Accrued Liabilities (Tables)

12 Months Ended

Dec. 31, 2019

Accrued Liabilities, Current [Abstract]

Accrued Liabilities [Table Text Block]

	December 31,
	2019		2018
	(Millions)
Interest on debt	$	288	$	282
Employee costs	226		205
Estimated rate refund liabilities (Note 19)	189		—
Contract liabilities (Note 2)	158		244
Asset retirement obligation (Note 12)	48		64
Operating lease liabilities (Note 11)	21		—
Other, including other loss contingencies	346		307
	$	1,276	$	1,102