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Income Taxes - Operating Loss Carryforwards, General Business Credit Carryforwards, and Tax Credit Carryforwards (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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General business credit carryforwards |  |
Net operating loss carryforwards: |  |
General business credit carryforwards | $ 12 | $ 41
Federal |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards | 178 | 443
State |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards | 3,763 | 3,944
Foreign |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards | 2,580 | $ 3,343
Expire 2022 through 2041 | Foreign |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards | 375 |
Expire 2027 | General business credit carryforwards |  |
Net operating loss carryforwards: |  |
General business credit carryforwards | $ 12 |

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