Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2023 |
Dec. 31, 2022 |
Dec. 31, 2021 |
|
| Income Tax Disclosure [Abstract] | |||
| Unrecognized tax benefits that, if recognized, would result in adjustments to the valuation allowance | $ 183 | ||
| Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] | |||
| Unrecognized tax benefits at beginning of year | 69 | $ 69 | $ 7 |
| Increases related to current year tax positions | 47 | 19 | 62 |
| Increases related to prior year tax positions | 67 | 0 | 0 |
| Decreases related to prior year tax positions | 0 | (19) | 0 |
| Unrecognized tax benefits at end of year | $ 183 | $ 69 | $ 69 |