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v3.26.1

Retirement and Benefit Plans - Narrative (Details) - Pension Plan $ in Millions | 3 Months Ended | 5 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jun. 30, 2026 USD ($) | Jun. 30, 2026 USD ($) | Jun. 30, 2026 USD ($)
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Curtailment gain | $ 6 |  | $ 6
Expense related to retirement termination benefit | 0 |  | $ 11
Acquired Comerica Plans |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Vesting period (years) |  |  | 3 years
Nonqualified Plan | Acquired Comerica Plans |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Accumulated benefit obligation | 149 | $ 149 | $ 149
Qualified Plan |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Fees paid for accounting and administrative duties to Trustee |  | 0 |
Qualified Plan | Acquired Comerica Plans |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Accumulated benefit obligation | $ 1,557 | $ 1,557 | $ 1,557
Fixed Income Securities | Qualified Plan | Minimum |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Target allocations for plan investments | 55.00% | 55.00% | 55.00%
Fixed Income Securities | Qualified Plan | Maximum |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Target allocations for plan investments | 65.00% | 65.00% | 65.00%
Equity securities | Qualified Plan | Minimum |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Target allocations for plan investments | 35.00% | 35.00% | 35.00%
Equity securities | Qualified Plan | Maximum |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Target allocations for plan investments | 45.00% | 45.00% | 45.00%

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