Supplemental Information On Oil And Gas Operations (Proved Oil Reserves) (Details)	12 Months Ended
Dec. 31, 2014 MMBbls	Dec. 31, 2013 MMBbls	Dec. 31, 2012 MMBbls	Dec. 31, 2011 MMBbls
Reserve Quantities [Line Items]
Conversion rate of gas reserves from barrels of oil to Boe	6
Oil [Member]
Reserve Quantities [Line Items]
Proved developed and undeveloped reserves, beginning balance	285	270	248
Proved developed and undeveloped reserves, revisions due to prices	(1)		(6)
Proved developed and undeveloped reserves, revisions other than price	(37)	(18)	(8)
Proved developed and undeveloped reserves, extensions and discoveries	99	76	72
Proved developed and undeveloped reserves, purchase of reserves	132	1
Proved developed and undeveloped reserves, production	(58)	(43)	(36)
Proved developed and undeveloped reserves, sale of reserves	(46)	(1)
Proved developed and undeveloped reserves, ending balance	374	285	270
Proved developed reserves	278	250	228	219
Proved developed producing reserves	243	229	211	204
Proved undeveloped reserve	96	35	42	29
Oil [Member] \| United States [Member]
Reserve Quantities [Line Items]
Proved developed and undeveloped reserves, beginning balance	229	205	168
Proved developed and undeveloped reserves, revisions due to prices	(1)	1	(1)
Proved developed and undeveloped reserves, revisions other than price	(38)	(18)	(6)
Proved developed and undeveloped reserves, extensions and discoveries	94	69	65
Proved developed and undeveloped reserves, purchase of reserves	132	1
Proved developed and undeveloped reserves, production	(48)	(28)	(21)
Proved developed and undeveloped reserves, sale of reserves	(17)	(1)
Proved developed and undeveloped reserves, ending balance	351	229	205
Proved developed reserves	255	194	166	146
Proved developed producing reserves	224	178	155	139
Proved undeveloped reserve	96	35	39	22
Oil [Member] \| Canada [Member]
Reserve Quantities [Line Items]
Proved developed and undeveloped reserves, beginning balance	56	65	80
Proved developed and undeveloped reserves, revisions due to prices		(1)	(5)
Proved developed and undeveloped reserves, revisions other than price	1		(2)
Proved developed and undeveloped reserves, extensions and discoveries	5	7	7
Proved developed and undeveloped reserves, production	(10)	(15)	(15)
Proved developed and undeveloped reserves, sale of reserves	(29)
Proved developed and undeveloped reserves, ending balance	23	56	65
Proved developed reserves	23	56	62	73
Proved developed producing reserves	19	51	56	65
Proved undeveloped reserve			3	7

Conversion Rate Of Gas Reserves From Mcf To Boe

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Proved Developed And Undeveloped Reserves Revisions Due To Prices

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Proved Developed Producing Reserves Volume

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Additions to proved reserves that result from (1) extension of the proved acreage of previously discovered (old) reservoirs through additional drilling in periods after discovery and (2) discovery of new fields with proved reserves or of new reservoirs of proved reserves in old fields.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 235

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The net quantity of proved reserves as of the balance sheet date. Proved oil reserves are the estimated quantities of crude oil and natural gas liquids which geological and engineering data demonstrate with reasonable certainty to be recoverable.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 10

-Paragraph a

-Subparagraph 2

-Article 4

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Production of proved reserves.

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Purchase of minerals in place.

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-SubTopic 235

-Section 50

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Revisions represent changes in previous estimates of proved reserves, either upward or downward, resulting from new information (except for an increase in proved acreage) normally obtained from development drilling and production history or resulting from change in economic factors.

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Sales of minerals in place.

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Net quantities of an enterprise's interests in proved developed reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas as of the beginning and the end of the year. "Net" quantities of reserves include those relating to the enterprise's operating and nonoperating interests in properties. Quantities of reserves relating to royalty interests owned are included in "net" quantities if the necessary information is available to the enterprise. "Net" quantities does not include reserves relating to interests of others in properties owned by the enterprise. The unit of measure for reserve quantities is defined as "barrels" for oil and synthetic oil reserves or "cubic feet" or "cubic meters" for natural gas and synthetic gas reserves.

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Net quantities of an enterprise's interests in proved undeveloped reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other renewable natural resource that is intended to be upgraded into synthetic oil and gas as of the beginning and the end of the year. "Net" quantities of reserves include those relating to the enterprise's operating and nonoperating interests in properties. Quantities of reserves relating to royalty interests owned are included in "net" quantities if the necessary information is available to the enterprise. "Net" quantities does not include reserves relating to interests of others in properties owned by the enterprise. The unit of measure for reserve quantities is defined as "barrels" for oil and synthetic oil reserves or "cubic feet" or "cubic meters" for natural gas and synthetic gas reserves.

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