Segment Disclosures and Related Information - Other Segment Disclosure (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Segment Reporting [Line Items]
Equity investments	$ 8,980	$ 8,998	$ 8,980	$ 8,998
Total assets	124,261	122,599	124,261	122,599	$ 121,939
Capital expenditures and investments	3,024	3,286	5,972	6,664
Corporate
Segment Reporting [Line Items]
Equity investments	1,696	1,612	1,696	1,612
Total assets	11,894	9,466	11,894	9,466
Capital expenditures and investments	40	32	69	57
Segment Totals \| Operating Segments
Segment Reporting [Line Items]
Equity investments	7,284	7,386	7,284	7,386
Total assets	112,367	113,133	112,367	113,133
Capital expenditures and investments	2,984	3,254	5,903	6,607
Alaska \| Operating Segments
Segment Reporting [Line Items]
Equity investments	3	4	3	4
Total assets	21,617	19,374	21,617	19,374
Capital expenditures and investments	912	986	1,861	2,032
Lower 48 \| Operating Segments
Segment Reporting [Line Items]
Equity investments	1	126	1	126
Total assets	61,966	65,087	61,966	65,087
Capital expenditures and investments	1,640	1,704	3,145	3,518
Canada \| Operating Segments
Segment Reporting [Line Items]
Equity investments	0	0	0	0
Total assets	9,757	10,029	9,757	10,029
Capital expenditures and investments	89	144	210	309
EMENA \| Operating Segments
Segment Reporting [Line Items]
Equity investments	2,471	2,084	2,471	2,084
Total assets	10,797	10,128	10,797	10,128
Capital expenditures and investments	252	356	514	630
AP \| Operating Segments
Segment Reporting [Line Items]
Equity investments	4,809	5,172	4,809	5,172
Total assets	8,230	8,515	8,230	8,515
Capital expenditures and investments	$ 91	$ 64	$ 173	$ 118