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Supplemental Financial Information - Other Non-Current Liabilities (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
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Other Liabilities, Noncurrent [Abstract] |  |
Postretirement obligation | $ 240 | $ 232
Other deferred compensation | 282 | 247
Other | 117 | 171
Other noncurrent liabilities | $ 639 | $ 650

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