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Goodwill and Specifically Identifiable Intangible Assets - Future Estimated Amortization of Specifically Identifiable Intangible Assets (Details)
$ in Millions
Dec. 31, 2023
USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2024 $ 37
2025 37
2026 37
2027 37
2028 37
Thereafter $ 294