Supplementary Financial Information - Restricted Cash Balance Sheet Location (Details) - USD ($) $ in Millions |
Sep. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Restricted Cash and Cash Equivalent Item [Line Items] | ||
| Total Restricted cash | $ 118 | $ 53 |
| Balance Sheet Location [Axis]: us-gaap:OtherAssetsCurrent | ||
| Restricted Cash and Cash Equivalent Item [Line Items] | ||
| Total Restricted cash | 95 | 31 |
| Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent | ||
| Restricted Cash and Cash Equivalent Item [Line Items] | ||
| Total Restricted cash | $ 23 | $ 22 |