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Income Taxes - Tax Carryforwards and Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Operating Loss and Tax Credit Carryforwards [Line Items] |  |
Net operating loss carryforwards | $ 233 | $ 262
Tax credit carryforwards | 3,057 | $ 3,674
Federal [Member] |  |
Operating Loss and Tax Credit Carryforwards [Line Items] |  |
Net operating loss carryforwards | 1 |
Tax credit carryforwards | 2,680 |
State [Member] |  |
Operating Loss and Tax Credit Carryforwards [Line Items] |  |
Net operating loss carryforwards | 214 |
Tax credit carryforwards | 371 |
Net operating loss carryforwards with indefinite expiration period | 78 |
Tax credit carryforward with indefinite expiration period | 192 |
Foreign [Member] |  |
Operating Loss and Tax Credit Carryforwards [Line Items] |  |
Net operating loss carryforwards | 18 |
Tax credit carryforwards | 6 |
Net operating loss carryforwards with indefinite expiration period | $ 1 |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-6 + Details
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