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Segment Reporting Segment Asset Reconciliation (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020
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Segment Reporting [Abstract] |  |  |
Segment Assets | $ 36,240 | $ 36,850 | $ 36,965
Corporate Assets | 4,882 | 5,799 | 4,725
Total Assets | $ 41,122 | $ 42,649 | $ 41,690

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