Employee Benefit Plans - Defined Contribution Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	May. 31, 2015
Defined Contribution Plan, Cost Recognized	$ 90	$ 83	$ 63
Domestic Other Postretirement Plans [Member]
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Regulatory Deferrals, Before Tax	(8)	$ (2)
Domestic Other Postretirement Plans [Member] | PacifiCorp [Member]
Defined Benefit Plan, Net Periodic Benefit Cost Not Yet Recognized, Regulatory Deferrals, Before Tax				$ 9
Defined Benefit Plan, Amount To Be Transferred	$ 150