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Properties, Plant and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Properties, Plant and Equipment
Gross Investment at Cost	$ 345,232	$ 326,722
Gross Investment at Cost			$ 340,244
Net Investment	156,618	150,494
Net Investment			169,207
Additions at Cost	25,546	13,555	13,066
Depreciation Expense	19,508	29,218	19,419
Dry hole expense related to prior years expenditures, net	709	49	343
Accretion expense	560	628	654
Impairment charges	2,792	10,797	735
Noble
Properties, Plant and Equipment
Gross Investment at Cost	16,703
Net Investment	16,703
Additions at Cost	16,703
United States
Properties, Plant and Equipment
Gross Investment at Cost	127,249	112,804
Gross Investment at Cost			117,507
Net Investment	51,192	44,716
Net Investment			52,550
Additions at Cost	13,899	9,527	7,917
Depreciation Expense	8,095	16,334	6,399
International
Properties, Plant and Equipment
Gross Investment at Cost	217,983	213,918
Gross Investment at Cost			222,737
Net Investment	105,426	105,778
Net Investment			116,657
Additions at Cost	11,647	4,028	5,149
Depreciation Expense	11,413	12,884	13,020
Australia
Properties, Plant and Equipment
Net Investment	48,060	51,359
Net Investment			53,768
Operating Segments | Upstream
Properties, Plant and Equipment
Gross Investment at Cost	306,401	288,409
Gross Investment at Cost			303,484
Net Investment	140,185	133,721
Net Investment			153,129
Additions at Cost	24,136	11,415	11,299
Depreciation Expense	17,962	27,840	18,054
Operating Segments | Upstream | United States
Properties, Plant and Equipment
Gross Investment at Cost	96,555	82,117
Gross Investment at Cost			88,155
Net Investment	38,175	31,082
Net Investment			39,526
Additions at Cost	13,067	7,751	6,434
Depreciation Expense	6,841	15,222	5,328
Operating Segments | Upstream | International
Properties, Plant and Equipment
Gross Investment at Cost	209,846	206,292
Gross Investment at Cost			215,329
Net Investment	102,010	102,639
Net Investment			113,603
Additions at Cost	11,069	3,664	4,865
Depreciation Expense	11,121	12,618	12,726
Operating Segments | Downstream
Properties, Plant and Equipment
Gross Investment at Cost	34,492	33,448
Gross Investment at Cost			31,922
Net Investment	14,496	14,512
Net Investment			13,861
Additions at Cost	1,211	1,807	1,537
Depreciation Expense	1,134	1,125	1,033
Operating Segments | Downstream | United States
Properties, Plant and Equipment
Gross Investment at Cost	26,499	25,968
Gross Investment at Cost			24,685
Net Investment	11,101	11,398
Net Investment			10,838
Additions at Cost	638	1,452	1,259
Depreciation Expense	851	869	751
Operating Segments | Downstream | International
Properties, Plant and Equipment
Gross Investment at Cost	7,993	7,480
Gross Investment at Cost			7,237
Net Investment	3,395	3,114
Net Investment			3,023
Additions at Cost	573	355	278
Depreciation Expense	283	256	282
Segment Reconciling Items
Properties, Plant and Equipment
Gross Investment at Cost	4,339	4,865
Gross Investment at Cost			4,838
Net Investment	1,937	2,261
Net Investment			2,217
Additions at Cost	199	333	230
Depreciation Expense	412	253	332
Segment Reconciling Items | United States
Properties, Plant and Equipment
Gross Investment at Cost	4,195	4,719
Gross Investment at Cost			4,667
Net Investment	1,916	2,236
Net Investment			2,186
Additions at Cost	194	324	224
Depreciation Expense	403	243	320
Segment Reconciling Items | International
Properties, Plant and Equipment
Gross Investment at Cost	144	146
Gross Investment at Cost			171
Net Investment	21	25
Net Investment			31
Additions at Cost	5	9	6
Depreciation Expense	$ 9	$ 10	$ 12

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