Financial Instruments: (Notional Amounts of Outstanding Derivative Instruments) (Details) - USD ($) $ in Millions |
Sep. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Derivative [Line Items] | ||
| Notional amount | $ 52,505 | $ 50,043 |
| Designated as Hedging Instrument | Foreign exchange contracts | ||
| Derivative [Line Items] | ||
| Notional amount | 29,239 | 29,062 |
| Designated as Hedging Instrument | Interest rate contracts | ||
| Derivative [Line Items] | ||
| Notional amount | 4,800 | 4,700 |
| Designated as Hedging Instrument | Commodity contracts | ||
| Derivative [Line Items] | ||
| Notional amount | 2 | 3 |
| Not Designated as Hedging Instrument | Foreign exchange contracts | ||
| Derivative [Line Items] | ||
| Notional amount | $ 18,464 | $ 16,278 |