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Fair Value Measurements - Fair Value Disclosures of Financial Instruments (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
ASSETS |  |  |
Trading account assets |  | $ 1,142 | $ 829
Derivative assets |  | 181 | 1,024
Securities available for sale |  | 37,185 | 39,117
Held-to-maturity securities |  | 8,575 | 8,710
Loans, net of unearned income |  | 112,606 | 119,394
Loans held for sale, carrying amount | [1] | 483 | 963
LIABILITIES |  |  |
Long-term debt, carrying amount |  | 19,554 | 19,307
Carrying Amount |  |  |
ASSETS |  |  |
Trading account assets |  | 1,142 | 829
Other investments |  | 1,244 | 1,308
Loans, net of unearned income (residential) |  | 9 | 9
Loans held for sale (residential) |  | 51 | 24
Securities available for sale |  | 37,185 | 39,117
Held-to-maturity securities |  | 8,575 | 8,710
Loans, net of unearned income |  | 111,089 | 118,048
Loans held for sale, carrying amount |  | 432 | 939
Cash and short-term investments |  | 11,758 | 3,319
LIABILITIES |  |  |
Time deposits, carrying amount |  | 14,776 | 7,373
Short-term borrowings, carrying amount |  | 3,091 | 9,463
Long-term debt, carrying amount |  | 19,554 | 19,307
Deposits with no stated maturity |  | 130,811 | 135,222
Estimate of Fair Value Measurement |  |  |
ASSETS |  |  |
Trading account assets |  | 1,142 | 829
Other investments |  | 1,244 | 1,308
Loans, net of unearned income (residential) |  | 9 | 9
Loans held for sale (residential) |  | 51 | 24
Securities available for sale |  | 37,185 | 39,117
Held-to-maturity securities |  | 8,056 | 8,113
Loans, net of unearned income |  | 105,950 | 112,590
Loans held for sale, carrying amount |  | 432 | 939
Cash and short-term investments |  | 11,758 | 3,319
LIABILITIES |  |  |
Time deposits |  | 14,911 | 7,392
Short-term borrowings |  | 3,091 | 9,463
Long-term debt |  | 19,008 | 18,881
Deposits with no stated maturity |  | 130,811 | 135,222
Estimate of Fair Value Measurement | Level 1 |  |  |
ASSETS |  |  |
Trading account assets |  | 0 | 0
Other investments |  | 0 | 4
Loans, net of unearned income (residential) |  | 0 | 0
Loans held for sale (residential) |  | 0 | 0
Securities available for sale |  | 0 | 0
Held-to-maturity securities |  | 0 | 0
Loans, net of unearned income |  | 0 | 0
Loans held for sale, carrying amount |  | 0 | 0
Cash and short-term investments |  | 11,758 | 3,319
LIABILITIES |  |  |
Time deposits |  | 0 | 0
Short-term borrowings |  | 30 | 126
Long-term debt |  | 11,288 | 12,196
Deposits with no stated maturity |  | 0 | 0
Estimate of Fair Value Measurement | Level 2 |  |  |
ASSETS |  |  |
Trading account assets |  | 1,142 | 829
Other investments |  | 0 | 0
Loans, net of unearned income (residential) |  | 0 | 0
Loans held for sale (residential) |  | 51 | 24
Securities available for sale |  | 37,185 | 39,117
Held-to-maturity securities |  | 8,056 | 8,113
Loans, net of unearned income |  | 0 | 0
Loans held for sale, carrying amount |  | 0 | 0
Cash and short-term investments |  | 0 | 0
LIABILITIES |  |  |
Time deposits |  | 14,911 | 7,392
Short-term borrowings |  | 3,061 | 9,337
Long-term debt |  | 7,720 | 6,685
Deposits with no stated maturity |  | 130,811 | 135,222
Estimate of Fair Value Measurement | Level 3 |  |  |
ASSETS |  |  |
Trading account assets |  | 0 | 0
Other investments |  | 1,183 | 1,234
Loans, net of unearned income (residential) |  | 9 | 9
Loans held for sale (residential) |  | 0 | 0
Securities available for sale |  | 0 | 0
Held-to-maturity securities |  | 0 | 0
Loans, net of unearned income |  | 105,950 | 112,590
Loans held for sale, carrying amount |  | 432 | 939
Cash and short-term investments |  | 0 | 0
LIABILITIES |  |  |
Time deposits |  | 0 | 0
Short-term borrowings |  | 0 | 0
Long-term debt |  | 0 | 0
Deposits with no stated maturity |  | 0 | 0
Estimate of Fair Value Measurement | Measured at NAV |  |  |
ASSETS |  |  |
Other investments |  | 61 | 70
Not Designated as Hedging Instrument | Carrying Amount |  |  |
ASSETS |  |  |
Derivative assets |  | 168 | 927
LIABILITIES |  |  |
Derivative liabilities |  | 1,304 | 1,485
Not Designated as Hedging Instrument | Estimate of Fair Value Measurement |  |  |
ASSETS |  |  |
Derivative assets |  | 168 | 927
Derivative assets, netting adjustment |  | (792) | (740)
LIABILITIES |  |  |
Derivative liabilities |  | 1,304 | 1,485
Derivative liabilities, netting adjustment |  | (461) | (1,262)
Not Designated as Hedging Instrument | Estimate of Fair Value Measurement | Level 1 |  |  |
ASSETS |  |  |
Derivative assets |  | 74 | 112
LIABILITIES |  |  |
Derivative liabilities |  | 58 | 107
Not Designated as Hedging Instrument | Estimate of Fair Value Measurement | Level 2 |  |  |
ASSETS |  |  |
Derivative assets |  | 886 | 1,552
LIABILITIES |  |  |
Derivative liabilities |  | 1,707 | 2,637
Not Designated as Hedging Instrument | Estimate of Fair Value Measurement | Level 3 |  |  |
ASSETS |  |  |
Derivative assets |  | 0 | 3
LIABILITIES |  |  |
Derivative liabilities |  | 0 | 3
Designated as Hedging Instrument | Carrying Amount |  |  |
ASSETS |  |  |
Derivative assets |  | 13 | 97
LIABILITIES |  |  |
Derivative liabilities |  | 0 | 3
Designated as Hedging Instrument | Estimate of Fair Value Measurement |  |  |
ASSETS |  |  |
Derivative assets |  | 13 | 97
Derivative assets, netting adjustment |  | (26) | (17)
LIABILITIES |  |  |
Derivative liabilities |  | 0 | 3
Derivative liabilities, netting adjustment |  | (12) |
Designated as Hedging Instrument | Estimate of Fair Value Measurement | Level 1 |  |  |
ASSETS |  |  |
Derivative assets |  | 0 | 0
LIABILITIES |  |  |
Derivative liabilities |  | 0 | 0
Designated as Hedging Instrument | Estimate of Fair Value Measurement | Level 2 |  |  |
ASSETS |  |  |
Derivative assets |  | 39 | 114
LIABILITIES |  |  |
Derivative liabilities |  | 12 | 3
Designated as Hedging Instrument | Estimate of Fair Value Measurement | Level 3 |  |  |
ASSETS |  |  |
Derivative assets |  | 0 | 0
LIABILITIES |  |  |
Derivative liabilities |  | $ 0 | $ 0
[1] | Total loans held for sale include Real estate — residential mortgage loans held for sale at fair value of $51 million at December 31, 2023, and $24 million at December 31, 2022

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