Leases (Lease Cost) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating Lease [Member]
Schedule of Operating and Finance Lease Cost [Line Items]
Operating lease cost	$ 1,976	$ 1,776	$ 1,542
Short-term and other (net of sublease rental income)	1,563	1,389	1,351
Total	3,539	3,165	2,893
Finance Lease [Member]
Schedule of Operating and Finance Lease Cost [Line Items]
Amortization of right of use assets	107	243	133
Interest on lease liabilities	140	210	158
Total	247	453	291
Drilling Rigs and Related Equipment [Member]
Schedule of Operating and Finance Lease Cost [Line Items]
Total	$ 999	$ 908	$ 681