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Operating Segments and Geographic Data - Segment Assets (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Segment Assets
Assets	$ 241,645	$ 239,790
Goodwill	4,402	4,402
United States
Segment Assets
Assets	70,274	69,938
International
Segment Assets
Assets	166,969	165,450
Operating Segments
Segment Assets
Assets	231,397	230,895
Operating Segments | Upstream
Segment Assets
Assets	189,915	191,309
Goodwill	4,402	4,402
Operating Segments | Upstream | United States
Segment Assets
Assets	42,093	42,431
Operating Segments | Upstream | International
Segment Assets
Assets	143,420	144,476
Operating Segments | Downstream
Segment Assets
Assets	41,482	39,586
Operating Segments | Downstream | United States
Segment Assets
Assets	24,464	23,490
Operating Segments | Downstream | International
Segment Assets
Assets	17,018	16,096
All Other
Segment Assets
Assets	10,248	8,895
All Other | United States
Segment Assets
Assets	3,717	4,017
All Other | International
Segment Assets
Assets	$ 6,531	$ 4,878

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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