Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

The following table presents the Company's assets and liabilities recognized on the Consolidated Balance Sheets and measured at fair value on a recurring basis (in millions):



	Input Levels for Fair Value Measurements
	Level 1			Level 2			Level 3			Other⁽¹⁾			Total
As of December 31, 2015
Assets:
Commodity derivatives	$	—		$	16		$	93		$	(16	)	$	93
Interest rate derivatives	—			5			5			—			10
Mortgage loans held for sale	—			327			—			—			327
Money market mutual funds⁽²⁾	421			—			—			—			421
Debt securities:
United States government obligations	133			—			—			—			133
International government obligations	—			2			—			—			2
Corporate obligations	—			39			—			—			39
Municipal obligations	—			1			—			—			1
Agency, asset and mortgage-backed obligations	—			3			—			—			3
Auction rate securities	—			—			44			—			44
Equity securities:
United States companies	239			—			—			—			239
International companies	1,244			—			—			—			1,244
Investment funds	136			—			—			—			136
	$	2,173		$	393		$	142		$	(16	)	$	2,692
Liabilities:
Commodity derivatives	$	(13	)	$	(283	)	$	(46	)	$	119		$	(223	)
Interest rate derivatives	—			(13		)	(1		)	—			(14		)
	$	(13	)	$	(296	)	$	(47	)	$	119		$	(237	)



As of December 31, 2014
Assets:
Commodity derivatives	$	1		$	48		$	94		$	(40	)	$	103
Interest rate derivatives	—			5			—			—			5
Mortgage loans held for sale	—			279			—			—			279
Money market mutual funds⁽²⁾	320			—			—			—			320
Debt securities:
United States government obligations	136			—			—			—			136
International government obligations	—			1			—			—			1
Corporate obligations	—			39			—			—			39
Municipal obligations	—			2			—			—			2
Agency, asset and mortgage-backed obligations	—			2			—			—			2
Auction rate securities	—			—			45			—			45
Equity securities:
United States companies	238			—			—			—			238
International companies	886			—			—			—			886
Investment funds	137			—			—			—			137
	$	1,718		$	376		$	139		$	(40	)	$	2,193
Liabilities:
Commodity derivatives	$	(18	)	$	(274	)	$	(43	)	$	115		$	(220	)
Interest rate derivatives	—			(10		)	—			—			(10		)
	$	(18	)	$	(284	)	$	(43	)	$	115		$	(230	)


(1)	Represents netting under master netting arrangements and a net cash collateral receivable of $103 million and $75 million as of December 31, 2015 and 2014, respectively.


(2)	Amounts are included in cash and cash equivalents; other current assets; and noncurrent investments and restricted cash and investments on the Consolidated Balance Sheets. The fair value of these money market mutual funds approximates cost.

PacifiCorp [Member]

Changes in Fair Value of Plan Assets [Table Text Block]

Net periodic benefit cost for the plans included the following components for the years ended December 31 (in millions):



	Pension									Other Postretirement
	2015			2014			2013			2015			2014			2013

Service cost	$	4		$	5		$	6		$	3		$	6		$	9
Interest cost	53			57			54			16			28			25
Expected return on plan assets	(77		)	(76		)	(74		)	(23		)	(31		)	(30		)
Net amortization	42			29			48			(4		)	2			8
Net periodic benefit cost (credit)	$	22		$	15		$	34		$	(8	)	$	5		$	12

The following table is a reconciliation of the fair value of plan assets for the years ended December 31 (in millions):



	Pension						Other Postretirement
	2015			2014			2015			2014

Plan assets at fair value, beginning of year	$	1,146		$	1,171		$	482		$	486
Employer contributions	4			10			1			1
Participant contributions	—			—			6			7
Actual return on plan assets	—			53			1			25
Settlement	—			—			(150		)	—
Benefits paid	(107		)	(88		)	(35		)	(37		)
Plan assets at fair value, end of year	$	1,043		$	1,146		$	305		$	482

Changes in Projected Benefit Obligations [Table Text Block]

The following table is a reconciliation of the benefit obligations for the years ended December 31 (in millions):



	Pension						Other Postretirement
	2015			2014			2015			2014

Benefit obligation, beginning of year	$	1,378		$	1,230		$	539		$	598
Service cost	4			5			3			6
Interest cost	53			57			16			28
Participant contributions	—			—			6			7
Actuarial (gain) loss	(39		)	174			(17		)	(63		)
Settlement	—			—			(150		)	—
Benefits paid	(107		)	(88		)	(35		)	(37		)
Benefit obligation, end of year	$	1,289		$	1,378		$	362		$	539
Accumulated benefit obligation, end of year	$	1,289		$	1,378

Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]

The funded status of the plans and the amounts recognized on the Consolidated Balance Sheets as of December 31 are as follows (in millions):



	Pension						Other Postretirement
	2015			2014			2015			2014

Plan assets at fair value, end of year	$	1,043		$	1,146		$	305		$	482
Less - Benefit obligation, end of year	1,289			1,378			362			539
Funded status	$	(246	)	$	(232	)	$	(57	)	$	(57	)

