Leases (Right of Use) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Operating Leases
Operating lease right of use asset	$ 7,123	$ 6,849
Operating lease liability - current included in Accounts payable and accrued liabilities	1,852	1,617
Operating lease liability - noncurrent included in Other long-term obligations	4,626	4,393
Total operating lease liability	$ 6,478	$ 6,010
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other assets, including intangibles – net	Other assets, including intangibles – net
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Accounts payable and accrued liabilities	Accounts payable and accrued liabilities
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other long-term obligations	Other long-term obligations
Operating lease weighted average remaining lease term - years	7 years	8 years
Operating lease weighted average discount rate - percent	4.90%	3.90%
Leases, Finance [Abstract]
Finance lease right of use asset	$ 2,888	$ 2,712
Total finance lease liability	$ 2,361	$ 2,042
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Property, plant and equipment, at cost, less accumulated depreciation and depletion	Property, plant and equipment, at cost, less accumulated depreciation and depletion
Finance lease weighted average remaining lease term - years	18 years	26 years
Finance lease weighted average discount rate - percent	6.40%	7.20%
Accounts Payable And Accrued Liabilities [Member]
Leases, Finance [Abstract]
Finance lease liability - current	$ 6	$ 5
Notes And Loans Payable [Member]
Leases, Finance [Abstract]
Finance lease liability - current	117	95
Long-Term Debt [Member]
Leases, Finance [Abstract]
Finance lease liability - noncurrent	2,123	1,821
Long-Term Obligations To Equity Companies [Member]
Leases, Finance [Abstract]
Finance lease liability - noncurrent	115	121
Drilling Rigs and Related Equipment [Member]
Operating Leases
Total operating lease liability	$ 2,198	$ 2,032