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Income Taxes Income Taxes - Operating Loss and Tax Credit Carryforwards (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Operating Loss Carryforwards [Line Items] |  |
Operating Loss Carryforwards | $ 442 | $ 531
Tax Credit Carryforwards | 55 | 230
Total Operating Loss and Tax Credit Carryforwards | 497 | 761
Expiring within Five Years [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating Loss Carryforwards | 99 | 131
Tax Credit Carryforwards | 14 | 30
Expiring After Five Years Or Having Indefinite Expiration [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating Loss Carryforwards | 343 | 400
Tax Credit Carryforwards | $ 41 | $ 200

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