Segment Disclosures and Related Information - Other Segment Disclosure (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Segment Reporting [Line Items]
Equity investments	$ 9,242	$ 8,737	$ 9,242	$ 8,737
Total assets	126,073	122,472	126,073	122,472	$ 121,939
Capital expenditures and investments	3,133	2,866	9,105	9,530
Corporate
Segment Reporting [Line Items]
Equity investments	1,745	1,624	1,745	1,624
Total assets	14,215	10,091	14,215	10,091
Capital expenditures and investments	31	27	100	84
Segment Totals \| Operating Segments
Segment Reporting [Line Items]
Equity investments	7,497	7,113	7,497	7,113
Total assets	111,858	112,381	111,858	112,381
Capital expenditures and investments	3,102	2,839	9,005	9,446
Alaska \| Operating Segments
Segment Reporting [Line Items]
Equity investments	3	3	3	3
Total assets	22,188	19,736	22,188	19,736
Capital expenditures and investments	936	753	2,797	2,785
Lower 48 \| Operating Segments
Segment Reporting [Line Items]
Equity investments	1	127	1	127
Total assets	60,187	64,387	60,187	64,387
Capital expenditures and investments	1,699	1,571	4,844	5,089
Canada \| Operating Segments
Segment Reporting [Line Items]
Equity investments	0	0	0	0
Total assets	9,633	9,801	9,633	9,801
Capital expenditures and investments	155	152	365	461
EMENA \| Operating Segments
Segment Reporting [Line Items]
Equity investments	2,563	2,163	2,563	2,163
Total assets	11,453	10,405	11,453	10,405
Capital expenditures and investments	215	293	729	923
AP \| Operating Segments
Segment Reporting [Line Items]
Equity investments	4,930	4,820	4,930	4,820
Total assets	8,397	8,052	8,397	8,052
Capital expenditures and investments	$ 97	$ 70	$ 270	$ 188