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Investment Securities - Schedule of Amortized Cost and Fair Value by Contractual Maturity (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Amortized Cost |  |
Within 1 year | $ 0 |
After 1 year through 5 years | 0 |
After 5 years through 10 years | 0 |
After 10 years | 0 |
Subtotal | 0 |
Government agency issued MBS and CMO | 1,258 |
Total | 1,258 |
Fair Value |  |
Within 1 year | 0 |
After 1 year through 5 years | 0 |
After 5 years through 10 years | 0 |
After 10 years | 0 |
Subtotal | 0 |
Government agency issued MBS and CMO | 1,092 |
Fair Value | 1,092 | $ 1,083
Amortized Cost |  |
Within 1 year | 11 |
After 1 year through 5 years | 98 |
After 5 years through 10 years | 265 |
After 10 years | 1,207 |
Subtotal | 1,581 |
Government agency issued MBS and CMO | 7,375 |
Securities available for sale, amortized cost | 8,956 |
Fair Value |  |
Within 1 year | 11 |
After 1 year through 5 years | 92 |
After 5 years through 10 years | 237 |
After 10 years | 1,072 |
Subtotal | 1,412 |
Government agency issued MBS and CMO | 6,663 |
Securities available-for-sale | $ 8,075 | $ 7,896

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