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INVESTMENT SECURITIES - Schedule of Contractual Maturities of Debt Securities Available for Sale (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Amortized Cost
Due within one year	$ 988
Due after one year through five years	5,344
Due after five years through ten years	4,339
Due after ten years	1,163
Mortgage and asset-backed securities	7,591
Amortized Cost	19,425	$ 20,018
Fair Value
Due within one year	985
Due after one year through five years	5,212
Due after five years through ten years	4,112
Due after ten years	962
Mortgage and asset-backed securities	7,027
Fair Value	$ 18,298	$ 18,635

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