Amounts recognized on the Consolidated Balance Sheets:
Other current liabilities	$	(4	)	$	(4	)	$	—		$	—
Other long-term liabilities	(242		)	(228		)	(57		)	(57		)
Amounts recognized	$	(246	)	$	(232	)	$	(57	)	$	(57	)

Net Periodic Benefit Costs Not Yet Recognized [Table Text Block]

The portion of the funded status of the plans not yet recognized in net periodic benefit cost as of December 31 is as follows (in millions):



	Pension						Other Postretirement
	2015			2014			2015			2014

Net loss	$	508		$	520		$	36		$	41
Prior service credit	(13		)	(21		)	(19		)	(26		)
Regulatory deferrals	(3		)	(3		)	9			2
Total	$	492		$	496		$	26		$	17

A reconciliation of the amounts not yet recognized as components of net periodic benefit cost for the years ended December 31, 2015 and 2014 is as follows (in millions):



				Accumulated
				Other
	Regulatory			Comprehensive
	Asset			Loss			Total
Pension
Balance, December 31, 2013	$	313		$	15		$	328
Net loss arising during the year	189			8			197
Net amortization	(28		)	(1		)	(29		)
Total	161			7			168
Balance, December 31, 2014	474			22			496
Net loss (gain) arising during the year	40			(2		)	38
Net amortization	(41		)	(1		)	(42		)
Total	(1		)	(3		)	(4		)
Balance, December 31, 2015	$	473		$	19		$	492



	Regulatory
	Asset
Other Postretirement
Balance, December 31, 2013	$	77
Net gain arising during the year	(58		)
Net amortization	(2		)
Total	(60		)
Balance, December 31, 2014	17
Net loss arising during the year	5
Net amortization	4
Total	9
Balance, December 31, 2015	$	26

Defined Benefit Plans, Amounts To Be Recognized In Following Year [Table Text Block]

The net loss, prior service credit and regulatory deferrals that will be amortized in 2016 into net periodic benefit cost are estimated to be as follows (in millions):



	Net		Prior Service			Regulatory
	Loss		Credit			Deferrals			Total

Pension	$	42	$	(8	)	$	(1	)	$	33
Other postretirement	1		(7		)	1			(5		)
Total	$	43	$	(15	)	$	—		$	28

Assumptions used to determine benefit obligations and net periodic benefit cost were as follows:



	Pension						Other Postretirement
	2015		2014		2013		2015		2014		2013

Benefit obligations as of December 31:
Discount rate	4.40	%	4.00	%	4.80	%	4.35	%	3.90	%	4.90	%
Rate of compensation increase	2.75		2.75		3.00		N/A		N/A		N/A

Net periodic benefit cost for the years ended December 31:
Discount rate	4.00	%	4.80	%	4.05	%	3.99	%	4.90	%	4.10	%
Expected return on plan assets	7.50		7.50		7.50		7.08		7.50		7.50
Rate of compensation increase	2.75		3.00		3.00		N/A		N/A		N/A

In establishing its assumption as to the expected return on plan assets, PacifiCorp utilizes the asset allocation and return assumptions for each asset class based on historical performance and forward-looking views of the financial markets. As discussed above in "Utah Mine Disposition and Labor Agreement," PacifiCorp remeasured the other postretirement plan assets and benefit obligation as of May 31, 2015. The other postretirement assumptions for the year ended December 31, 2015 presented above reflect a weighted average calculation that considered the assumptions used in the periods preceding and subsequent to the remeasurement.

As a result of the labor settlement discussed above in "Utah Mine Disposition and Labor Agreement," the benefit obligation for the other postretirement plan is no longer affected by healthcare cost trends. The assumed healthcare cost trend rates used to determine the benefit obligation as of December 31, 2014 were as follows:



Healthcare cost trend rate assumed for next year	8.00	%
Rate that the cost trend rate gradually declines to	5.00	%
Year that the rate reaches the rate it is assumed to remain at	2025

The expected benefit payments to participants in PacifiCorp's pension and other postretirement benefit plans for 2016 through 2020 and for the five years thereafter are summarized below (in millions):



	Projected Benefit Payments
	Pension		Other Postretirement

2016	$	108	$	28
2017	110		28
2018	108		28
2019	109		27
2020	107		30
2021-2025	448		122

Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

The target allocations (percentage of plan assets) for PacifiCorp's pension and other postretirement benefit plan assets are as follows as of December 31, 2015:



	Pension⁽¹⁾	Other Postretirement⁽¹⁾
	%	%
Debt securities⁽²⁾	33 - 37	33 - 37
Equity securities⁽²⁾	53 - 57	61 - 65
Limited partnership interests	8 - 12	1 - 3
Other	0 - 1	0 - 1

(1)

PacifiCorp's Retirement Plan trust includes a separate account that is used to fund benefits for the other postretirement benefit plan. In addition to this separate account, the assets for the other postretirement benefit plan are held in Voluntary Employees' Beneficiary Association ("VEBA") trusts, each of which has its own investment allocation strategies. Target allocations for the other postretirement benefit plan include the separate account of the Retirement Plan trust and the VEBA trusts.


