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Income Taxes - Tax Carryforwards and Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Operating Loss and Tax Credit Carryforwards [Line Items] |  |
Net operating loss carryforwards | $ 380 | $ 350
Tax credit carryforwards | 3,406 | $ 3,259
Federal [Member] |  |
Operating Loss and Tax Credit Carryforwards [Line Items] |  |
Tax credit carryforwards | 3,060 |
State [Member] |  |
Operating Loss and Tax Credit Carryforwards [Line Items] |  |
Net operating loss carryforwards | 304 |
Tax credit carryforwards | 344 |
Tax credit carryforward with indefinite expiration period | 188 |
Foreign [Member] |  |
Operating Loss and Tax Credit Carryforwards [Line Items] |  |
Net operating loss carryforwards | 76 |
Tax credit carryforwards | 2 |
Operating loss carryforwards with indefinite expiration period | $ 58 |

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