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Intangible Assets - Definite Life Intangible Assets (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |  |
Amortization of intangible assets | $ 31,000,000 | $ 32,000,000 | $ 93,000,000 | $ 101,000,000
Retirement of assets |  |  | 0 | 0
Impairments of definite lived intangible assets |  |  | $ 0 | $ 0

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