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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Income Tax Disclosure [Abstract] |  |
Allowance for loan and lease losses | $ 422 | $ 380
Employee benefits | 166 | 187
Net unrealized securities losses | 1,612 | 1,959
Federal net operating losses and credits | 3 | 4
Non-tax accruals | 142 | 61
Operating lease liabilities | 136 | 149
State net operating losses and credits | 1 | 1
Partnership investments | 78 | 90
Other | 148 | 164
Gross deferred tax assets | 2,708 | 2,995
Less: Valuation Allowance | 12 | 11
Total deferred tax assets | 2,696 | 2,984
Leasing transactions | 446 | 521
State taxes | 77 | 86
Operating lease right-of-use assets | 119 | 130
Goodwill | 157 | 139
Other | 82 | 86
Total deferred tax liabilities | 881 | 962
Net deferred tax assets (liabilities) | $ 1,815 | $ 2,022

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