STATEMENT OF CONSOLIDATED OPERATIONS (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Oil and gas production revenues:
Oil and gas production revenues	$ 16,402	$ 16,947	$ 16,810
Derivative instrument gains (losses), net	(399)	(79)
Other	51	210	78
Total revenues and other	16,054	17,078	16,888
Oil and gas property and equipment
Recurring	5,114	4,812	3,814
Additional	1,176	1,926	109
Other assets	410	371	281
Asset retirement obligation accretion	243	232	154
Lease operating expenses	3,056	2,968	2,605
Gathering and transportation	297	303	296
Taxes other than income	832	862	899
General and administrative	503	531	459
Acquisitions, divestitures and transition	33	31	20
Financing costs, net	174	165	158
Total operating expenses	11,838	12,201	8,795
INCOME BEFORE INCOME TAXES	4,216	4,877	8,093
Current income tax provision	1,665	2,199	2,263
Deferred income tax provision	263	677	1,246
NET INCOME (LOSS) INCLUDING NONCONTROLLING INTEREST	2,288	2,001	4,584
Net income attributable to noncontrolling interest	56
Preferred stock dividends	44	76	76
NET INCOME ATTRIBUTABLE TO COMMON STOCK	2,188	1,925	4,508
NET INCOME PER COMMON SHARE:
Basic	$ 5.53	$ 4.95	$ 11.75
Diluted	$ 5.50	$ 4.92	$ 11.47
WEIGHTED-AVERAGE NUMBER OF COMMON SHARES OUTSTANDING:
Basic	395	389	384
Diluted	406	391	400
DIVIDENDS DECLARED PER COMMON SHARE	$ 0.80	$ 0.68	$ 0.60
Oil Reserves [Member]
Oil and gas production revenues:
Revenues	12,903	13,210	12,679
Natural Gas [Member]
Oil and gas production revenues:
Revenues	2,829	3,193	3,609
Natural Gas Liquids Revenues [Member]
Oil and gas production revenues:
Revenues	$ 670	$ 544	$ 522