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Acquisitions and Dispositions (Aspire Defence Subcontracting Joint Ventures) (Details) - USD ($)
3 Months Ended 12 Months Ended
Apr. 18, 2018
Sep. 30, 2019
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 15, 2018
Business Acquisition [Line Items]              
Goodwill       $ 1,265,000,000 $ 1,265,000,000 $ 968,000,000  
Acquisition related costs       2,000,000 7,000,000 $ 0  
Aspire              
Business Acquisition [Line Items]              
Gain on consolidation of entities     $ 108,000,000   108,000,000    
Goodwill             $ 42,000,000
Fair value of total consideration transferred $ 50,000,000            
Adjustment to noncontrolling interests 119,000,000            
Net increase to PIC $ 69,000,000            
Acquisition related costs   $ 0     1,000,000    
Revenues contributed by acquiree       535,000,000 533,000,000    
Gross profit contributed by acquiree       $ 71,000,000 $ 61,000,000