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Revenues (Disaggregation) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Revenue
Performance obligations satisfied in previous periods	$ 54		$ 147
Recognized pre-operating costs	14	$ 11	36	$ 35
Unrecognized pre-operating costs	10		10		$ 18
Contract drilling revenues	816	808	2,270	2,344
Before adoption of Topic 606
Revenue
Contract drilling revenues		808		2,344
Ultra-deepwater floaters
Revenue
Contract drilling revenues	483		1,331
Ultra-deepwater floaters | Before adoption of Topic 606
Revenue
Contract drilling revenues		523		1,609
Harsh environment floaters
Revenue
Contract drilling revenues	265		721
Harsh environment floaters | Before adoption of Topic 606
Revenue
Contract drilling revenues		118		348
Deepwater floaters
Revenue
Contract drilling revenues	36		106
Deepwater floaters | Before adoption of Topic 606
Revenue
Contract drilling revenues		35		106
Midwater floaters
Revenue
Contract drilling revenues	19		57
Midwater floaters | Before adoption of Topic 606
Revenue
Contract drilling revenues		104		136
High specification jackups
Revenue
Contract drilling revenues	13		55
High specification jackups | Before adoption of Topic 606
Revenue
Contract drilling revenues		28		145
U.S.
Revenue
Contract drilling revenues	396		1,162
U.S. | Before adoption of Topic 606
Revenue
Contract drilling revenues		376		1,175
U.S. | Ultra-deepwater floaters
Revenue
Contract drilling revenues	396		1,162
U.S. | Ultra-deepwater floaters | Before adoption of Topic 606
Revenue
Contract drilling revenues		368		1,167
U.S. | Harsh environment floaters | Before adoption of Topic 606
Revenue
Contract drilling revenues		8		8
U.K.
Revenue
Contract drilling revenues	47		118
U.K. | Before adoption of Topic 606
Revenue
Contract drilling revenues		70		252
U.K. | Harsh environment floaters
Revenue
Contract drilling revenues	37		88
U.K. | Harsh environment floaters | Before adoption of Topic 606
Revenue
Contract drilling revenues		62		197
U.K. | Midwater floaters
Revenue
Contract drilling revenues	10		30
U.K. | Midwater floaters | Before adoption of Topic 606
Revenue
Contract drilling revenues		8		22
U.K. | High specification jackups | Before adoption of Topic 606
Revenue
Contract drilling revenues				33
Norway
Revenue
Contract drilling revenues	174		467
Norway | Before adoption of Topic 606
Revenue
Contract drilling revenues		15		54
Norway | Harsh environment floaters
Revenue
Contract drilling revenues	174		467
Norway | Harsh environment floaters | Before adoption of Topic 606
Revenue
Contract drilling revenues		15		54
Brazil
Revenue
Contract drilling revenues	26		75
Brazil | Before adoption of Topic 606
Revenue
Contract drilling revenues		63		271
Brazil | Ultra-deepwater floaters
Revenue
Contract drilling revenues	1		1
Brazil | Ultra-deepwater floaters | Before adoption of Topic 606
Revenue
Contract drilling revenues		39		198
Brazil | Deepwater floaters
Revenue
Contract drilling revenues	25		74
Brazil | Deepwater floaters | Before adoption of Topic 606
Revenue
Contract drilling revenues		24		73
Other
Revenue
Contract drilling revenues	173		448
Other | Before adoption of Topic 606
Revenue
Contract drilling revenues		284		592
Other | Ultra-deepwater floaters
Revenue
Contract drilling revenues	86		168
Other | Ultra-deepwater floaters | Before adoption of Topic 606
Revenue
Contract drilling revenues		116		244
Other | Harsh environment floaters
Revenue
Contract drilling revenues	54		166
Other | Harsh environment floaters | Before adoption of Topic 606
Revenue
Contract drilling revenues		33		89
Other | Deepwater floaters
Revenue
Contract drilling revenues	11		32
Other | Deepwater floaters | Before adoption of Topic 606
Revenue
Contract drilling revenues		11		33
Other | Midwater floaters
Revenue
Contract drilling revenues	9		27
Other | Midwater floaters | Before adoption of Topic 606
Revenue
Contract drilling revenues		96		114
Other | High specification jackups
Revenue
Contract drilling revenues	$ 13		$ 55
Other | High specification jackups | Before adoption of Topic 606
Revenue
Contract drilling revenues		$ 28		$ 112

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