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Fair Value Measurements - Carrying Amounts and Estimated Fair Value for Financial Instrument Assets (Liabilities) (Detail) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Cash and cash equivalents |  |
Interest-bearing deposits at banks | $ 24,792 | $ 28,069
Investment securities | 29,894 | 26,897
Loans and leases, net | 132,798 | 131,939
Financial liabilities: |  |
Short-term borrowings | 264 | 316
Loan facility carrying amount | 11,319 | 8,201
Level 1 |  |
Cash and cash equivalents |  |
Cash and cash equivalents | 1,607 | 1,668
Interest-bearing deposits at banks | 0 | 0
Investment securities | 0 | 0
Loans and leases, net | 0 | 0
Financial liabilities: |  |
Time deposits | 0 | 0
Short-term borrowings | 0 | 0
Loan facility carrying amount | 0 | 0
Level 2 |  |
Cash and cash equivalents |  |
Cash and cash equivalents | 171 | 63
Interest-bearing deposits at banks | 24,792 | 28,069
Investment securities | 13,467 | 14,262
Loans and leases, net | 6,865 | 7,240
Financial liabilities: |  |
Time deposits | 17,463 | 20,715
Short-term borrowings | 4,764 | 5,316
Loan facility carrying amount | 11,282 | 8,107
Level 3 |  |
Cash and cash equivalents |  |
Cash and cash equivalents | 0 | 0
Interest-bearing deposits at banks | 0 | 0
Investment securities | 42 | 46
Loans and leases, net | 123,001 | 121,898
Financial liabilities: |  |
Time deposits | 0 | 0
Short-term borrowings | 0 | 0
Loan facility carrying amount | 0 | 0
Carrying Amount |  |
Cash and cash equivalents |  |
Cash and cash equivalents | 1,778 | 1,731
Interest-bearing deposits at banks | 24,792 | 28,069
Investment securities | 14,793 | 15,330
Loans and leases, net | 132,798 | 131,939
Financial liabilities: |  |
Time deposits | 17,513 | 20,759
Short-term borrowings | 4,764 | 5,316
Loan facility carrying amount | 11,319 | 8,201
Estimated Fair Value |  |
Cash and cash equivalents |  |
Cash and cash equivalents | 1,778 | 1,731
Interest-bearing deposits at banks | 24,792 | 28,069
Investment securities | 13,509 | 14,308
Loans and leases, net | 129,866 | 129,138
Financial liabilities: |  |
Time deposits | 17,463 | 20,715
Short-term borrowings | 4,764 | 5,316
Loan facility carrying amount | $ 11,282 | $ 8,107

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