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Income Taxes - Deferred Tax Assets and Valuation Allowances (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Deferred tax assets and valuation allowances: |  |
Net operating loss, deferred tax assets | $ 2,024 | $ 2,007
Tax credits, deferred tax assets | 300 | $ 303
General Business Credits | Expires from 2036 - 2042 |  |
Deferred tax assets and valuation allowances: |  |
Tax credits, unused amount | 300 |
Tax credits, deferred tax assets | 300 |
Tax credits, valuation allowance | 0 |
U.S. Federal | Indefinite Tax Period |  |
Deferred tax assets and valuation allowances: |  |
Net operating loss, unused amount | 6,565 |
Net operating loss, deferred tax assets | 1,379 |
Net operating loss, valuation allowance | 0 |
U.S. Federal | Expires from 2035 - 2037 |  |
Deferred tax assets and valuation allowances: |  |
Net operating loss, unused amount | 1,716 |
Net operating loss, deferred tax assets | 360 |
Net operating loss, valuation allowance | 0 |
State | Expires from 2024 - 2043 |  |
Deferred tax assets and valuation allowances: |  |
Net operating loss, unused amount | 5,293 |
Net operating loss, deferred tax assets | 254 |
Net operating loss, valuation allowance | (46) |
Foreign | Indefinite Tax Period |  |
Deferred tax assets and valuation allowances: |  |
Net operating loss, unused amount | 90 |
Net operating loss, deferred tax assets | 31 |
Net operating loss, valuation allowance | $ (31) |

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