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Segment Reporting Segment Asset Reconciliation (Details) - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018
Segment Reporting [Abstract] |  |  |  |
Document Period End Date |  | Sep. 30, 2019 |  |
Segment Assets |  | $ 39,352 | $ 38,632 | $ 39,388
Corporate Assets |  | 3,883 | 4,417 | 4,020
Total assets of discontinued operations | [1] | 0 | 65,634 | 66,240
Total Assets |  | $ 43,235 | $ 108,683 | $ 109,648
[1] | See Note 5 - Divestitures and Other Transactions for additional information on discontinued operations.

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