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 | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Mortgage derivatives - interest rate lock commitments | ||||
| Derivative [Line Items] | ||||
| Gain (Loss) Recognized in Consolidated Statements of Income | $ (2) | $ 0 | $ 0 | $ 0 |
| Mortgage derivatives - forward commitments to sell fixed-rate mortgage loans | ||||
| Derivative [Line Items] | ||||
| Gain (Loss) Recognized in Consolidated Statements of Income | 1 | 0 | 2 | 0 |
| Foreign exchange contracts | ||||
| Derivative [Line Items] | ||||
| Gain (Loss) Recognized in Consolidated Statements of Income | 1 | 0 | 0 | 0 |
| Visa derivative | ||||
| Derivative [Line Items] | ||||
| Gain (Loss) Recognized in Consolidated Statements of Income | $ 3 | $ 0 | $ 5 | $ 0 |