Fair Value of Financial Instruments - Derivative Fair Value Measurements, Narrative (Details) - USD ($) $ in Millions |
6 Months Ended | 12 Months Ended |
|---|---|---|
Jun. 30, 2026 |
Dec. 31, 2025 |
|
| Fair Value Disclosures [Abstract] | ||
| Total derivative assets valued with prices provided by models and other valuation techniques (as a percent) | 6.00% | |
| Total derivative liabilities valued with prices provided by models and other valuation techniques (as a percent) | 12.00% | |
| Credit reserve change in fair value increase (decrease) | $ 1 | $ 0 |