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Revenues (Disaggregation) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Revenue
Contract drilling revenues	$ 1,028	$ 948	$ 2,922	$ 2,572
U.S.
Revenue
Contract drilling revenues	400	395	1,202	1,171
Brazil
Revenue
Contract drilling revenues	223	204	636	509
Norway
Revenue
Contract drilling revenues	177	172	476	486
Other Countries
Revenue
Contract drilling revenues	228	177	608	406
Ultra-deepwater floaters
Revenue
Contract drilling revenues	696	668	2,053	1,843
Ultra-deepwater floaters | U.S.
Revenue
Contract drilling revenues	400	395	1,202	1,171
Ultra-deepwater floaters | Brazil
Revenue
Contract drilling revenues	223	204	636	509
Ultra-deepwater floaters | Other Countries
Revenue
Contract drilling revenues	73	69	215	163
Harsh environment floaters
Revenue
Contract drilling revenues	332	280	869	729
Harsh environment floaters | Norway
Revenue
Contract drilling revenues	177	172	476	486
Harsh environment floaters | Other Countries
Revenue
Contract drilling revenues	$ 155	$ 108	$ 393	$ 243

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