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Income Taxes - Operating Loss Carryforwards, General Business Credit Carryforwards, and Tax Credit Carryforwards (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
General business credit carryforwards |  |
Net operating loss carryforwards: |  |
General business credit carryforwards | $ 57 | $ 0
Federal |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards | 1,674 | 27
State |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards | 4,636 | 479
Foreign |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards | 3,201 | $ 465
Expire 2020 through 2037 | Federal |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards | 1,700 |
Expire 2021 through 2039 | State |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards | 4,600 |
Expire 2020 through 2039 | Foreign |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards | 209 |
Expire 2027 through 2039 | General business credit carryforwards |  |
Net operating loss carryforwards: |  |
General business credit carryforwards | $ 57 |

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