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Properties, Plant and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Properties, Plant and Equipment
Gross Investment at Cost	$ 340,244	$ 344,485	$ 336,077
Net Investment	169,207	177,712	182,186
Additions at Cost	13,066	14,364	17,623
Depreciation Expense	19,419	19,349	19,457
Dry hole expense related to prior years expenditures, net	343	42	175
Accretion expense	654	668	749
Impairment charges	735	1,021	3,186
United States
Properties, Plant and Equipment
Gross Investment at Cost	117,507	112,998	111,987
Net Investment	52,550	51,409	52,541
Additions at Cost	7,917	6,120	5,158
Depreciation Expense	6,399	6,957	7,860
International
Properties, Plant and Equipment
Gross Investment at Cost	222,737	231,487	224,090
Net Investment	116,657	126,303	129,645
Additions at Cost	5,149	8,244	12,465
Depreciation Expense	13,020	12,392	11,597
Australia
Properties, Plant and Equipment
Net Investment	53,768	55,514	53,962
Upstream
Properties, Plant and Equipment
Gross Investment at Cost	303,484	308,813	298,486
Net Investment	153,129	161,913	165,212
Additions at Cost	11,299	12,929	16,516
Depreciation Expense	18,054	17,623	17,823
Upstream | United States
Properties, Plant and Equipment
Gross Investment at Cost	88,155	84,602	83,929
Net Investment	39,526	38,722	39,710
Additions at Cost	6,434	4,995	4,432
Depreciation Expense	5,328	5,527	6,576
Upstream | International
Properties, Plant and Equipment
Gross Investment at Cost	215,329	224,211	214,557
Net Investment	113,603	123,191	125,502
Additions at Cost	4,865	7,934	12,084
Depreciation Expense	12,726	12,096	11,247
Downstream
Properties, Plant and Equipment
Gross Investment at Cost	31,922	30,692	32,145
Net Investment	13,861	13,420	14,290
Additions at Cost	1,537	1,213	903
Depreciation Expense	1,033	1,035	1,288
Downstream | United States
Properties, Plant and Equipment
Gross Investment at Cost	24,685	23,598	22,795
Net Investment	10,838	10,346	10,196
Additions at Cost	1,259	907	528
Depreciation Expense	751	753	956
Downstream | International
Properties, Plant and Equipment
Gross Investment at Cost	7,237	7,094	9,350
Net Investment	3,023	3,074	4,094
Additions at Cost	278	306	375
Depreciation Expense	282	282	332
All Other
Properties, Plant and Equipment
Gross Investment at Cost	4,838	4,980	5,446
Net Investment	2,217	2,379	2,684
Additions at Cost	230	222	204
Depreciation Expense	332	691	346
All Other | United States
Properties, Plant and Equipment
Gross Investment at Cost	4,667	4,798	5,263
Net Investment	2,186	2,341	2,635
Additions at Cost	224	218	198
Depreciation Expense	320	677	328
All Other | International
Properties, Plant and Equipment
Gross Investment at Cost	171	182	183
Net Investment	31	38	49
Additions at Cost	6	4	6
Depreciation Expense	$ 12	$ 14	$ 18

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