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Revenue Recognition - Remaining Performance Obligations Total (Details)
$ in Millions
Sep. 30, 2020
USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Total Remaining Performance Obligations $ 4,365
Nuclear Operations Group  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Total Remaining Performance Obligations 3,610
Nuclear Power Group  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Total Remaining Performance Obligations 726
Nuclear Services Group  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Total Remaining Performance Obligations $ 29