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Consolidated Statements of Operations and Comprehensive Income (Parentheticals) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Income Statement [Abstract] |  |
Total net realized gains (losses) reclassified from AOCI | $ 24 | $ (319)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax | $ 4 | $ (40)

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