Related Party Transactions (Tables)

12 Months Ended

Dec. 31, 2016

Related Party Transactions [Abstract]

Schedule of Related Party Transactions [Table Text Block]

Summary of the related party transactions discussed in all sections above. 

	Years Ended December 31,
	2016		2015		2014
	(Millions)
Service revenues	$	31	$	—	$	—
Product costs	181		169		186
Operating and maintenance expenses - employee costs	470		498		413
Selling, general, and administrative expenses:
Employee direct costs	344		368		331
Employee allocated costs	160		195		171