Fair Value Measurements And Disclosure (Notional Amount Of Our Outstanding Derivative Positions) (Details) - USD ($) $ in Millions |
Sep. 30, 2024 |
Dec. 31, 2023 |
|---|---|---|
| Derivative [Line Items] | ||
| Notional amounts of outstanding derivative positions | $ 35,351 | $ 39,756 |
| Interest rate swaps | ||
| Derivative [Line Items] | ||
| Notional amounts of outstanding derivative positions | 0 | 1,750 |
| Cross-currency swaps | ||
| Derivative [Line Items] | ||
| Notional amounts of outstanding derivative positions | $ 35,351 | $ 38,006 |