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Segment Reporting Segment Asset Reconciliation (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020
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Segment Reporting [Abstract] |  |  |
Segment Assets | $ 38,148 | $ 36,850 | $ 39,108
Corporate Assets | 4,401 | 5,799 | 3,870
Total Assets | $ 42,549 | $ 42,649 | $ 42,978

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