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Unapproved change orders and claims (Narrative) (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Unapproved change orders $ 46 $ 31 $ 115
Liquidated damages 6 12  
Parent Share of Probable Unapproved Claims of Unconsolidated Subsidiary [Member]      
Unapproved change orders $ 58 $ 78