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Income Taxes - Deferred Tax Assets and Valuation Allowances (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Deferred tax assets and valuation allowances: |  |
Net operating loss, deferred tax assets | $ 1,416 | $ 2,024
Tax credits, deferred tax assets | 312 | $ 300
General Business Credits | Expires from 2036 - 2044 |  |
Deferred tax assets and valuation allowances: |  |
Tax credits, unused amount | 312 |
Tax credits, deferred tax assets | 312 |
Tax credits, valuation allowance | 0 |
U.S. Federal | Indefinite Tax Period |  |
Deferred tax assets and valuation allowances: |  |
Net operating loss, unused amount | 5,707 |
Net operating loss, deferred tax assets | 1,198 |
Net operating loss, valuation allowance | 0 |
State | Expires from 2024 - 2044 |  |
Deferred tax assets and valuation allowances: |  |
Net operating loss, unused amount | 4,560 |
Net operating loss, deferred tax assets | 194 |
Net operating loss, valuation allowance | (40) |
Foreign | Indefinite Tax Period |  |
Deferred tax assets and valuation allowances: |  |
Net operating loss, unused amount | 70 |
Net operating loss, deferred tax assets | 24 |
Net operating loss, valuation allowance | $ (24) |

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