	13	24	(1.0)		-	0.2	(0.6)
APLNG impairment			-	-	-	834	-		-	-	(21.2)
State income tax			38	14	83	(98)	1.3		2.1	1.1	2.5
Enhanced oil recovery credit			(36)	(5)	(73)	(49)	(1.3)		(0.8)	(1.0)	1.2
Other			(10)	(14)	(4)	(15)	(0.3)		(2.2)	-	0.5
		$	1,033	217	2,874	(1,549)	35.5	%	33.2	39.4	39.3