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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Income Tax Contingency [Line Items] |  |  |
Income tax refunds | $ 10 |  |
Income taxes paid |  | $ 0 | $ 8
Valuation allowance | 243 | $ 180 |
Gross tax liability for tax positions that may not be sustained under a more likely than not threshold | 7 |  |
Valuation allowance, net of federal benefit | $ 308 |  |
Research Tax Credit Carryforward [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Tax credit expiration year | 2041 |  |
Research and development credits | $ 14 |  |
Internal Revenue Service (IRS) [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Operating loss carryforward | 2,100 |  |
Tax effects on operating loss carryforwards | 443 |  |
Internal Revenue Service (IRS) [Member] | Indefinite Tax Period [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Operating loss carryforward | 1,768 |  |
Tax effects on operating loss carryforwards | $ 371 |  |
State and Local Jurisdiction [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Tax credit expiration year | 2024 |  |
Various tax credits | $ 48 |  |
State and Local Jurisdiction [Member] | State Net Operating Loss Carryforward [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Operating loss carryforward | $ 4,400 |  |
Tax credit expiration year | 2042 |  |
Minimum [Member] | Internal Revenue Service (IRS) [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Tax credit expiration year | 2036 |  |
Maximum [Member] | Internal Revenue Service (IRS) [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Tax credit expiration year | 2037 |  |

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