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Supplemental Financial Information - Other Non-Current Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Other Liabilities, Noncurrent [Abstract]    
Postretirement obligation $ 235 $ 232
Other deferred compensation 272 247
Other 101 171
Other noncurrent liabilities $ 608 $ 650