(2)	For purposes of target allocation percentages and consistent with the plans' investment policy, investment funds are allocated based on the underlying investments in debt and equity securities.

The following table presents the fair value of plan assets, by major category, for PacifiCorp's defined benefit pension plan (in millions):



	Input Levels for Fair Value Measurements
	Level 1⁽¹⁾		Level 2⁽¹⁾		Level 3⁽¹⁾		Total
As of December 31, 2015
Cash equivalents	$	—	$	10	$	—	$	10
Debt securities:
United States government obligations	19		—		—		19
Corporate obligations	—		42		—		42
Municipal obligations	—		5		—		5
Agency, asset and mortgage-backed obligations	—		43		—		43
Equity securities:
United States companies	408		—		—		408
International companies	17		—		—		17
Investment funds⁽²⁾	83		351		—		434
Limited partnership interests⁽³⁾	—		—		65		65
Total	$	527	$	451	$	65	$	1,043

As of December 31, 2014
Cash equivalents	$	—	$	8	$	—	$	8
Debt securities:
United States government obligations	15		—		—		15
Corporate obligations	—		53		—		53
Municipal obligations	—		8		—		8
Agency, asset and mortgage-backed obligations	—		48		—		48
Equity securities:
United States companies	488		—		—		488
International companies	16		—		—		16
Investment funds⁽²⁾	217		223		—		440
Limited partnership interests⁽³⁾	—		—		70		70
Total	$	736	$	340	$	70	$	1,146


(1)	Refer to Note 12 for additional discussion regarding the three levels of the fair value hierarchy.


(2)	Investment funds are substantially comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 53% and 47%, respectively, for 2015 and 50% and 50%, respectively, for 2014, and are invested in United States and international securities of approximately 40% and 60%, respectively, for 2015 and 43% and 57%, respectively, for 2014.


(3)	Limited partnership interests include several funds that invest primarily in real estate, buyout, growth equity and venture capital.

The following table presents the fair value of plan assets, by major category, for PacifiCorp's defined benefit other postretirement plan (in millions):



	Input Levels for Fair Value Measurements
	Level 1⁽¹⁾		Level 2⁽¹⁾		Level 3⁽¹⁾		Total
As of December 31, 2015
Cash and cash equivalents	$	4	$	1	$	—	$	5
Debt securities:
United States government obligations	9		—		—		9
Corporate obligations	—		15		—		15
Municipal obligations	—		1		—		1
Agency, asset and mortgage-backed obligations	—		14		—		14
Equity securities:
United States companies	95		—		—		95
International companies	4		—		—		4
Investment funds⁽²⁾	32		126		—		158
Limited partnership interests⁽³⁾	—		—		4		4
Total	$	144	$	157	$	4	$	305

As of December 31, 2014
Cash and cash equivalents⁽⁴⁾	$	139	$	—	$	—	$	139
Debt securities:
United States government obligations	8		—		—		8
Corporate obligations	—		18		—		18
Municipal obligations	—		2		—		2
Agency, asset and mortgage-backed obligations	—		16		—		16
Equity securities:
United States companies	112		—		—		112
International companies	4		—		—		4
Investment funds⁽²⁾	84		94		—		178
Limited partnership interests⁽³⁾	—		—		5		5
Total	$	347	$	130	$	5	$	482


(1)	Refer to Note 12 for additional discussion regarding the three levels of the fair value hierarchy.


(2)	Investment funds are substantially comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 61% and 39%, respectively, for 2015 and 63% and 37%, respectively, for 2014, and are invested in United States and international securities of approximately 67% and 33%, respectively, for 2015 and 64% and 36%, respectively, for 2014.


(3)	Limited partnership interests include several funds that invest primarily in real estate, buyout, growth equity and venture capital.


(4)	In December 2014, PacifiCorp began to migrate funds to cash and cash equivalents in anticipation of the $150 million to be transferred to a fund managed by the UMWA in May 2015 as a result of the other postretirement settlement. Remaining investments were rebalanced to align to target investment allocations.

The following table presents PacifiCorp's assets and liabilities recognized on the Consolidated Balance Sheets and measured at fair value on a recurring basis (in millions):



	Input Levels for Fair Value Measurements
	Level 1		Level 2			Level 3		Other⁽¹⁾			Total
As of December 31, 2015
Assets:
Commodity derivatives	$	—	$	9		$	3	$	(3	)	$	9
Money market mutual funds⁽²⁾	13		—			—		—			13
Investment funds	15		—			—		—			15
	$	28	$	9		$	3	$	(3	)	$	37

Liabilities - Commodity derivatives	$	—	$	(148	)	$	—	$	78		$	(70	)

As of December 31, 2014
Assets:
Commodity derivatives	$	—	$	25		$	4	$	(11	)	$	18
Money market mutual funds⁽²⁾	30		—			—		—			30
	$	30	$	25		$	4	$	(11	)	$	48

Liabilities - Commodity derivatives	$	—	$	(114	)	$	—	$	39		$	(75	)


(1)	Represents netting under master netting arrangements and a net cash collateral receivable of $75 million and $28 million as of December 31, 2015 and 2014, respectively.


