Accrued Liabilities (Tables)

12 Months Ended

Dec. 31, 2020

Accrued Liabilities, Current [Abstract]

Accrued Liabilities [Table Text Block]

	December 31,
	2020		2019
	(Millions)
Interest on debt	$	271	$	288
Employee costs	149		226
Estimated rate refund liabilities	—		189
Contract liabilities (Note 5)	129		158
Asset retirement obligation (Note 11)	63		48
Operating lease liabilities (Note 15)	28		21
Other, including accrued loss contingencies	304		346
	$	944	$	1,276