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Income Taxes - Operating Loss Carryforwards, General Business Credit Carryforwards, and Tax Credit Carryforwards (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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General business credit carryforwards |  |
Net operating loss carryforwards: |  |
General business credit carryforwards | $ 41 | $ 57
Federal |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards | 443 | 1,674
State |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards | 3,944 | 4,636
Foreign |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards | 3,343 | $ 3,201
Expire 2021 through 2037 | Federal |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards | 443 |
Expire 2021 through 2040 | State |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards | 3,900 |
Expire 2020 through 20440 | Foreign |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards | 263 |
Expire 2025 through 2038 | General business credit carryforwards |  |
Net operating loss carryforwards: |  |
General business credit carryforwards | $ 41 |

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