Fair Value Measurements (Details) - Financial Instruments - USD ($) $ in Millions |
Mar. 31, 2024 |
Dec. 31, 2023 |
|---|---|---|
| Financial Instruments | ||
| Short-term securities | $ 4,682 | $ 5,137 |
| Carrying Value [Member] | ||
| Financial Instruments | ||
| Short-term securities | 4,682 | 5,137 |
| Debt | 7,932 | 7,931 |
| Commercial paper | 100 | 100 |
| Fair Value [Member] | ||
| Financial Instruments | ||
| Short-term securities | 4,682 | 5,137 |
| Debt | 7,406 | 7,645 |
| Commercial paper | 100 | 100 |
| Fair Value [Member] | Level 1 [Member] | ||
| Financial Instruments | ||
| Short-term securities | 999 | 1,171 |
| Debt | 0 | 0 |
| Commercial paper | 0 | 0 |
| Fair Value [Member] | Level 2 [Member] | ||
| Financial Instruments | ||
| Short-term securities | 3,634 | 3,912 |
| Debt | 7,406 | 7,645 |
| Commercial paper | 100 | 100 |
| Fair Value [Member] | Level 3 [Member] | ||
| Financial Instruments | ||
| Short-term securities | 49 | 54 |
| Debt | 0 | 0 |
| Commercial paper | $ 0 | $ 0 |