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Accounting For Suspended Exploratory Well Costs (Schedule Of Additional Detail For The Projects) (Details) (USD $)
In Millions, unless otherwise specified
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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Dec. 31, 2008
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| Exploratory Wells Drilled [Line Items] |
|
|
|
|
| Capitalized exploratory well costs |
$ 2,881 |
$ 2,893 |
$ 2,005 |
$ 1,585 |
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Total 32 Projects [Member]
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| Exploratory Wells Drilled [Line Items] |
|
|
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| Capitalized exploratory well costs |
1,133 |
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Angola [Member] | Project In Angola - Perpetua-Zina- Acacia [Member]
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| Exploratory Wells Drilled [Line Items] |
|
|
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| Capitalized exploratory well costs |
15 |
|
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| Years wells drilled, period |
2008 - 2009 |
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|
|
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Australia [Member] | Project In Australia - East Pilchard [Member]
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| Exploratory Wells Drilled [Line Items] |
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| Capitalized exploratory well costs |
10 |
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| Years wells drilled, period |
2001 |
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Australia [Member] | Projects In Australia - SE Longtom [Member]
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| Exploratory Wells Drilled [Line Items] |
|
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| Capitalized exploratory well costs |
15 |
|
|
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| Years wells drilled, period |
2010 |
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Indonesia [Member] | Project In Indonesia - Natuna [Member]
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| Exploratory Wells Drilled [Line Items] |
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|
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| Capitalized exploratory well costs |
118 |
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| Years wells drilled, period |
1981 - 1983 |
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Kazakhstan [Member] | Project In Kazakhstan - Kairan [Member]
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| Exploratory Wells Drilled [Line Items] |
|
|
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| Capitalized exploratory well costs |
53 |
|
|
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| Years wells drilled, period |
2004 - 2007 |
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Malaysia [Member] | Project In Malaysia - Besar [Member]
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| Exploratory Wells Drilled [Line Items] |
|
|
|
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| Capitalized exploratory well costs |
18 |
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| Years wells drilled, period |
1992 - 2010 |
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Malaysia [Member] | Other 2 Projects In Malaysia [Member]
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| Exploratory Wells Drilled [Line Items] |
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| Capitalized exploratory well costs |
8 |
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| Years wells drilled, period |
1979 - 1995 |
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Nigeria [Member] | Project In Nigeria - Bolia [Member]
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| Exploratory Wells Drilled [Line Items] |
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| Capitalized exploratory well costs |
15 |
|
|
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| Years wells drilled, period |
2002 - 2006 |
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Nigeria [Member] | Project In Nigeria - Bosi [Member]
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| Exploratory Wells Drilled [Line Items] |
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| Capitalized exploratory well costs |
79 |
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| Years wells drilled, period |
2002 - 2006 |
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Nigeria [Member] | Project In Nigeria - Pegi [Member]
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| Exploratory Wells Drilled [Line Items] |
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| Capitalized exploratory well costs |
32 |
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| Years wells drilled, period |
2009 |
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Nigeria [Member] | Other 4 Projects In Nigeria [Member]
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| Exploratory Wells Drilled [Line Items] |
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| Capitalized exploratory well costs |
13 |
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| Years wells drilled, period |
2002 |
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Norway [Member] | Project In Norway - Gamma [Member]
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| Exploratory Wells Drilled [Line Items] |
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| Capitalized exploratory well costs |
20 |
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| Years wells drilled, period |
2008 - 2009 |
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Norway [Member] | Project In Norway - H-North [Member]
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| Exploratory Wells Drilled [Line Items] |
|
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| Capitalized exploratory well costs |
15 |
|
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| Years wells drilled, period |
2007 |
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Norway [Member] | Project In Norway - Lavrans [Member]
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| Exploratory Wells Drilled [Line Items] |
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| Capitalized exploratory well costs |
22 |
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| Years wells drilled, period |
1995 - 1999 |
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Norway [Member] | Project In Norway - Nyk High [Member]
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| Exploratory Wells Drilled [Line Items] |
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| Capitalized exploratory well costs |
19 |
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| Years wells drilled, period |
2008 |
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Norway [Member] | Other 6 Projects In Norway [Member]
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| Exploratory Wells Drilled [Line Items] |
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| Capitalized exploratory well costs |
26 |
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| Years wells drilled, period |
1992 - 2010 |
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Papua New Guinea [Member] | Project In Papua New Guinea - Juha [Member]
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| Exploratory Wells Drilled [Line Items] |
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| Capitalized exploratory well costs |
28 |
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| Years wells drilled, period |
2007 |
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United Kingdom [Member] | Project In United Kingdom - Fram [Member]
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| Exploratory Wells Drilled [Line Items] |
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| Capitalized exploratory well costs |
55 |
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| Years wells drilled, period |
2009 |
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United Kingdom [Member] | Other 2 Projects In United Kingdom [Member]
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| Exploratory Wells Drilled [Line Items] |
|
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| Capitalized exploratory well costs |
14 |
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| Years wells drilled, period |
2001 - 2004 |
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United States [Member] | Project In United States - Julia Unit [Member]
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| Exploratory Wells Drilled [Line Items] |
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| Capitalized exploratory well costs |
78 |
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| Years wells drilled, period |
2007 - 2008 |
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United States [Member] | Project In United States - Point Thomson [Member]
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| Exploratory Wells Drilled [Line Items] |
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| Capitalized exploratory well costs |
449 |
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| Years wells drilled, period |
1977 - 2010 |
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United States [Member] | Project In United States - Tip Top [Member]
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| Exploratory Wells Drilled [Line Items] |
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| Capitalized exploratory well costs |
$ 31 |
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| Years wells drilled, period |
2009 |
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