(2)	Amounts are included in cash and cash equivalents, other current assets and other assets on the Consolidated Balance Sheets. Money market mutual funds are accounted for as available-for-sale securities and the fair value approximates cost.

Level Three Defined Benefit Plan Assets Roll Forward [Table Text Block]

The following table reconciles the beginning and ending balances of PacifiCorp's plan assets measured at fair value using significant Level 3 inputs for the years ended December 31 (in millions):



	Limited Partnership Interests
	Pension			Other Postretirement

Balance, December 31, 2012	$	96		$	7
Actual return on plan assets still held at December 31, 2013	16			1
Purchases, sales, distributions and settlements	(26		)	(2		)
Balance, December 31, 2013	86			6
Actual return on plan assets still held at December 31, 2014	(1		)	—
Purchases, sales, distributions and settlements	(15		)	(1		)
Balance, December 31, 2014	70			5
Actual return on plan assets still held at December 31, 2015	5			—
Purchases, sales, distributions and settlements	(10		)	(1		)
Balance, December 31, 2015	$	65		$	4

Schedule of Multiemployer Plans [Table Text Block]

The following table presents PacifiCorp's and Energy West Mining Company's participation in individually significant joint trustee and multiemployer pension plans for the years ended December 31 (dollars in millions):



		PPA zone status or
		plan funded status percentage for
		plan years beginning July 1,					Contributions⁽¹⁾
Plan name	Employer Identification Number	2015	2014	2013	Funding improvement plan	Surcharge imposed under PPA⁽¹⁾	2015		2014		2013		Year contributions to plan exceeded more than 5% of total contributions⁽²⁾
UMWA 1974 Pension Plan	52-1050282	Critical and Declining	Critical	Seriously Endangered	Implemented	Yes	$	1	$	2	$	3	None
Local 57 Trust Fund	87-0640888	At least 80%	At least 80%	At least 80%	None	None	$	8	$	9	$	9	2014, 2013, 2012

(1)

PacifiCorp's and Energy West Mining Company's minimum contributions to the plans are based on the amount of wages paid to employees covered by the Local 57 Trust Fund collective bargaining agreements and the number of mining hours worked for the UMWA 1974 Pension Plan, respectively, subject to ERISA minimum funding requirements. As a result of the plan's critical status, Energy West Mining Company was required to begin paying a surcharge for hours worked on and after December 1, 2014.


(2)	For the UMWA 1974 Pension Plan, information is for plan years beginning July 1, 2013 and 2012. Information for the plan years beginning July 1, 2015 and 2014 is not yet available. For the Local 57 Trust Fund, information is for plan years beginning July 1, 2014, 2013 and 2012. Information for the plan year beginning July 1, 2015 is not yet available.

MidAmerican Energy Company [Member]

Changes in Fair Value of Plan Assets [Table Text Block]

Net periodic benefit cost for the plans of MidAmerican Energy and the aforementioned affiliates included the following components for the years ended December 31 (in millions):



	Pension									Other Postretirement
	2015			2014			2013			2015			2014			2013

Service cost	$	12		$	14		$	18		$	7		$	6		$	5
Interest cost	32			35			33			9			10			8
Expected return on plan assets	(46		)	(45		)	(45		)	(15		)	(15		)	(13		)
Net amortization	2			1			11			(3		)	(3		)	(3		)
Net periodic benefit cost (credit)	$	—		$	5		$	17		$	(2	)	$	(2	)	$	(3	)

The following table is a reconciliation of the fair value of plan assets for the years ended December 31 (in millions):



	Pension						Other Postretirement
	2015			2014			2015			2014

Plan assets at fair value, beginning of year	$	730		$	722		$	259		$	256
Employer contributions	7			7			1			1
Participant contributions	—			—			1			1
Actual return on plan assets	4			52			—			13
Benefits paid	(63		)	(51		)	(12		)	(12		)
Plan assets at fair value, end of year	$	678		$	730		$	249		$	259

Changes in Projected Benefit Obligations [Table Text Block]

The following table is a reconciliation of the benefit obligations for the years ended December 31 (in millions):



	Pension						Other Postretirement
	2015			2014			2015			2014

Benefit obligation, beginning of year	$	840		$	768		$	249		$	235
Service cost	12			14			7			6
Interest cost	32			35			9			10
Participant contributions	—			—			1			1
Actuarial (gain) loss	(36		)	74			(20		)	9
Benefits paid	(63		)	(51		)	(12		)	(12		)
Benefit obligation, end of year	$	785		$	840		$	234		$	249
Accumulated benefit obligation, end of year	$	773		$	825

Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]

