Accrued Liabilities Table (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Accrued Liabilities, Current [Abstract]
Interest on debt	$ 282	$ 267
Revenue contract liabilities (Note 2)	244	361
Employee costs	205	202
Other, including other loss contingencies	371	337
Other accrued liabilities	$ 1,102	$ 1,167