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Long-Lived Assets (Acquisitions) (Details) - USD ($) shares in Millions, $ in Millions	1 Months Ended
	Jun. 30, 2024	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2024
Acquisition
Property and equipment, net		$ 12,688	$ 15,831
Cash and cash equivalents		833	560
Accounts receivable		$ 574	$ 564
8.00% Senior Notes due February 2027
Acquisition
Debt instrument interest rate stated percentage	8.00%	8.00%		8.00%
Orion/Transocean Norge | 8.00% Senior Notes due February 2027
Acquisition
Debt instrument interest rate stated percentage	8.00%
Orion/Transocean Norge
Acquisition
Asset acquisition, consideration transferred	$ 431
Newly issued shares in asset acquisition (in shares)	55.5
Property and equipment, net	$ 517
Cash and cash equivalents	5
Accounts receivable	4
Orion/Transocean Norge | 8.00% Senior Notes due February 2027
Acquisition
Debt instrument face value	$ 130
Debt instrument interest rate stated percentage	8.00%
Orion/Transocean Norge | Orion/Transocean Norge
Acquisition
Equity ownership (as a percent)	67.00%

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