v3.3.1.900
Accounting For Suspended Exploratory Well Costs (Schedule Of Additional Detail For The Projects) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 4,372 $ 3,587 $ 2,707 $ 2,679
Total 37 Projects [Member]        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs 1,154      
Angola [Member] | Project In Angola - Kaombo Split Hub Phase 2[Member]        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 20      
Angola [Member] | Project In Angola - Kaombo Split Hub Phase 2[Member] | Minimum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2005      
Angola [Member] | Project In Angola - Kaombo Split Hub Phase 2[Member] | Maximum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2006      
Angola [Member] | Project In Angola - Perpetua-Zinia- Acacia [Member]        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 15      
Angola [Member] | Project In Angola - Perpetua-Zinia- Acacia [Member] | Minimum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2008      
Angola [Member] | Project In Angola - Perpetua-Zinia- Acacia [Member] | Maximum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2009      
Australia [Member] | Project In Australia - East Pilchard [Member]        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 7      
Australia [Member] | Project In Australia - East Pilchard [Member] | Minimum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2001      
Australia [Member] | Project In Australia - East Pilchard [Member] | Maximum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2001      
Australia [Member] | Project In Australia - SE Longtom [Member]        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 11      
Australia [Member] | Project In Australia - SE Longtom [Member] | Minimum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2010      
Australia [Member] | Project In Australia - SE Longtom [Member] | Maximum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2010      
Australia [Member] | Project in Australia - SE Remora [Member]        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 34      
Australia [Member] | Project in Australia - SE Remora [Member] | Minimum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2010      
Australia [Member] | Project in Australia - SE Remora [Member] | Maximum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2010      
Canada [Member] | Project in Canada - Horn River        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 241      
Canada [Member] | Project in Canada - Horn River | Minimum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2009      
Canada [Member] | Project in Canada - Horn River | Maximum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2012      
Indonesia [Member] | Project In Indonesia - Alas Tua West [Member]        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 16      
Indonesia [Member] | Project In Indonesia - Alas Tua West [Member] | Minimum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2010      
Indonesia [Member] | Project In Indonesia - Alas Tua West [Member] | Maximum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2010      
Indonesia [Member] | Project In Indonesia - Cepu Gas [Member]        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 29      
Indonesia [Member] | Project In Indonesia - Cepu Gas [Member] | Minimum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2008      
Indonesia [Member] | Project In Indonesia - Cepu Gas [Member] | Maximum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2011      
Indonesia [Member] | Project in Indonesia - Kedung Keris [Member]        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 11      
Indonesia [Member] | Project in Indonesia - Kedung Keris [Member] | Minimum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2011      
Indonesia [Member] | Project in Indonesia - Kedung Keris [Member] | Maximum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2011      
Indonesia [Member] | Project In Indonesia - Natuna [Member]        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 118      
Indonesia [Member] | Project In Indonesia - Natuna [Member] | Minimum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 1981      
Indonesia [Member] | Project In Indonesia - Natuna [Member] | Maximum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 1983      
Kazakhstan [Member] | Project In Kazakhstan - Kairan [Member]        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 53      
Kazakhstan [Member] | Project In Kazakhstan - Kairan [Member] | Minimum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2004      
Kazakhstan [Member] | Project In Kazakhstan - Kairan [Member] | Maximum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2007      
Kazakhstan [Member] | Project in Kazakhstan - Kalamkas        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 18      
Kazakhstan [Member] | Project in Kazakhstan - Kalamkas | Minimum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2006      
Kazakhstan [Member] | Project in Kazakhstan - Kalamkas | Maximum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2009      
Malaysia [Member] | Project in Malaysia - Bindu [Member]        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 2      
Malaysia [Member] | Project in Malaysia - Bindu [Member] | Minimum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 1995      
Malaysia [Member] | Project in Malaysia - Bindu [Member] | Maximum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 1995      
Nigeria [Member] | Project In Nigeria - Bolia [Member]        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 15      
Nigeria [Member] | Project In Nigeria - Bolia [Member] | Minimum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2002      
