Basis of Presentation and Summary of Significant Accounting Policies (Narrative, Inventories) (Details) - USD ($) $ in Millions |
Jun. 30, 2026 |
Jun. 30, 2025 |
|---|---|---|
| Accounting Policies [Abstract] | ||
| Portion of inventories held at LIFO, percentage | 52.00% | 52.00% |
| Inventory Reserve Table [Line Items] | ||
| Portion of inventories held at LIFO, percentage | 52.00% | 52.00% |
| Inventory Reserve Excess and Obsolete [Member] | ||
| Inventory Reserve Table [Line Items] | ||
| Reserves for excess and obsolete inventory | $ 107 | $ 132 |