Employee Benefit Plans - PacifiCorp - Funded Status (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	May 31, 2015
Domestic Pension Plans [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	$ 2,489	$ 2,718
Defined Benefit Plan, Contributions by Employer	78	13
Defined Benefit Plan, Contributions by Plan Participants	0	0
Defined Benefit Plan, Actual Return on Plan Assets	163	(17)
Defined Benefit Plan, Settlements, Plan Assets	11	(23)
Defined Benefit Plan, Benefits Paid	(194)	(202)
Ending balance	2,525	2,489	$ 2,718
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance	2,934	3,119
Defined Benefit Plan, Service Cost	29	33	36
Defined Benefit Plan, Interest Cost	126	121	131
Defined Benefit Plan, Contributions by Plan Participants	0	0
Defined Benefit Plan, Actuarial Gain (Loss)	67	(110)
Defined Benefit Plan, Settlements, Benefit Obligation	(11)	(23)
Defined Benefit Plan, Benefits Paid	(194)	(202)
Defined Benefit Plan, Benefit Obligation	2,934	3,119	3,119	$ 2,952	$ 2,934
Defined Benefit Plan, Accumulated Benefit Obligation				2,929	2,906
Defined Benefit Plan, Funded Status of Plan [Abstract]
Defined Benefit Plan, Funded Status of Plan				(427)	(445)
Other current liabilities				(15)	(15)
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent				(438)	(437)
Defined Benefit Plan, Amounts Recognized in Balance Sheet				(427)	(445)
Domestic Other Postretirement Plans [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	662	858
Defined Benefit Plan, Contributions by Employer	2	2
Defined Benefit Plan, Contributions by Plan Participants	10	9
Defined Benefit Plan, Actual Return on Plan Assets	41	0
Defined Benefit Plan, Settlements, Plan Assets	0	(150)
Defined Benefit Plan, Benefits Paid	(49)	(57)
Ending balance	666	662	858
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance	740	936
Defined Benefit Plan, Service Cost	9	11	14
Defined Benefit Plan, Interest Cost	31	31	46
Defined Benefit Plan, Contributions by Plan Participants	10	9
Defined Benefit Plan, Actuarial Gain (Loss)	(7)	(43)
Defined Benefit Plan, Settlements, Benefit Obligation	0	(150)
Defined Benefit Plan, Benefits Paid	(49)	(57)
Defined Benefit Plan, Benefit Obligation	740	936	936	734	740
Defined Benefit Plan, Funded Status of Plan [Abstract]
Defined Benefit Plan, Funded Status of Plan				(68)	(78)
Other current liabilities				0	0
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent				(87)	(93)
Defined Benefit Plan, Amounts Recognized in Balance Sheet				(68)	(78)
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plans, Supplemental Employee Retirement Plans [Abstract]
Life Insurance, Corporate or Bank Owned, Amount				242	228
PacifiCorp [Member] | Domestic Pension Plans [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	1,043	1,146
Defined Benefit Plan, Contributions by Employer	5	4
Defined Benefit Plan, Contributions by Plan Participants	0	0
Defined Benefit Plan, Actual Return on Plan Assets	51	0
Defined Benefit Plan, Settlements, Plan Assets	0	0
Defined Benefit Plan, Benefits Paid	(100)	(107)
Ending balance	999	1,043	1,146
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance	1,289	1,378
Defined Benefit Plan, Service Cost	4	4	5
Defined Benefit Plan, Interest Cost	54	53	57
Defined Benefit Plan, Contributions by Plan Participants	0	0
Defined Benefit Plan, Actuarial Gain (Loss)	29	(39)
Defined Benefit Plan, Settlements, Benefit Obligation	0	0
Defined Benefit Plan, Benefits Paid	(100)	(107)
Defined Benefit Plan, Benefit Obligation	1,289	1,378	1,378	1,276	1,289
Defined Benefit Plan, Accumulated Benefit Obligation				1,276	1,289
Defined Benefit Plan, Funded Status of Plan [Abstract]
Defined Benefit Plan, Funded Status of Plan				(277)	(246)
Other current liabilities				(5)	(4)
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent				(272)	(242)
Defined Benefit Plan, Amounts Recognized in Balance Sheet				(277)	(246)
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	305	482
Defined Benefit Plan, Contributions by Employer	1	1
Defined Benefit Plan, Contributions by Plan Participants	6	6
Defined Benefit Plan, Actual Return on Plan Assets	17	1
Defined Benefit Plan, Settlements, Plan Assets	0	(150)
Defined Benefit Plan, Benefits Paid	(27)	(35)
Ending balance	302	305	482
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance	362	539
Defined Benefit Plan, Service Cost	2	3	6
Defined Benefit Plan, Interest Cost	15	16	28
Defined Benefit Plan, Contributions by Plan Participants	6	6
Defined Benefit Plan, Actuarial Gain (Loss)	0	(17)
Defined Benefit Plan, Settlements, Benefit Obligation	0	(150)
Defined Benefit Plan, Benefits Paid	(27)	(35)
Defined Benefit Plan, Benefit Obligation	$ 362	$ 539	$ 539	358	362
Defined Benefit Plan, Amount To Be Transferred				150		$ 150
Defined Benefit Plan, Funded Status of Plan [Abstract]
Defined Benefit Plan, Funded Status of Plan				(56)	(57)
Other current liabilities				0	0
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent				(56)	(57)
Defined Benefit Plan, Amounts Recognized in Balance Sheet				(56)	(57)
PacifiCorp [Member] | Supplemental Employee Retirement Plan [Member]
Defined Benefit Plans, Supplemental Employee Retirement Plans [Abstract]
Life Insurance, Corporate or Bank Owned, Amount				$ 55	$ 52