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Income Taxes - Tax Carryforwards and Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Operating Loss and Tax Credit Carryforwards [Line Items] |  |
Net operating loss carryforwards | $ 262 | $ 346
Tax credit carryforwards | 3,674 | $ 4,905
Federal [Member] |  |
Operating Loss and Tax Credit Carryforwards [Line Items] |  |
Net operating loss carryforwards | 1 |
Tax credit carryforwards | 3,324 |
State [Member] |  |
Operating Loss and Tax Credit Carryforwards [Line Items] |  |
Net operating loss carryforwards | 239 |
Tax credit carryforwards | 346 |
Net operating loss carryforwards with indefinite expiration period | 106 |
Tax credit carryforward with indefinite expiration period | 193 |
Foreign [Member] |  |
Operating Loss and Tax Credit Carryforwards [Line Items] |  |
Net operating loss carryforwards | 22 |
Tax credit carryforwards | 4 |
Net operating loss carryforwards with indefinite expiration period | $ 1 |

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