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Acquisitions (Narrative) (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Business Acquisition [Line Items]      
Payments to Acquire Businesses, Net of Cash Acquired $ 378 $ 196  
Goodwill arising from acquisitions 310    
Goodwill, Purchase Accounting Adjustments (107)    
Hydroid, Inc. [Member]      
Business Acquisition [Line Items]      
Payments to Acquire Businesses, Net of Cash Acquired 378    
Cash acquired 2    
Goodwill arising from acquisitions 310    
Goodwill, Purchase Accounting Adjustments (72)    
Intangible Assets $ 76    
Fulcrum IT Services, LLC      
Business Acquisition [Line Items]      
Payments to Acquire Businesses, Net of Cash Acquired     $ 195
Cash acquired     1
Goodwill arising from acquisitions     133
Goodwill, Purchase Accounting Adjustments     (1)
Intangible Assets     $ 49