Properties, Plant and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Properties, Plant and Equipment
Gross Investment at Cost	$ 326,722
Gross Investment at Cost		$ 340,244	$ 344,485
Net Investment	150,494
Net Investment		169,207	177,712
Additions at Cost	13,555	13,066	14,364
Depreciation Expense	29,218	19,419	19,349
Dry hole expense related to prior years expenditures, net	124	343	42
Accretion expense	628	654	668
Impairment charges	10,797	735	1,021
United States
Properties, Plant and Equipment
Gross Investment at Cost	112,804
Gross Investment at Cost		117,507	112,998
Net Investment	44,716
Net Investment		52,550	51,409
Additions at Cost	9,527	7,917	6,120
Depreciation Expense	16,334	6,399	6,957
International
Properties, Plant and Equipment
Gross Investment at Cost	213,918
Gross Investment at Cost		222,737	231,487
Net Investment	105,778
Net Investment		116,657	126,303
Additions at Cost	4,028	5,149	8,244
Depreciation Expense	12,884	13,020	12,392
Australia
Properties, Plant and Equipment
Net Investment	51,359	53,768	55,514
Upstream
Properties, Plant and Equipment
Gross Investment at Cost	288,409
Gross Investment at Cost		303,484	308,813
Net Investment	133,721
Net Investment		153,129	161,913
Additions at Cost	11,415	11,299	12,929
Depreciation Expense	27,840	18,054	17,623
Upstream \| United States
Properties, Plant and Equipment
Gross Investment at Cost	82,117
Gross Investment at Cost		88,155	84,602
Net Investment	31,082
Net Investment		39,526	38,722
Additions at Cost	7,751	6,434	4,995
Depreciation Expense	15,222	5,328	5,527
Upstream \| International
Properties, Plant and Equipment
Gross Investment at Cost	206,292
Gross Investment at Cost		215,329	224,211
Net Investment	102,639
Net Investment		113,603	123,191
Additions at Cost	3,664	4,865	7,934
Depreciation Expense	12,618	12,726	12,096
Downstream
Properties, Plant and Equipment
Gross Investment at Cost	33,448
Gross Investment at Cost		31,922	30,692
Net Investment	14,512
Net Investment		13,861	13,420
Additions at Cost	1,807	1,537	1,213
Depreciation Expense	1,125	1,033	1,035
Downstream \| United States
Properties, Plant and Equipment
Gross Investment at Cost	25,968
Gross Investment at Cost		24,685	23,598
Net Investment	11,398
Net Investment		10,838	10,346
Additions at Cost	1,452	1,259	907
Depreciation Expense	869	751	753
Downstream \| International
Properties, Plant and Equipment
Gross Investment at Cost	7,480
Gross Investment at Cost		7,237	7,094
Net Investment	3,114
Net Investment		3,023	3,074
Additions at Cost	355	278	306
Depreciation Expense	256	282	282
Segment Reconciling Items
Properties, Plant and Equipment
Gross Investment at Cost	4,865
Gross Investment at Cost		4,838	4,980
Net Investment	2,261
Net Investment		2,217	2,379
Additions at Cost	333	230	222
Depreciation Expense	253	332	691
Segment Reconciling Items \| United States
Properties, Plant and Equipment
Gross Investment at Cost	4,719
Gross Investment at Cost		4,667	4,798
Net Investment	2,236
Net Investment		2,186	2,341
Additions at Cost	324	224	218
Depreciation Expense	243	320	677
Segment Reconciling Items \| International
Properties, Plant and Equipment
Gross Investment at Cost	146
Gross Investment at Cost		171	182
Net Investment	25
Net Investment		31	38
Additions at Cost	9	6	4
Depreciation Expense	$ 10	$ 12	$ 14

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Property, Plant, And Equipment And Finance Lease Right-Of-Use Asset, After Accumulated Depreciation And Amortization

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Property, Plant, And Equipment And Finance Lease Right-Of-Use Asset, Before Accumulated Depreciation And Amortization

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Amount recognized for the passage of time, typically for liabilities, that have been discounted to their net present values. Excludes accretion associated with asset retirement obligations.

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Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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