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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities Included in "Accrued Income and Other Assets" and "Accrued Expense and Other Liabilities" (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Allowance for loan and lease losses | $ 236 | $ 232
Employee benefits | 164 | 170
Net unrealized securities losses | 0 | 144
Federal net operating losses and credits | 81 | 34
Fair value adjustments | 21 | 41
Non-tax accruals | 61 | 80
Operating lease liabilities | 178 |
State net operating losses and credits | 1 | 3
Other | 245 | 221
Gross deferred tax assets | 987 | 925
Less: Valuation Allowance | 0 | 11
Total deferred tax assets | 987 | 914
Leasing transactions | 628 | 531
Net unrealized securities gains | 117 | 0
Operating lease right-of-use assets | 156 |
Other | 175 | 161
Total deferred tax liabilities | 1,076 | 692
Net deferred tax assets (liabilities) | $ (89) |
Net deferred tax assets (liabilities) |  | $ 222

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