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Investment Securities - Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt securities available for sale: |  |
Due in one year or less | $ 3,248 |
Due after one year through five years | 4,691 |
Due after five years through ten years | 50 |
Total available for sale (amortized cost) | 7,989 |
Mortgage-backed securities | 4,408 |
Investment securities available for sale, amortized cost | 12,397 | $ 10,691
Debt securities held to maturity: |  |
Due in one year or less | 588 |
Due after one year through five years | 635 |
Due after five years through ten years | 1,369 |
Due after ten years | 883 |
Total available for held to maturity (amortized cost) | 3,475 |
Mortgage-backed securities | 11,603 |
Amortized cost for held to maturity | 15,078 | 15,330
Debt securities available for sale: |  |
Due in one year or less | 3,209 |
Due after one year through five years | 4,628 |
Due after five years through ten years | 44 |
Total available for sale (fair value) | 7,881 |
Mortgage-backed securities | 4,253 |
Total | 12,134 | 10,440
Debt securities held to maturity: |  |
Due in one year or less | 575 |
Due after one year through five years | 611 |
Due after five years through ten years | 1,333 |
Due after ten years | 829 |
Total available for held to maturity (fair value) | 3,348 |
Mortgage-backed securities | 10,517 |
Total | $ 13,865 | $ 14,308

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