v3.19.3.a.u2
Accounting For Suspended Exploratory Well Costs (Schedule Of Additional Detail For The Projects) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 4,613 $ 4,160 $ 3,700 $ 4,477
32 Projects [Member]        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs 3,176      
Angola [Member] | Project in Angola - AB32 Central NE Hub [Member]        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 69      
Angola [Member] | Project in Angola - AB32 Central NE Hub [Member] | Minimum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2006      
Angola [Member] | Project in Angola - AB32 Central NE Hub [Member] | Maximum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2014      
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      
Argentina [Member] | Project in Argentina - La Invernada [Member]        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 72      
Argentina [Member] | Project in Argentina - La Invernada [Member] | Minimum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2014      
Argentina [Member] | Project in Argentina - La Invernada [Member] | Maximum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2014      
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 - Gorgon Area Ullage [Member]        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 315      
Australia [Member] | Project in Australia - Gorgon Area Ullage [Member] | Minimum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 1994      
Australia [Member] | Project in Australia - Gorgon Area Ullage [Member] | Maximum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2015      
Australia [Member] | Project in Australia - SE Longtom [Member]        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 10      
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 $ 32      
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      
Guyana [Member] | Project in Guyana - Payara [Member]        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 120      
Guyana [Member] | Project in Guyana - Payara [Member] | Minimum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2017      
Guyana [Member] | Project in Guyana - Payara [Member] | Maximum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2018      
Iraq [Member] | Project in Iraq - Kurdistan Pirmam [Member]        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 109      
Iraq [Member] | Project in Iraq - Kurdistan Pirmam [Member] | Minimum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2015      
Iraq [Member] | Project in Iraq - Kurdistan Pirmam [Member] | Maximum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2015      
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      
Mozambique [Member] | Project in Mozambique - Rovuma LNG Future Non-Straddling Train [Member]        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 120      
Mozambique [Member] | Project in Mozambique - Rovuma LNG Future Non-Straddling Train [Member] | Minimum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2017      
Mozambique [Member] | Project in Mozambique - Rovuma LNG Future Non-Straddling Train [Member] | Maximum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2017      
Mozambique [Member] | Project in Mozambique - Rovuma LNG Phase 1 [Member]        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 150      
Mozambique [Member] | Project in Mozambique - Rovuma LNG Phase 1 [Member] | Minimum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2017      
Mozambique [Member] | Project in Mozambique - Rovuma LNG Phase 1 [Member] | Maximum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2017      
Mozambique [Member] | Project in Mozambique - Rovuma LNG Unitized Trains [Member]        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 35      
Mozambique [Member] | Project in Mozambique - Rovuma LNG Unitized Trains [Member] | Minimum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2017      
Mozambique [Member] | Project in Mozambique - Rovuma LNG Unitized Trains [Member] | Maximum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2017      
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 - Bonga North [Member]        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 34      
Nigeria [Member] | Project in Nigeria - Bonga North [Member] | Minimum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2004      
Nigeria [Member] | Project in Nigeria - Bonga North [Member] | Maximum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2009      
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 - OML 138 Ukot SS [Member]        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 13      
Nigeria [Member] | Project in Nigeria - OML 138 Ukot SS [Member] | Minimum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2015      
Nigeria [Member] | Project in Nigeria - OML 138 Ukot SS [Member] | Maximum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2015      
Nigeria [Member] | Project in Nigeria - OML 138 Ukot SW [Member]        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 41      
Nigeria [Member] | Project in Nigeria - OML 138 Ukot SW [Member] | Minimum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2014      
Nigeria [Member] | Project in Nigeria - OML 138 Ukot SW [Member] | Maximum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2014      
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 $ 10      
Nigeria [Member] | Other 4 Projects in Nigeria [Member] | Minimum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2001      
Nigeria [Member] | Other 4 Projects in Nigeria [Member] | Maximum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2002      
Papua New Guinea [Member] | Project in Papua New Guinea - Papua LNG [Member]        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 246      
Papua New Guinea [Member] | Project in Papua New Guinea - Papua LNG [Member] | Minimum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2017      
Papua New Guinea [Member] | Project in Papua New Guinea - Papua LNG [Member] | Maximum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2017      
Papua New Guinea [Member] | Project in Papua New Guinea - P'nyang [Member]        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 115      
Papua New Guinea [Member] | Project in Papua New Guinea - P'nyang [Member] | Minimum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2012      
Papua New Guinea [Member] | Project in Papua New Guinea - P'nyang [Member] | Maximum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2018      
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      
Romania [Member] | Project in Romania - Neptun Deep [Member]        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 536      
Romania [Member] | Project in Romania - Neptun Deep [Member] | Minimum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2012      
Romania [Member] | Project in Romania - Neptun Deep [Member] | Maximum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2016      
Tanzania [Member] | Project in Tanzania - Tanzania Block 2 [Member]        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 537      
Tanzania [Member] | Project in Tanzania - Tanzania Block 2 [Member] | Minimum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2012      
Tanzania [Member] | Project in Tanzania - Tanzania Block 2 [Member] | Maximum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2018      
Vietnam [Member] | Project in Vietnam - Blue Whale [Member]        
Exploratory Wells Drilled [Line Items]        
Capitalized exploratory well costs $ 296      
Vietnam [Member] | Project in Vietnam - Blue Whale [Member] | Minimum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2011      
Vietnam [Member] | Project in Vietnam - Blue Whale [Member] | Maximum [Member]        
Exploratory Wells Drilled [Line Items]        
Years wells drilled, period 2015