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Income Taxes (Tax Loss and Credit Carryforwards Expirations) (Details) $ in Millions | Dec. 31, 2020 USD ($)
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Income Tax Disclosure [Abstract] |
2021 | $ 20
2022 | 75
2023 | 12
2024 | 13
2025 | 27
Thereafter | 141
Unlimited | $ 145

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