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Reclassifications from Accumulated Other Comprehensive Income - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Equity [Abstract] |  |  |  |
Losses reclassified from accumulated other comprehensive earnings/(losses) to net earnings | $ 25 | $ 62 | $ 59 | $ 166

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