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Related Party Transactions (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Dec. 31, 2019
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Related Party Transaction [Line Items]        
Related party note receivable   $ 0   $ 0
Affiliated Entity | Leonardo S.p.A.        
Related Party Transaction [Line Items]        
Revenue from related parties   1 $ 2  
Receivables   3   2
Payables   2   1
Affiliated Entity | US Holdings | Surplus Agreement Receivable        
Related Party Transaction [Line Items]        
Related party note receivable   $ 0   $ 0
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%