Related party transactions (Tables)

12 Months Ended

Dec. 31, 2012

Related party transactions [Abstract]

Lease costs on units leased back from related parties

In the 12 months ended December 31, 2012, the Company incurred the following lease costs on units leased back from Ship Finance subsidiaries.

(US$ millions)	2012		2011
West Prospero	-			7
West Polaris		114		126
West Hercules		75		120
West Taurus		114		112
Total		303		365