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Acquisitions (Centauri Platform Holdings) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Oct. 01, 2020
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Business Acquisition [Line Items]            
Goodwill   $ 1,763   $ 1,763   $ 1,761
Acquisition related costs   3 $ 0 4 $ 0  
Centauri LLC            
Business Acquisition [Line Items]            
Purchase price of acquisition $ 830          
Goodwill 576          
Intangible assets $ 226          
Weighted average useful life 13 years          
Acquisition related costs   1   2    
Revenues   181   313    
Gross profit   $ 20   $ 37