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Income Taxes - Net Deferred Tax Assets Reflected in Consolidated Balance Sheets (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Income Tax Disclosure [Abstract] |  |
Deferred tax assets | $ 1,451 | $ 1,134
Deferred tax liabilities | (112) | (172)
Net deferred tax assets | $ 1,339 | $ 962

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