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Income Taxes Income Taxes - Operating Loss and Tax Credit Carryforwards (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Operating Loss Carryforwards [Line Items] |  |
Operating Loss Carryforwards | $ 333 | $ 442
Tax Credit Carryforwards | 131 | 55
Total Operating Loss and Tax Credit Carryforwards | 464 | 497
Expiring within Five Years [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating Loss Carryforwards | 123 | 99
Tax Credit Carryforwards | 14 | 14
Expiring After Five Years Or Having Indefinite Expiration [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating Loss Carryforwards | 210 | 343
Tax Credit Carryforwards | $ 117 | $ 41

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