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Other Income and Expense - Other Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Schedule of other expense [Line Items] |  |  |  |  |  |
Gain (Loss) on Disposition of Assets |  |  |  |  | $ 40 | $ (16)
Other Nonoperating Expense | $ 158 |  | $ 0 |  | 202 | 0
Other Expenses | 3 |  | 14 |  | 7 | 26
Other Expense [Member] |  |  |  |  |  |
Schedule of other expense [Line Items] |  |  |  |  |  |
Gain (Loss) on Disposition of Assets | 1 | [1] | 9 | [1] | 2 | 14
Defined Benefit Plan, Other Cost (Credit) | 1 |  | 5 |  | 1 | 9
Other Nonoperating Expense | 1 |  | 0 |  | 4 | 3
Other Expenses | $ 3 |  | $ 14 |  | $ 7 | $ 26
[1] | Primarily associated with the gain on sale of Redondo Beach land at Southland. See Note 18—Held-for-Sale and Dispositions for further information.

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