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Related Party Transactions (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Related Party Transaction [Line Items]            
Related party note receivable   $ 0   $ 0   $ 115
7.5% Term Loan due November 30, 2022 | 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   3 $ 5 7 $ 22  
Receivables   4   4   6
Payables   1   1   10
Affiliated Entity | US Holdings | 7.5% Term Loan due November 30, 2022 | 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   $ 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%