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Condensed Financial Information Parent Company Balance Sheets (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Assets |  |  |  |
Interest-bearing deposits in other banks | $ 4,166 | $ 9,230 |  |
Debt securities available for sale | 28,104 | 27,933 |  |
Premises, equipment and software, net | 1,642 | 1,718 |  |
Other assets | 8,815 | 9,029 |  |
Total assets | 152,194 | 155,220 |  |
Liabilities and Stockholder's Equity [Abstract] |  |  |  |
Long-term borrowings | 2,330 | 2,284 |  |
Other liabilities | 4,583 | 5,242 |  |
Total liabilities | 134,701 | 139,269 |  |
Equity [Abstract] |  |  |  |
Preferred Stock, Carrying Amount | 1,659 | 1,659 |  |
Common stock | 10 | 10 |  |
Additional paid-in capital | 11,757 | 11,988 |  |
Retained earnings | 8,186 | 7,004 |  |
Treasury Stock, Value | (1,371) | (1,371) |  |
Accumulated other comprehensive income (loss), net | (2,812) | (3,343) | $ 289 | $ 1,315
Total shareholders’ equity | 17,429 | 15,947 | $ 18,326 | $ 18,111
Total liabilities and stockholders’ equity | 152,194 | 155,220 |  |
Parent Company [Member] |  |  |  |
Assets |  |  |  |
Interest-bearing deposits in other banks | 1,869 | 1,594 |  |
Debt securities available for sale | 20 | 21 |  |
Premises, equipment and software, net | 47 | 28 |  |
Investments in subsidiaries | 17,307 | 16,061 |  |
Other assets | 291 | 275 |  |
Total assets | 19,534 | 17,979 |  |
Liabilities and Stockholder's Equity [Abstract] |  |  |  |
Long-term borrowings | 1,832 | 1,786 |  |
Other liabilities | 273 | 246 |  |
Total liabilities | 2,105 | 2,032 |  |
Equity [Abstract] |  |  |  |
Preferred Stock, Carrying Amount | 1,659 | 1,659 |  |
Common stock | 10 | 10 |  |
Additional paid-in capital | 11,757 | 11,988 |  |
Retained earnings | 8,186 | 7,004 |  |
Treasury Stock, Value | (1,371) | (1,371) |  |
Accumulated other comprehensive income (loss), net | (2,812) | (3,343) |  |
Total shareholders’ equity | 17,429 | 15,947 |  |
Total liabilities and stockholders’ equity | 19,534 | 17,979 |  |
Parent Company [Member] | Bank [Member] |  |  |  |
Assets |  |  |  |
Investments in subsidiaries | 16,882 | 15,676 |  |
Parent Company [Member] | Non-Bank [Member] |  |  |  |
Assets |  |  |  |
Investments in subsidiaries | $ 425 | $ 385 |  |

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