The funded status of the plans and the amounts recognized on the Balance Sheets as of December 31 are as follows (in millions):



	Pension						Other Postretirement
	2015			2014			2015		2014

Plan assets at fair value, end of year	$	678		$	730		$	249	$	259
Less - Benefit obligation, end of year	785			840			234		249
Funded status	$	(107	)	$	(110	)	$	15	$	10

Amounts recognized on the Balance Sheets:
Other assets	$	7		$	12		$	15	$	10
Other current liabilities	(8		)	(8		)	—		—
Other liabilities	(106		)	(114		)	—		—
Amounts recognized	$	(107	)	$	(110	)	$	15	$	10

Net Periodic Benefit Costs Not Yet Recognized [Table Text Block]

The portion of the funded status of the plans not yet recognized in net periodic benefit cost as of December 31 is as follows (in millions):



	Pension				Other Postretirement
	2015		2014		2015			2014

Net loss	$	26	$	21	$	42		$	49
Prior service cost (credit)	2		3		(36		)	(42		)
Total	$	28	$	24	$	6		$	7

A reconciliation of the amounts not yet recognized as components of net periodic benefit cost for the years ended December 31, 2015 and 2014 is as follows (in millions):



	Regulatory Asset			Regulatory Liability			Receivables (Payables) with Affiliates			Total
Pension
Balance, December 31, 2013	$	16		$	(55	)	$	(2	)	$	(41	)
Net loss arising during the year	6			51			9			66
Net amortization	—			(1		)	—			(1		)
Total	6			50			9			65
Balance, December 31, 2014	22			(5		)	7			24
Net loss (gain) arising during the year	2			5			(1		)	6
Net amortization	(2		)	—			—			(2		)
Total	—			5			(1		)	4
Balance, December 31, 2015	$	22		$	—		$	6		$	28



	Regulatory Asset			Regulatory Liability		Receivables (Payables) with Affiliates			Total
Other Postretirement
Balance, December 31, 2013	$	10		$	—	$	(16	)	$	(6	)
Net loss arising during the year	8			—		2			10
Net amortization	2			—		1			3
Total	10			—		3			13
Balance, December 31, 2014	20			—		(13		)	7
Net gain arising during the year	(5		)	—		—			(5		)
Net amortization	2			—		2			4
Total	(3		)	—		2			(1		)
Balance, December 31, 2015	$	17		$	—	$	(11	)	$	6

Defined Benefit Plans, Amounts To Be Recognized In Following Year [Table Text Block]

The net loss and prior service cost (credit) that will be amortized in 2016 into net periodic benefit cost are estimated to be as follows (in millions):



	Net Loss		Prior Service Cost (Credit)			Total

Pension	$	1	$	1		$	2
Other postretirement	2		(6		)	(4		)
Total	$	3	$	(5	)	$	(2	)

Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block]

Assumptions used to determine benefit obligations and net periodic benefit cost were as follows:



	Pension						Other Postretirement
	2015		2014		2013		2015		2014		2013
Benefit obligations as of December 31:
Discount rate	4.50	%	4.00	%	4.75	%	4.25	%	3.75	%	4.50	%
Rate of compensation increase	2.75	%	2.75	%	3.00	%	N/A		N/A		N/A

Net periodic benefit cost for the years ended December 31:
Discount rate	4.00	%	4.75	%	4.00	%	3.75	%	4.50	%	3.75	%
Expected return on plan assets⁽¹⁾	7.25	%	7.50	%	7.50	%	7.00	%	7.25	%	7.25	%
Rate of compensation increase	2.75	%	3.00	%	3.00	%	N/A		N/A		N/A


(1)	Amounts reflected are pre-tax values. Assumed after-tax returns for a taxable, non-union other postretirement plan were 5.18% for 2015, and 5.37% for 2014, and 5.56% for 2013.

In establishing its assumption as to the expected return on plan assets, MidAmerican Energy utilizes the asset allocation and return assumptions for each asset class based on historical performance and forward-looking views of the financial markets.



	2015		2014
Assumed healthcare cost trend rates as of December 31:
Healthcare cost trend rate assumed for next year	7.70	%	8.00	%
Rate that the cost trend rate gradually declines to	5.00	%	5.00	%
Year that the rate reaches the rate it is assumed to remain at	2025		2025

A one percentage-point change in assumed healthcare cost trend rates would have the following effects (in millions):



	One Percentage-Point
	Increase		Decrease
Increase (decrease) in:
Total service and interest cost for the year ended December 31, 2015	$	1	$	—
Other postretirement benefit obligation as of December 31, 2015	3		(3		)

Net periodic benefit costs assigned to MidAmerican Energy affiliates are reimbursed currently in accordance with its intercompany administrative services agreement. The expected benefit payments to participants in MidAmerican Energy's pension and other postretirement benefit plans for 2016 through 2020 and for the five years thereafter are summarized below (in millions):



	Projected Benefit Payments
	Pension		Other Postretirement

2016	$	59	$	17
2017	60		19
2018	60		20
2019	60		21
2020	61		21
2021-2025	291		102

Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

The target allocations (percentage of plan assets) for MidAmerican Energy's pension and other postretirement benefit plan assets are as follows as of December 31, 2015:



	Pension	Other Postretirement
	%	%
Debt securities⁽¹⁾	20-40	25-45
Equity securities⁽¹⁾	60-80	50-80
Real estate funds	2-8	—
Other	0-5	0-5


(1)	For purposes of target allocation percentages and consistent with the plans' investment policy, investment funds are allocated based on the underlying investments in debt and equity securities.

