Financial Instruments - Cumulative Basis Adjustments for Fair Value Hedges (Details) - USD ($) $ in Millions |
Sep. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Fair Value Disclosures [Abstract] | ||
| Carrying amount of the hedged item assets/(liabilities) | $ (6,688) | $ 0 |
| Cumulative amount of fair value hedging adjustment included in the carrying amount assets/(liabilities) | $ 257 | $ 0 |