Derivative Instruments and Hedging Activities - Schedule of Pre-Tax Effect of Changes in Fair Value from Derivative Instruments Not Designated as Hedging Instruments (Details) - Derivatives Not Designated as Hedging Instruments - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Mortgage derivatives - interest rate lock commitments | ||||
| Derivative [Line Items] | ||||
| Gain (Loss) Recognized in Consolidated Statements of Income | $ 2 | $ 0 | $ 2 | $ 0 |
| Mortgage derivatives - forward commitments to sell fixed-rate mortgage loans | ||||
| Derivative [Line Items] | ||||
| Gain (Loss) Recognized in Consolidated Statements of Income | 0 | 0 | 1 | 0 |
| Foreign exchange contracts | ||||
| Derivative [Line Items] | ||||
| Gain (Loss) Recognized in Consolidated Statements of Income | 0 | 0 | (1) | 0 |
| Visa derivative | ||||
| Derivative [Line Items] | ||||
| Gain (Loss) Recognized in Consolidated Statements of Income | $ 2 | $ 0 | $ 2 | $ 0 |