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Revenue (Revenue by Major Customers) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Revenue, Major Customer [Line Items]      
Customer Revenue $ 840 $ 754 $ 504
Customer A | Revenue | Customer      
Revenue, Major Customer [Line Items]      
Customer Revenue $ 563 $ 227 $ 235
Percentage of Total 67.00% 31.00% 47.00%
Customer B | Revenue | Customer      
Revenue, Major Customer [Line Items]      
Customer Revenue $ 84 $ 84 $ 80
Percentage of Total 10.00% 11.00% 16.00%
Customer C | Revenue | Customer      
Revenue, Major Customer [Line Items]      
Customer Revenue   $ 278  
Percentage of Total   37.00%