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Parent Company Financial Statements Parent Company Financial Statements (Balance Sheets) (Details) - USD ($) $ / shares in Units, $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and due from subsidiary banks | $ 1,758 | $ 1,236 |  |
Other short-term investments | 157 | 197 |  |
Premises and equipment | 400 | 454 |  |
Accrued income and other assets | 6,763 | 5,603 |  |
Total assets | 85,406 | 94,616 |  |
Total medium- and long-term debt | 3,024 | 2,796 |  |
Accrued expenses and other liabilities | 2,593 | 1,584 |  |
Total liabilities | $ 80,225 | $ 86,719 |  |
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 12/31/2022 and 12/31/2021 | $ 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 | 2,220 | 2,175 |  |
Accumulated other comprehensive loss | (3,742) | (212) | $ 64 |
Retained earnings | $ 11,258 | $ 10,494 |  |
Shares in treasury | 97,197,962 | 97,476,872 |  |
Less cost of common stock in treasury - 97,197,962 shares at 12/31/22 and 97,476,872 shares at 12/31/21 | $ (6,090) | $ (6,095) |  |
Total shareholders' equity | 5,181 | 7,897 | $ 8,050 | $ 7,327
Total liabilities and shareholders' equity | 85,406 | 94,616 |  |
Parent Company |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and due from subsidiary banks | 1,810 | 1,105 |  |
Other short-term investments | 92 | 113 |  |
Receivable due from subsidiary bank | 150 | 150 |  |
Investments in subsidiaries, principally banks | 4,853 | 8,278 |  |
Premises and equipment | 0 | 1 |  |
Accrued income and other assets | 191 | 265 |  |
Total assets | 7,096 | 9,912 |  |
Total medium- and long-term debt | 1,593 | 1,736 |  |
Accrued expenses and other liabilities | 322 | 279 |  |
Total liabilities | 1,915 | 2,015 |  |
Total liabilities and shareholders' equity | $ 7,096 | $ 9,912 |  |

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