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Employee Benefit Plans - Schedule of Amount Recognized in Balance Sheet (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Pension Benefits |  |
Amounts Recorded in Consolidated Balance Sheets [Abstract] |  |
Long-term Assets | $ 13 | $ 57
Current Liabilities | (16) | (15)
Long-term Liabilities | (324) | (211)
Net Amount Recognized in Consolidated Balance Sheets | (327) | (169)
Post-retirement Benefits |  |
Amounts Recorded in Consolidated Balance Sheets [Abstract] |  |
Long-term Assets | 0 | 0
Current Liabilities | (34) | (38)
Long-term Liabilities | (84) | (212)
Net Amount Recognized in Consolidated Balance Sheets | $ (118) | $ (250)

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