Income Taxes - Changes in the Valuation Allowance for Deferred Tax Assets (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
|
| Changes In The Valuation Allowance For Deferred Tax Assets, Valuation Allowance [Roll Forward] | |||
| Beginning balance | $ 3,679 | $ 3,295 | $ 2,907 |
| Additions charged to income tax expense and other accounts | 910 | 469 | 433 |
| Deductions from reserves | (91) | (84) | (45) |
| Ending balance | $ 4,498 | $ 3,679 | $ 3,295 |