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Newbuildings (Details) (Newbuildings [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Newbuildings [Member]
Movement in Newbuildings [Roll Forward]
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

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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