Segment Information (Income Statement) (Details) (USD $) In Millions	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Revenues:
Oil, gas and NGL sales	$ 2,111	$ 1,683	$ 6,171	$ 5,535
Oil, gas and NGL derivatives	738	209	986	874
Marketing and midstream revenues	653	461	1,712	1,396
Total revenues	3,502	2,353	8,869	7,805
Expenses and other, net:
Lease operating expenses	475	415	1,352	1,271
Taxes other than income taxes	108	95	336	288
Marketing and midstream operating costs and expenses	515	336	1,304	1,013
Depreciation, depletion and amortization of oil and gas properties	504	397	1,431	1,249
Depreciation and amortization of non-oil and gas properties	62	66	191	192
Accretion of asset retirement obligations	23	21	69	71
General and administrative expenses	138	131	403	399
Restructuring costs	(3)	63	(2)	55
Interest expense	104	83	270	280
Interest-rate and other financial instruments	40	56	33	121
Other, net	(2)	(9)	(14)	(34)
Total expenses and other, net	1,964	1,654	5,373	4,905
Earnings from continuing operations before income taxes	1,538	699	3,496	2,900
Income tax expense (benefit):
Current	(248)	(310)	(301)	696
Deferred	746	580	2,184	349
Total income tax expense	498	270	1,883	1,045
Earnings from continuing operations	1,040	429	1,613	1,855
Capital expenditures, before revision of future asset retirement obligations			5,565	4,999
Revision of future asset retirement obligations			19	194
Capital expenditures, continuing operations	1,950	1,666	5,584	5,193
Canada [Member]
Revenues:
Oil, gas and NGL sales	705	579	2,115	1,917
Oil, gas and NGL derivatives		(5)		3
Marketing and midstream revenues	67	29	149	96
Total revenues	772	603	2,264	2,016
Expenses and other, net:
Lease operating expenses	239	207	684	596
Taxes other than income taxes	12	10	39	30
Marketing and midstream operating costs and expenses	58	22	126	78
Depreciation, depletion and amortization of oil and gas properties	202	163	578	506
Depreciation and amortization of non-oil and gas properties	5	6	17	19
Accretion of asset retirement obligations	14	13	43	38
General and administrative expenses	39	34	119	96
Interest expense	44	47	133	159
Interest-rate and other financial instruments	2	1	2
Other, net	(2)	(2)	(8)	2
Total expenses and other, net	613	501	1,733	1,524
Earnings from continuing operations before income taxes	159	102	531	492
Income tax expense (benefit):
Current	(8)	39	(8)	200
Deferred	48	(10)	143	(55)
Total income tax expense	40	29	135	145
Earnings from continuing operations	119	73	396	347
Capital expenditures, before revision of future asset retirement obligations			1,260	1,452
Revision of future asset retirement obligations			14	122
Capital expenditures, continuing operations	394	308	1,274	1,574
US [Member]
Revenues:
Oil, gas and NGL sales	1,406	1,104	4,056	3,618
Oil, gas and NGL derivatives	738	214	986	871
Marketing and midstream revenues	586	432	1,563	1,300
Total revenues	2,730	1,750	6,605	5,789
Expenses and other, net:
Lease operating expenses	236	208	668	675
Taxes other than income taxes	96	85	297	258
Marketing and midstream operating costs and expenses	457	314	1,178	935
Depreciation, depletion and amortization of oil and gas properties	302	234	853	743
Depreciation and amortization of non-oil and gas properties	57	60	174	173
Accretion of asset retirement obligations	9	8	26	33
General and administrative expenses	99	97	284	303
Restructuring costs	(3)	63	(2)	55
Interest expense	60	36	137	121
Interest-rate and other financial instruments	38	55	31	121
Other, net		(7)	(6)	(36)
Total expenses and other, net	1,351	1,153	3,640	3,381
Earnings from continuing operations before income taxes	1,379	597	2,965	2,408
Income tax expense (benefit):
Current	(240)	(349)	(293)	496
Deferred	698	590	2,041	404
Total income tax expense	458	241	1,748	900
Earnings from continuing operations	921	356	1,217	1,508
Capital expenditures, before revision of future asset retirement obligations			4,305	3,547
Revision of future asset retirement obligations			5	72
Capital expenditures, continuing operations	$ 1,556	$ 1,358	$ 4,310	$ 3,619

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