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Fair Value Measurements - Fair Value Disclosures of Financial Instruments (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
ASSETS |  |  |
Held-to-maturity securities |  | $ 8,622 | $ 7,395
Loans, net of unearned income (residential) |  | 106,541 | 104,260
Loans held for sale | [1] | 1,077 | 797
LIABILITIES |  |  |
Time deposits, carrying amount |  | 12,680 |
Long-term debt, carrying amount |  | 9,917 | 12,105
Carrying Amount |  |  |
ASSETS |  |  |
Cash and short-term investments |  | 11,450 | 19,247
Held-to-maturity securities |  | 8,622 | 7,395
Other investments |  | 863 | 967
Loans, net of unearned income (residential) |  | 105,103 | 102,841
Loans held for sale |  | 928 | 704
LIABILITIES |  |  |
Time deposits, carrying amount |  | 12,680 | 16,952
Short-term borrowings, carrying amount |  | 263 | 1,264
Long-term debt, carrying amount |  | 9,917 | 12,105
Deposits with no stated maturity |  | 136,033 | 132,808
Estimate of Fair Value Measurement |  |  |
ASSETS |  |  |
Cash and short-term investments |  | 11,450 | 19,247
Held-to-maturity securities |  | 8,313 | 6,837
Other investments |  | 863 | 967
Loans, net of unearned income (residential) |  | 101,946 | 99,105
Loans held for sale |  | 928 | 704
LIABILITIES |  |  |
Time deposits |  | 12,731 | 17,068
Short-term borrowings |  | 263 | 1,264
Long-term debt |  | 10,047 | 11,907
Deposits with no stated maturity |  | 136,033 | 132,808
Estimate of Fair Value Measurement | Level 1 |  |  |
ASSETS |  |  |
Cash and short-term investments |  | 11,450 | 19,247
Held-to-maturity securities |  | 0 | 0
Other investments |  | 0 | 0
Loans, net of unearned income (residential) |  | 0 | 0
Loans held for sale |  | 0 | 0
LIABILITIES |  |  |
Time deposits |  | 0 | 0
Short-term borrowings |  | 0 | 0
Long-term debt |  | 9,318 | 11,430
Deposits with no stated maturity |  | 0 | 0
Estimate of Fair Value Measurement | Level 2 |  |  |
ASSETS |  |  |
Cash and short-term investments |  | 0 | 0
Held-to-maturity securities |  | 8,313 | 6,837
Other investments |  | 0 | 0
Loans, net of unearned income (residential) |  | 0 | 0
Loans held for sale |  | 0 | 0
LIABILITIES |  |  |
Time deposits |  | 12,731 | 17,068
Short-term borrowings |  | 263 | 1,264
Long-term debt |  | 729 | 477
Deposits with no stated maturity |  | 136,033 | 132,808
Estimate of Fair Value Measurement | Level 3 |  |  |
ASSETS |  |  |
Cash and short-term investments |  | 0 | 0
Held-to-maturity securities |  | 0 | 0
Other investments |  | 863 | 967
Loans, net of unearned income (residential) |  | 101,946 | 99,105
Loans held for sale |  | 928 | 704
LIABILITIES |  |  |
Time deposits |  | 0 | 0
Short-term borrowings |  | 0 | 0
Long-term debt |  | 0 | 0
Deposits with no stated maturity |  | $ 0 | $ 0
[1] | Total loans held for sale include Real estate — residential mortgage loans held for sale at fair value of $149 million at December 31, 2025, and $93 million at December 31, 2024

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