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Variable Interest Entities (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2013
drillingunit
note
Dec. 31, 2012
Carrying amounts associated with consolidated variable interest entities    
Assets $ 1,271 $ 1,231
Liabilities 282 311
Net carrying amount 989 920
Unconsolidated Variable interest entities    
Number of notes receivable from sale of Midwater Floaters 2  
Number of Midwater Floaters sold (in drilling units) 2  
Stated interest rate on notes receivable received from sale of Midwater Floaters (as a percent) 9.00%  
Aggregate carrying amounts of notes receivable in connection with sale of Midwater Floaters 95 105
Aggregate exposure to loss on receivable instruments in connection with sale of Midwater Floaters $ 95