Accrued Liabilities (Tables)

12 Months Ended

Dec. 31, 2018

Accrued Liabilities, Current [Abstract]

Accrued Liabilities [Table Text Block]

	December 31,
	2018		2017
	(Millions)
Interest on debt	$	282	$	267
Revenue contract liabilities (Note 2)	244		361
Employee costs	205		202
Other, including other loss contingencies	371		337
	$	1,102	$	1,167