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Leases (Maturities of Lease Liabilities) (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Leases [Abstract]    
2022 (remainder) $ 4  
2023 5  
2024 3  
2025 2  
2026 2  
2027 2  
Thereafter 10  
Total lease payments 28  
Less imputed interest (6)  
Total $ 22 $ 23