Newbuildings (Tables)

12 Months Ended

Dec. 31, 2012

Newbuildings [Abstract]

Newbuildings

(In US$ millions)	December 31, 2012		December 31, 2011
Opening balance		2,531		1,247
Additions		1,267		2,308
Capitalized interest and loan related costs		76		73
Re-classified as Drilling Units		(1,992)		(1,097	)
Closing balance		1,882		2,531