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Business Combinations (Proforma) (Details) - Songa - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Pro forma information
Revenue since acquisition	$ 137		$ 356
Net income since acquisition	16		36
Contract drilling revenues	816	$ 954	2,319	$ 2,749
Net loss	$ (409)	$ (1,417)	$ (1,753)	$ (2,977)
Per share loss - basic and diluted (in dollars per share)	$ (0.88)	$ (3.11)	$ (3.79)	$ (6.55)

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The pro forma basic and diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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-Publisher FASB
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