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Fair Value - Held to Maturity Investment Securities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Carrying Value
Schedule of Held-to-Maturity Securities [Line Items]
Held-to-maturity investment securities	$ 404	$ 234
Estimated Fair Value
Schedule of Held-to-Maturity Securities [Line Items]
Held-to-maturity investment securities	$ 400	$ 231

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- Definition

Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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