Nigeria [Member] | Project In Nigeria - Bolia [Member] | Maximum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2006      
Nigeria [Member] | Project In Nigeria - Bosi [Member]        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 79      
Nigeria [Member] | Project In Nigeria - Bosi [Member] | Minimum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2002      
Nigeria [Member] | Project In Nigeria - Bosi [Member] | Maximum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2006      
Nigeria [Member] | Project in Nigeria - Bosi Central [Member]        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 16      
Nigeria [Member] | Project in Nigeria - Bosi Central [Member] | Minimum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2006      
Nigeria [Member] | Project in Nigeria - Bosi Central [Member] | Maximum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2006      
Nigeria [Member] | Project in Nigeria - Erha Northeast [Member}        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 26      
Nigeria [Member] | Project in Nigeria - Erha Northeast [Member} | Minimum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2008      
Nigeria [Member] | Project in Nigeria - Erha Northeast [Member} | Maximum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2008      
Nigeria [Member] | Project In Nigeria - Pegi [Member]        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 32      
Nigeria [Member] | Project In Nigeria - Pegi [Member] | Minimum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2009      
Nigeria [Member] | Project In Nigeria - Pegi [Member] | Maximum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2009      
Nigeria [Member] | Project in Nigeria - Satellite Field Development Phase 2 [Member]        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 12      
Nigeria [Member] | Project in Nigeria - Satellite Field Development Phase 2 [Member] | Minimum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2013      
Nigeria [Member] | Project in Nigeria - Satellite Field Development Phase 2 [Member] | Maximum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2013      
Nigeria [Member] | Other 4 Projects In Nigeria [Member]        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 14      
Nigeria [Member] | Other 4 Projects In Nigeria [Member] | Minimum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2002      
Nigeria [Member] | Other 4 Projects In Nigeria [Member] | Maximum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2002      
Norway [Member] | Project in Norway - Gamma [Member]        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 13      
Norway [Member] | Project in Norway - Gamma [Member] | Minimum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2008      
Norway [Member] | Project in Norway - Gamma [Member] | Maximum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2009      
Norway [Member] | Project In Norway - Lavrans [Member]        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 15      
Norway [Member] | Project In Norway - Lavrans [Member] | Minimum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 1995      
Norway [Member] | Project In Norway - Lavrans [Member] | Maximum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 1999      
Norway [Member] | Other 7 Projects In Norway [Member]        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 25      
Norway [Member] | Other 7 Projects In Norway [Member] | Minimum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2008      
Norway [Member] | Other 7 Projects In Norway [Member] | Maximum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2014      
Papua New Guinea [Member] | Project In Papua New Guinea - Juha [Member]        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 28      
Papua New Guinea [Member] | Project In Papua New Guinea - Juha [Member] | Minimum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2007      
Papua New Guinea [Member] | Project In Papua New Guinea - Juha [Member] | Maximum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2007      
Republic of Congo [Member] | Project In Republic of Congo - Mer Tres Profonde Sud [Member]        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 56      
Republic of Congo [Member] | Project In Republic of Congo - Mer Tres Profonde Sud [Member] | Minimum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2000      
Republic of Congo [Member] | Project In Republic of Congo - Mer Tres Profonde Sud [Member] | Maximum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2007      
United Kingdom [Member] | Project In United Kingdom - Phyllis [Member]        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 8      
United Kingdom [Member] | Project In United Kingdom - Phyllis [Member] | Minimum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2004      
United Kingdom [Member] | Project In United Kingdom - Phyllis [Member] | Maximum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2004      
United States [Member] | Project In United States - Hadrian North [Member]        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 209      
United States [Member] | Project In United States - Hadrian North [Member] | Minimum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2010      
United States [Member] | Project In United States - Hadrian North [Member] | Maximum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2013      
United States [Member] | Project in United States - Tip Top [Member]        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 31      
United States [Member] | Project in United States - Tip Top [Member] | Minimum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2009      
United States [Member] | Project in United States - Tip Top [Member] | Maximum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2009