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Revenues (Disaggregation) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue
Performance obligations satisfied in previous periods									$ 10	$ 174
Recognized pre-operating costs									18	45	$ 45
Unrecognized pre-operating costs	$ 34				$ 2				34	2
Contract drilling revenues	$ 792	$ 784	$ 758	$ 754	$ 748	$ 816	$ 790	$ 664	3,088	3,018	2,973
Before adoption of Topic 606
Revenue
Contract drilling revenues											2,973
Ultra-deepwater floaters
Revenue
Contract drilling revenues									1,957	1,788
Ultra-deepwater floaters | Before adoption of Topic 606
Revenue
Contract drilling revenues											2,048
Harsh environment floaters
Revenue
Contract drilling revenues									1,069	974
Harsh environment floaters | Before adoption of Topic 606
Revenue
Contract drilling revenues											456
Deepwater floaters
Revenue
Contract drilling revenues									7	124
Deepwater floaters | Before adoption of Topic 606
Revenue
Contract drilling revenues											144
Midwater floaters
Revenue
Contract drilling revenues									55	74
Midwater floaters | Before adoption of Topic 606
Revenue
Contract drilling revenues											153
High specification jackups
Revenue
Contract drilling revenues										58
High specification jackups | Before adoption of Topic 606
Revenue
Contract drilling revenues											172
U.S.
Revenue
Contract drilling revenues									1,264	1,496	1,527
U.S. | Before adoption of Topic 606
Revenue
Contract drilling revenues											1,527
U.S. | Ultra-deepwater floaters
Revenue
Contract drilling revenues									1,264	1,496
U.S. | Ultra-deepwater floaters | Before adoption of Topic 606
Revenue
Contract drilling revenues											1,519
U.S. | Harsh environment floaters | Before adoption of Topic 606
Revenue
Contract drilling revenues											8
Norway
Revenue
Contract drilling revenues									775	651	83
Norway | Before adoption of Topic 606
Revenue
Contract drilling revenues											83
Norway | Harsh environment floaters
Revenue
Contract drilling revenues									775	651
Norway | Harsh environment floaters | Before adoption of Topic 606
Revenue
Contract drilling revenues											83
Brazil
Revenue
Contract drilling revenues									125	110	335
Brazil | Before adoption of Topic 606
Revenue
Contract drilling revenues											335
Brazil | Ultra-deepwater floaters
Revenue
Contract drilling revenues									119	26
Brazil | Ultra-deepwater floaters | Before adoption of Topic 606
Revenue
Contract drilling revenues											235
Brazil | Deepwater floaters
Revenue
Contract drilling revenues									6	84
Brazil | Deepwater floaters | Before adoption of Topic 606
Revenue
Contract drilling revenues											100
Other
Revenue
Contract drilling revenues									924	761
Other | Before adoption of Topic 606
Revenue
Contract drilling revenues											1,028
Other | Ultra-deepwater floaters
Revenue
Contract drilling revenues									574	266
Other | Ultra-deepwater floaters | Before adoption of Topic 606
Revenue
Contract drilling revenues											294
Other | Harsh environment floaters
Revenue
Contract drilling revenues									294	323
Other | Harsh environment floaters | Before adoption of Topic 606
Revenue
Contract drilling revenues											365
Other | Deepwater floaters
Revenue
Contract drilling revenues									1	40
Other | Deepwater floaters | Before adoption of Topic 606
Revenue
Contract drilling revenues											44
Other | Midwater floaters
Revenue
Contract drilling revenues									$ 55	74
Other | Midwater floaters | Before adoption of Topic 606
Revenue
Contract drilling revenues											153
Other | High specification jackups
Revenue
Contract drilling revenues										$ 58
Other | High specification jackups | Before adoption of Topic 606
Revenue
Contract drilling revenues											$ 172

X

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Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

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