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Gain on sale of assets (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Significant Acquisitions and Disposals [Line Items]
Gain/loss	$ 0	$ 22	$ 26
West Juno [Member]
Significant Acquisitions and Disposals [Line Items]
Net proceeds		248
Book value on disposal		226
Gain/loss		22
West Larissa [Member]
Significant Acquisitions and Disposals [Line Items]
Net proceeds			55
Book value on disposal			29
Gain/loss			26
Total [Member]
Significant Acquisitions and Disposals [Line Items]
Net proceeds	0	248	55
Book value on disposal	0	226	29
Gain/loss	$ 0	$ 22	$ 26

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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