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Reclassifications from Accumulated Other Comprehensive Income - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Equity [Abstract] |  |  |  |
Transfer of realized losses/(gains) in fair value to earnings | $ 62 | $ 59 | $ 166 | $ 88

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