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Supplemental Financial Information - Other Non-Current Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Other Liabilities, Noncurrent [Abstract] |  |
Postretirement obligation | $ 288 | $ 232
Other deferred compensation | 313 | 247
Other | 105 | 171
Other non-current liabilities | $ 706 | $ 650

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