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Parent Company FInancial Statements Parent Company Financial Statements (Balance Sheets) (Details) - USD ($) $ / shares in Units, $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and due from subsidiary bank | $ 1,443 | $ 1,758 |  |
Other short-term investments | 399 | 157 |  |
Accrued income and other assets | 7,194 | 6,763 |  |
Total assets | 85,834 | 85,406 |  |
Medium- and long-term debt | 6,206 | 3,024 |  |
Accrued expenses and other liabilities | 2,895 | 2,593 |  |
Total liabilities | $ 79,428 | $ 80,225 |  |
Preferred Stock, No Par Value | $ 0 | $ 0 |  |
Preferred Stock, Shares Authorized | 4,000 | 4,000 |  |
Preferred Stock, Shares Issued | 4,000 | 4,000 |  |
Fixed rate reset non-cumulative perpetual preferred stock, series A, no par value, $100,000 liquidation preference per share: Authorized - 4,000 shares, Issued - 4,000 shares at 12/31/2023 and 12/31/2022 | $ 394 | $ 394 |  |
Common stock, par value | $ 5 | $ 5 |  |
Common stock, authorized shares | 325,000,000 | 325,000,000 |  |
Common stock, issued shares | 228,164,824 | 228,164,824 |  |
Common stock - $5 par value: Authorized - 325,000,000 shares; Issued - 228,164,824 shares | $ 1,141 | $ 1,141 |  |
Capital surplus | 2,224 | 2,220 |  |
Accumulated other comprehensive loss | (3,048) | (3,742) | $ (212) |
Retained earnings | 11,727 | 11,258 |  |
Less cost of common stock in treasury - 96,266,568 shares at 12/31/23 and 97,197,962 shares at 12/31/22 | (6,032) | (6,090) |  |
Total shareholders' equity | 6,406 | 5,181 | $ 7,897 | $ 8,050
Total liabilities and shareholders' equity | 85,834 | 85,406 |  |
Parent Company |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and due from subsidiary bank | 1,415 | 1,810 |  |
Other short-term investments | 104 | 92 |  |
Due from Affiliates | 0 | 150 |  |
Investments in subsidiaries, principally banks | 5,777 | 4,853 |  |
Accrued income and other assets | 180 | 191 |  |
Total assets | 7,476 | 7,096 |  |
Medium- and long-term debt | 764 | 1,593 |  |
Accrued expenses and other liabilities | 306 | 322 |  |
Total liabilities | 1,070 | 1,915 |  |
Fixed rate reset non-cumulative perpetual preferred stock, series A, no par value, $100,000 liquidation preference per share: Authorized - 4,000 shares, Issued - 4,000 shares at 12/31/2023 and 12/31/2022 |  | 394 |  |
Common stock - $5 par value: Authorized - 325,000,000 shares; Issued - 228,164,824 shares |  | 1,141 |  |
Capital surplus |  | 2,220 |  |
Accumulated other comprehensive loss | (3,048) | (3,742) |  |
Retained earnings |  | 11,258 |  |
Less cost of common stock in treasury - 96,266,568 shares at 12/31/23 and 97,197,962 shares at 12/31/22 |  | (6,090) |  |
Total shareholders' equity | 6,406 | 5,181 |  |
Total liabilities and shareholders' equity | $ 7,476 | $ 7,096 |  |

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