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Other Financial Data - Other Assets (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Other Assets: |  |  |
Defined benefit plan assets | $ 98 | $ 164 |
Non-current contract cost assets | 119 | 130 | $ 124
Other | 57 | 16 |
Other assets | $ 274 | $ 310 |

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