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Leases - Summary of Maturities of Lease Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Leases [Abstract]    
2021 $ 7  
2022 26  
2023 26  
2024 25  
2025 24  
Thereafter 218  
Total lease payments 326  
Less: imputed interest (74)  
Total present value of lease liabilities $ 252 $ 267