Related Party Transactions (Tables)

12 Months Ended

Dec. 31, 2015

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,
	2015		2014		2013
	(Millions)
Product costs	$	169	$	186	$	147
Operating and maintenance expenses - employee costs	498		413		339
Selling, general, and administrative expenses:
Employee direct costs	368		331		270
Employee allocated costs	195		171		169