Operating Segments and Geographic Data - Segment Assets (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Segment Assets
Assets	$ 249,048	$ 239,535
Goodwill	4,374	4,385
United States
Segment Assets
Assets	79,829	73,992
International
Segment Assets
Assets	164,845	161,158
Operating Segments
Segment Assets
Assets	234,090	229,636
Operating Segments | Upstream
Segment Assets
Assets	184,679	184,412
Goodwill	4,374	4,385
Operating Segments | Upstream | United States
Segment Assets
Assets	41,854	41,870
Operating Segments | Upstream | International
Segment Assets
Assets	138,451	138,157
Operating Segments | Downstream
Segment Assets
Assets	49,411	45,224
Operating Segments | Downstream | United States
Segment Assets
Assets	28,216	26,376
Operating Segments | Downstream | International
Segment Assets
Assets	21,195	18,848
All Other
Segment Assets
Assets	14,958	9,899
All Other | United States
Segment Assets
Assets	9,759	5,746
All Other | International
Segment Assets
Assets	$ 5,199	$ 4,153