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Investment Securities - Schedule Of Amortized Cost And Fair Value By Contractual Maturity (Details) - USD ($) $ in Millions | Mar. 31, 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 | 1,311 |
Total | 1,311 |
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 | 1,131 |
Fair Value | 1,131 | $ 1,161
Amortized Cost |  |
Within 1 year | 49 |
After 1 year through 5 years | 129 |
After 5 years through 10 years | 372 |
After 10 years | 1,369 |
Subtotal | 1,919 |
Government agency issued MBS and CMO | 7,407 |
Securities available for sale, amortized cost | 9,326 |
Fair Value |  |
Within 1 year | 48 |
After 1 year through 5 years | 120 |
After 5 years through 10 years | 339 |
After 10 years | 1,205 |
Subtotal | 1,712 |
Government agency issued MBS and CMO | 6,436 |
Securities available-for-sale | $ 8,148 | $ 8,391

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