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Significant Accounting Policies - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2022 | Jan. 01, 2023 | Feb. 27, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ 0.625 |  |  | $ 0.625 |  |
Performance obligation, description of timing | one year or less |  |  |  |  |
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] | Other assets |  |  | Other assets |  |
Past due threshold period for nonaccrual status | 90 days |  |  |  |  |
Past due threshold period for nonaccrual status, consumer real estate loans | 30 days |  |  |  |  |
Retained earnings | $ 3,430 |  |  | $ 2,891 |  |
Financing receivable, allowance for credit loss, excluding accrued interest | 685 |  |  | $ 670 | $ 963 | $ 200
ASU 2022-02 | Subsequent Event |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Retained earnings |  | $ 4 |  |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest |  | $ 6 |  |  |  |
TD Merger Agreement |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Common stock, par value (in dollars per share) |  |  | $ 0.625 |  |  |
Cash to be received per common share upon closing (in dollars per share) |  |  | 25.00 |  |  |
Additional cash to be received per common share upon closing, annual basis (in dollars per share) |  |  | 0.65 |  |  |
Additional cash to be received per common share upon closing, monthly basis (in dollars per share) |  |  | $ 0.054 |  |  |
Merger and integration expense | $ 87 |  |  |  |  |
Deposit Bases |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Intangible assets, amortization period | 10 years |  |  |  |  |
Minimum | Furniture and Fixtures |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Useful life of premises and equipment | 3 years |  |  |  |  |
Minimum | Building |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Useful life of premises and equipment | 7 years |  |  |  |  |
Maximum | Furniture and Fixtures |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Useful life of premises and equipment | 15 years |  |  |  |  |
Maximum | Building |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Useful life of premises and equipment | 45 years |  |  |  |  |
Non-Accruing |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Accounts receivable, net | $ 6 |  |  |  |  |

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