Financial Instruments Cross-currency forward-exchange contracts (Details) - Derivatives Designated as Hedging Instruments: - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Forward-starting interest rate swap contracts | ||||
| Derivative [Line Items] | ||||
| Unrecognized net (losses)/gains on interest swap contracts, net of tax | $ 0 | $ (2) | $ 0 | $ (13) |
| Foreign exchange derivative instruments | ||||
| Derivative [Line Items] | ||||
| Unrecognized net (losses)/gains on interest swap contracts, net of tax | $ 6 | $ (74) | $ 20 | $ (107) |