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Debt (Issuance) (Details) - USD ($) $ in Millions	1 Months Ended		9 Months Ended
Debt (Issuance) (Details) - USD ($) $ in Millions	Apr. 30, 2024	Jan. 31, 2023	Sep. 30, 2024	Sep. 30, 2023	Jun. 30, 2024	Dec. 31, 2023
Debt
Proceeds from issuance of debt	$ 1,770		$ 1,767	$ 1,664
Orion/Transocean Norge
Debt
Equity ownership (as a percent)						33.00%
Orion/Transocean Norge \| Orion/Transocean Norge
Debt
Equity ownership (as a percent)					67.00%
8.375% Senior Secured Notes due February 2028
Debt
Debt instrument face value		$ 525
Debt instrument interest rate stated percentage			8.375%
Proceeds from issuance of debt		$ 516
Redemption price of debt instrument (as a percent)		100.00%
8.75% Senior Secured Notes due February 2030
Debt
Debt instrument face value		$ 1,175
Debt instrument interest rate stated percentage			8.75%
Proceeds from issuance of debt		$ 1,148
Redemption price of debt instrument (as a percent)		100.00%
8.00% Senior Notes due February 2027
Debt
Debt instrument interest rate stated percentage			8.00%
8.00% Senior Notes due February 2027 \| Orion/Transocean Norge
Debt
Debt instrument face value					$ 130
Debt instrument interest rate stated percentage			8.00%		8.00%
8.25% Senior Notes due May 2029
Debt
Debt instrument face value	$ 900
Debt instrument interest rate stated percentage			8.25%
Redemption price of debt instrument (as a percent)	100.00%
8.50% Senior Notes due May 2031
Debt
Debt instrument face value	$ 900
Debt instrument interest rate stated percentage			8.50%
Redemption price of debt instrument (as a percent)	100.00%