The following table presents the fair value of plan assets, by major category, for MidAmerican Energy's defined benefit pension plan (in millions):



	Input Levels for Fair Value Measurements⁽¹⁾
	Level 1		Level 2		Level 3		Total
As of December 31, 2015
Cash equivalents	$	—	$	16	$	—	$	16
Debt securities:
United States government obligations	5		—		—		5
Corporate obligations	—		57		—		57
Municipal obligations	—		6		—		6
Agency, asset and mortgage-backed obligations	—		27		—		27
Equity securities:
United States companies	130		—		—		130
International equity securities	40		—		—		40
Investment funds⁽²⁾	61		289		—		350
Real estate funds	—		—		47		47
Total	$	236	$	395	$	47	$	678

As of December 31, 2014
Cash equivalents	$	—	$	24	$	—	$	24
Debt securities:
United States government obligations	8		—		—		8
Corporate obligations	—		29		—		29
Municipal obligations	—		4		—		4
Agency, asset and mortgage-backed obligations	—		33		—		33
Equity securities:
United States companies	149		—		—		149
International equity securities	40		—		—		40
Investment funds⁽²⁾	84		319		—		403
Real estate funds	—		—		40		40
Total	$	281	$	409	$	40	$	730


(1)	Refer to Note 13 for additional discussion regarding the three levels of the fair value hierarchy.


(2)	Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 72% and 28%, respectively, for 2015 and 68% and 32%, respectively, for 2014. Additionally, these funds are invested in United States and international securities of approximately 73% and 27%, respectively, for 2015 and 74% and 26%, respectively, for 2014.

The following table presents the fair value of plan assets, by major category, for MidAmerican Energy's defined benefit other postretirement plans (in millions):



	Input Levels for Fair Value Measurements⁽¹⁾
	Level 1		Level 2		Level 3		Total
As of December 31, 2015
Cash equivalents	$	5	$	—	$	—	$	5
Debt securities:
United States government obligations	5		—		—		5
Corporate obligations	—		12		—		12
Municipal obligations	—		39		—		39
Agency, asset and mortgage-backed obligations	—		12		—		12
Equity securities:
United States companies	120		—		—		120
Investment funds⁽²⁾	56		—		—		56
Total	$	186	$	63	$	—	$	249

As of December 31, 2014
Cash equivalents	$	4	$	—	$	—	$	4
Debt securities:
United States government obligations	5		—		—		5
Corporate obligations	—		11		—		11
Municipal obligations	—		40		—		40
Agency, asset and mortgage-backed obligations	—		15		—		15
Equity securities:
United States companies	128		—		—		128
Investment funds⁽²⁾	56		—		—		56
Total	$	193	$	66	$	—	$	259


(1)	Refer to Note 13 for additional discussion regarding the three levels of the fair value hierarchy.


(2)	Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 68% and 32%, respectively, for 2015 and 69% and 31%, respectively, for 2014. Additionally, these funds are invested in United States and international securities of approximately 32% and 68%, respectively, for 2015 and 31% and 69%, respectively, for 2014.

The following table presents MidAmerican Energy's assets and liabilities recognized on the Balance Sheets and measured at fair value on a recurring basis (in millions):



	Input Levels for Fair Value Measurements
	Level 1			Level 2			Level 3			Other⁽¹⁾			Total
As of December 31, 2015:
Assets:
Commodity derivatives	$	—		$	8		$	18		$	(13	)	$	13
Money market mutual funds⁽²⁾	56			—			—			—			56
Debt securities:
United States government obligations	133			—			—			—			133
International government obligations	—			2			—			—			2
Corporate obligations	—			39			—			—			39
Municipal obligations	—			1			—			—			1
Agency, asset and mortgage-backed obligations	—			3			—			—			3
Auction rate securities	—			—			26			—			26
Equity securities:
United States companies	239			—			—			—			239
International companies	6			—			—			—			6
Investment funds	4			—			—			—			4
	$	438		$	53		$	44		$	(13	)	$	522

Liabilities - commodity derivatives	$	(13	)	$	(61	)	$	(24	)	$	41		$	(57	)

As of December 31, 2014:
Assets:
Commodity derivatives	$	1		$	18		$	24		$	(26	)	$	17
Money market mutual funds⁽²⁾	1			—			—			—			1
Debt securities:
United States government obligations	136			—			—			—			136
International government obligations	—			1			—			—			1
Corporate obligations	—			39			—			—			39
Municipal obligations	—			2			—			—			2
Agency, asset and mortgage-backed obligations	—			2			—			—			2
Auction rate securities	—			—			26			—			26
Equity securities:
United States companies	238			—			—			—			238
International companies	5			—			—			—			5
	$	381		$	62		$	50		$	(26	)	$	467

Liabilities - commodity derivatives	$	(18	)	$	(87	)	$	(12	)	$	73		$	(44	)


(1)	Represents netting under master netting arrangements and a net cash collateral receivable of $28 million and $47 million as of December 31, 2015 and 2014, respectively.


