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Long-Lived Assets (Acquisitions) (Details) - USD ($) $ in Millions	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Acquisition
Property and equipment, net	$ 15,988		$ 16,941
Cash and cash equivalents	435		762
Accounts receivable	594		512
Accounts payable	$ 255		$ 323
Orion/Transocean Norge
Acquisition
Property and equipment, net		$ 517
Cash and cash equivalents		5
Accounts receivable		$ 4
Liquila/Deepwater Aquila
Acquisition
Property and equipment, net				$ 126
Cash and cash equivalents				7
Accounts payable				$ 19