Fair Value of Financial Instruments (Company's Assets And Liabilities Measured At Fair Value On Recurring Basis) (Parenthetical) (Details) - USD ($) $ in Millions |
Jun. 30, 2025 |
Dec. 31, 2024 |
Jun. 30, 2024 |
|---|---|---|---|
| Accounts, Notes, Loans and Financing Receivable [Line Items] | |||
| Exchange-traded bond fund | $ 10 | $ 10 | |
| Corporate Obligations [Member] | Loans Carried at Fair Value [Member] | |||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | |||
| Loans receivable at fair value | $ 15 | $ 15 | $ 9 |