(2)	Amounts are included in cash and cash equivalents and investments and restricted cash and investments on the Balance Sheets. The fair value of these money market mutual funds approximates cost.

Level Three Defined Benefit Plan Assets Roll Forward [Table Text Block]

The following table reconciles the beginning and ending balances of MidAmerican Energy's pension plan assets measured at fair value using significant Level 3 inputs for the years ended December 31, (in millions):



	Real Estate Funds
	2015		2014		2013

Beginning balance	$	40	$	31	$	26
Actual return on plan assets still held at period end	7		4		5
Purchases and sales	—		5		—
Ending balance	$	47	$	40	$	31

MidAmerican Funding, LLC and Subsidiaries [Domain]

United States Pension Plan of US Entity [Member]

Pension and postretirement costs allocated by MidAmerican Funding to its parent and other affiliates in each of the years ended December 31, were as follows (in millions):



	2015			2014			2013

Pension costs	$	4		$	4		$	6
Other postretirement costs	(2		)	(2		)	(2		)

Changes in Fair Value of Plan Assets [Table Text Block]

Net periodic benefit cost for the plans included the following components for the years ended December 31 (in millions):



	Pension									Other Postretirement
	2015			2014			2013			2015			2014			2013

Service cost	$	33		$	36		$	24		$	11		$	14		$	14
Interest cost	121			131			87			31			46			33
Expected return on plan assets	(169		)	(164		)	(119		)	(45		)	(53		)	(44		)
Net amortization	53			44			58			(11		)	(3		)	6
Net periodic benefit cost (credit)	$	38		$	47		$	50		$	(14	)	$	4		$	9

The following table is a reconciliation of the fair value of plan assets for the years ended December 31 (in millions):



	Pension						Other Postretirement
	2015			2014			2015			2014

Plan assets at fair value, beginning of year	$	2,718		$	2,711		$	858		$	852
Employer contributions	13			37			2			2
Participant contributions	—			—			9			11
Actual return on plan assets	(17		)	188			—			54
Settlement	(23		)	—			(150		)	—
Benefits paid	(202		)	(218		)	(57		)	(61		)
Plan assets at fair value, end of year	$	2,489		$	2,718		$	662		$	858

Changes in Projected Benefit Obligations [Table Text Block]

The following table is a reconciliation of the benefit obligations for the years ended December 31 (in millions):



	Pension						Other Postretirement
	2015			2014			2015			2014

Benefit obligation, beginning of year	$	3,119		$	2,821		$	936		$	987
Service cost	33			36			11			14
Interest cost	121			131			31			46
Participant contributions	—			—			9			11
Actuarial loss (gain)	(110		)	349			(43		)	(61		)
Amendment	(4		)	—			3			—
Settlement	(23		)	—			(150		)	—
Benefits paid	(202		)	(218		)	(57		)	(61		)
Benefit obligation, end of year	$	2,934		$	3,119		$	740		$	936
Accumulated benefit obligation, end of year	$	2,906		$	3,086

Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]

The fair value of plan assets, projected benefit obligation and accumulated benefit obligation for (1) pension and other postretirement benefit plans with a projected benefit obligation in excess of the fair value of plan assets and (2) pension plans with an accumulated benefit obligation in excess of the fair value of plan assets as of December 31 are as follows (in millions):



	Pension				Other Postretirement
	2015		2014		2015		2014

Fair value of plan assets	$	1,811	$	1,987	$	413	$	598

Projected benefit obligation	$	2,263	$	2,401	$	505	$	686

Accumulated benefit obligation	$	2,244	$	2,380

The funded status of the plans and the amounts recognized on the Consolidated Balance Sheets as of December 31 are as follows (in millions):



	Pension						Other Postretirement
	2015			2014			2015			2014

Plan assets at fair value, end of year	$	2,489		$	2,718		$	662		$	858
Benefit obligation, end of year	2,934			3,119			740			936
Funded status	$	(445	)	$	(401	)	$	(78	)	$	(78	)

Amounts recognized on the Consolidated Balance Sheets:
Other assets	$	7		$	12		$	15		$	10
Other current liabilities	(15		)	(14		)	—			—
Other long-term liabilities	(437		)	(399		)	(93		)	(88		)
Amounts recognized	$	(445	)	$	(401	)	$	(78	)	$	(78	)

Net Periodic Benefit Costs Not Yet Recognized [Table Text Block]

The portion of the funded status of the plans not yet recognized in net periodic benefit cost as of December 31 is as follows (in millions):



