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Unapproved Change Orders, and Claims, Against Clients and Estimated Recoveries of Claims Against Suppliers and Subcontractors (Tables)
6 Months Ended
Jun. 30, 2021
Contractors [Abstract]  
Schedule of unapproved claims and change orders
The amounts of unapproved change orders, and claims against clients and estimated recoveries of claims against suppliers and subcontractors included in determining the profit or loss on contracts are as follows:
Dollars in millionsJune 30, 2021June 30, 2020
Amounts included in project estimates-at-completion at January 1,$1,048 $978 
(Decrease) increase in project estimates(228)(1)
Approved change orders(11)(6)
Foreign currency impact(1)(16)
Amounts included in project estimates-at-completion at June 30,$808 $955 
Amounts recognized over time based on progress at June 30,$808 $955