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Related Party Transactions (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Related Party Transaction [Line Items]      
Related party note receivable $ 0 $ 115  
7.5% Term Loan due November 30, 2023 | Notes Payable, Other Payables      
Related Party Transaction [Line Items]      
Debt forgiven   300  
Affiliated Entity | Leonardo S.p.A.      
Related Party Transaction [Line Items]      
Revenue from related parties 11 26 $ 16
Receivables 2 5  
Payables 1 8  
Affiliated Entity | US Holdings | 7.5% Term Loan due November 30, 2023 | Notes Payable, Other Payables      
Related Party Transaction [Line Items]      
Debt forgiven   300  
Affiliated Entity | US Holdings | Surplus Agreement Receivable      
Related Party Transaction [Line Items]      
Related party note receivable $ 0 $ 115  
Affiliated Entity | US Holdings | Minimum | Surplus Agreement Receivable      
Related Party Transaction [Line Items]      
Variable rate spread 0.05%    
Affiliated Entity | US Holdings | Maximum | Surplus Agreement Receivable      
Related Party Transaction [Line Items]      
Variable rate spread 0.20%