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Reclassifications from Accumulated Other Comprehensive Income - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Equity [Abstract] |  |  |
Transfer of realized (gains)/losses in fair value to earnings | $ 285 | $ 279 | $ 169

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