Derivative Financial Instruments - Cumulative Basis Adjustments for Fair Value Hedges (Details) - USD ($) $ in Millions |
Mar. 31, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Short-Term Debt | ||
| Amounts recorded in the Consolidated Balance Sheet related to cumulative basis adjustments for fair value hedges | ||
| Carrying amount of the hedged item | $ (493) | $ 0 |
| Cumulative hedging adjustments included in the carrying amount-assets/(liabilities) | 7 | 0 |
| Long-Term Debt | ||
| Amounts recorded in the Consolidated Balance Sheet related to cumulative basis adjustments for fair value hedges | ||
| Carrying amount of the hedged item | (6,136) | (6,656) |
| Cumulative hedging adjustments included in the carrying amount-assets/(liabilities) | 58 | 36 |
| Hedging adjustments on discontinued hedging relationships | $ (107) | $ (114) |