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Income Taxes - Tax Carryforwards and Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Operating Loss and Tax Credit Carryforwards [Line Items] |  |
Net operating loss carryforwards | $ 299 | $ 380
Tax credit carryforwards | 3,859 | $ 3,406
Federal [Member] |  |
Operating Loss and Tax Credit Carryforwards [Line Items] |  |
Net operating loss carryforwards | 2 |
Tax credit carryforwards | 3,508 |
State [Member] |  |
Operating Loss and Tax Credit Carryforwards [Line Items] |  |
Net operating loss carryforwards | 280 |
Tax credit carryforwards | 348 |
Tax credit carryforward with indefinite expiration period | 191 |
Foreign [Member] |  |
Operating Loss and Tax Credit Carryforwards [Line Items] |  |
Net operating loss carryforwards | 17 |
Tax credit carryforwards | $ 3 |

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