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Investment Securities - Schedule of Amortized Cost and Fair Value by Contractual Maturity (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
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 | 1,282 |
Total | 1,282 |
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 | 1,144 |
Fair Value | 1,144 | $ 1,161
Amortized Cost |  |
Within 1 year | 41 |
After 1 year through 5 years | 123 |
After 5 years through 10 years | 378 |
After 10 years | 1,307 |
Subtotal | 1,849 |
Government agency issued MBS and CMO | 7,284 |
Securities available for sale, amortized cost | 9,133 |
Fair Value |  |
Within 1 year | 41 |
After 1 year through 5 years | 117 |
After 5 years through 10 years | 352 |
After 10 years | 1,184 |
Subtotal | 1,694 |
Government agency issued MBS and CMO | 6,554 |
Securities available-for-sale | $ 8,248 | $ 8,391

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