Employee Benefit Plans - PacifiCorp - Level 3 Rollforward (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Domestic Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Beginning balance		$ 2,718		$ 2,711
Ending balance		2,489		2,718		$ 2,711
Domestic Pension Plans [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Beginning balance	[1]	110
Ending balance	[1]	112		110
Domestic Pension Plans [Member] | Limited Partnership Interests [Member]
Defined Benefit Plan Disclosure [Line Items]
Beginning balance	[2]	70
Ending balance	[2]	65		70
Domestic Pension Plans [Member] | Limited Partnership Interests [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Beginning balance		70	[1],[2]	86		96
Defined Benefit Plan, Actual Return on Plan Assets Still Held		5		(1)		16
Defined Benefit Plan, Purchases, Sales, and Settlements		(10)		(15)		(26)
Ending balance		65	[1],[2]	70	[1],[2]	86
Domestic Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Beginning balance		858		852
Ending balance		662		858		852
Domestic Other Postretirement Plans [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Beginning balance	[3]	5
Ending balance	[3]	4		5
Domestic Other Postretirement Plans [Member] | Limited Partnership Interests [Member]
Defined Benefit Plan Disclosure [Line Items]
Beginning balance	[4]	5
Ending balance	[4]	4		5
Domestic Other Postretirement Plans [Member] | Limited Partnership Interests [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Beginning balance		5	[3],[4]	6		7
Defined Benefit Plan, Actual Return on Plan Assets Still Held		0		0		1
Defined Benefit Plan, Purchases, Sales, and Settlements		(1)		(1)		(2)
Ending balance		4	[3],[4]	5	[3],[4]	6
PacifiCorp [Member] | Domestic Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Beginning balance		1,146		1,171
Ending balance		1,043		1,146		1,171
PacifiCorp [Member] | Domestic Pension Plans [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Beginning balance		70
Ending balance		65		70
PacifiCorp [Member] | Domestic Pension Plans [Member] | Limited Partnership Interests [Member]
Defined Benefit Plan Disclosure [Line Items]
Beginning balance		70
Ending balance		65		70
PacifiCorp [Member] | Domestic Pension Plans [Member] | Limited Partnership Interests [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Beginning balance		70		86		96
Defined Benefit Plan, Actual Return on Plan Assets Still Held		5		(1)		16
Defined Benefit Plan, Purchases, Sales, and Settlements		(10)		(15)		(26)
Ending balance		65		70		86
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Beginning balance		482		486
Ending balance		305		482		486
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Beginning balance		5
Ending balance		4		5
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | Limited Partnership Interests [Member]
Defined Benefit Plan Disclosure [Line Items]
Beginning balance		5
Ending balance		4		5
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member] | Limited Partnership Interests [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Beginning balance		5		6		7
Defined Benefit Plan, Actual Return on Plan Assets Still Held		0		0		1
Defined Benefit Plan, Purchases, Sales, and Settlements		(1)		(1)		(2)
Ending balance		$ 4		$ 5		$ 6

[1] Refer to Note 15 for additional discussion regarding the three levels of the fair value hierarchy.

[2] Limited partnership interests include several funds that invest primarily in real estate, buyout, growth equity and venture capital.

[3] Refer to Note 15 for additional discussion regarding the three levels of the fair value hierarchy.

[4] Limited partnership interests include several funds that invest primarily in real estate, buyout, growth equity and venture capital.