	Pension						Other Postretirement
	2015			2014			2015			2014

Net loss	$	768		$	757		$	97		$	108
Prior service credit	(25		)	(31		)	(68		)	(87		)
Regulatory deferrals	(2		)	(3		)	8			2
Total	$	741		$	723		$	37		$	23

A reconciliation of the amounts not yet recognized as components of net periodic benefit cost for the years ended December 31, 2015 and 2014 is as follows (in millions):



							Accumulated
							Other
	Regulatory			Regulatory			Comprehensive
	Asset			Liability			Loss			Total
Pension
Balance, December 31, 2013	$	490		$	(58	)	$	9		$	441
Net loss arising during the year	258			52			16			326
Net amortization	(38		)	—			(6		)	(44		)
Total	220			52			10			282
Balance, December 31, 2014	710			(6		)	19			723
Net loss (gain) arising during the year	76			5			(6		)	75
Net prior service credit arising during the year	(4		)	—			—			(4		)
Net amortization	(53		)	—			—			(53		)
Total	19			5			(6		)	18
Balance, December 31, 2015	$	729		$	(1	)	$	13		$	741



	Regulatory			Regulatory
	Asset			Liability			Total
Other Postretirement
Balance, December 31, 2013	$	99		$	(16	)	$	83
Net (gain) loss arising during the year	(64		)	1			(63		)
Net amortization	2			1			3
Total	(62		)	2			(60		)
Balance, December 31, 2014	37			(14		)	23
Net (gain) loss arising during the year	(1		)	1			—
Net prior service cost arising during the year	3			—			3
Net amortization	10			1			11
Total	12			2			14
Balance, December 31, 2015	$	49		$	(12	)	$	37

Defined Benefit Plans, Amounts To Be Recognized In Following Year [Table Text Block]

The net loss, prior service credit and regulatory deferrals that will be amortized in 2016 into net periodic benefit cost are estimated to be as follows (in millions):



	Net		Prior Service			Regulatory
	Loss		Credit			Deferrals			Total

Pension	$	58	$	(11	)	$	(1	)	$	46
Other postretirement	3		(16		)	1			(12		)
Total	$	61	$	(27	)	$	—		$	34

Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block]

In establishing its assumption as to the expected return on plan assets, the Company utilizes the asset allocation and return assumptions for each asset class based on historical performance and forward-looking views of the financial markets.



	2015		2014
Assumed healthcare cost trend rates as of December 31:
Healthcare cost trend rate assumed for next year	7.70	%	8.00	%
Rate that the cost trend rate gradually declines to	5.00	%	5.00	%
Year that the rate reaches the rate it is assumed to remain at	2025		2025

Weighted-average assumptions used to determine benefit obligations and net periodic benefit cost were as follows:



	Pension						Other Postretirement
	2015		2014		2013		2015		2014		2013

Benefit obligations as of December 31:
Discount rate	4.43	%	4.00	%	4.81	%	4.33	%	3.88	%	4.82	%
Rate of compensation increase	2.75	%	2.75	%	3.00	%	N/A		N/A		N/A

Net periodic benefit cost for the years ended December 31:
Discount rate	4.00	%	4.81	%	4.03	%	3.93	%	4.82	%	4.01	%
Expected return on plan assets	6.88	%	6.86	%	7.50	%	7.00	%	7.34	%	7.44	%
Rate of compensation increase	2.75	%	3.00	%	3.00	%	N/A		N/A		N/A

A one percentage-point change in assumed healthcare cost trend rates would have the following effects (in millions):



	One Percentage-Point
	Increase		Decrease
Increase (decrease) in:
Total service and interest cost for the year ended December 31, 2015	$	1	$	(1	)
Other postretirement benefit obligation as of December 31, 2015	5		(5		)

The expected benefit payments to participants in the Company's pension and other postretirement benefit plans for 2016 through 2020 and for the five years thereafter are summarized below (in millions):



	Projected Benefit
	Payments
			Other
	Pension		Postretirement

2016	$	221	$	56
2017	224		57
2018	226		58
2019	224		58
2020	225		61
2021-2025	1,054		272

Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

The target allocations (percentage of plan assets) for the Company's pension and other postretirement benefit plan assets are as follows as of December 31, 2015:



		Other
	Pension	Postretirement
	%	%
PacifiCorp:
Debt securities⁽¹⁾	33-37	33-37
Equity securities⁽¹⁾	53-57	61-65
Limited partnership interests	8-12	1-3
Other	0-1	0-1

MidAmerican Energy:
Debt securities⁽¹⁾	20-40	25-45
Equity securities⁽¹⁾	60-80	50-80
Real estate funds	2-8	—
Other	0-5	0-5

NV Energy:
Debt securities⁽¹⁾	53-77	40
Equity securities⁽¹⁾	23-47	60


(1)	For purposes of target allocation percentages and consistent with the plans' investment policy, investment funds are allocated based on the underlying investments in debt and equity securities.

The following table presents the fair value of plan assets, by major category, for the Company's defined benefit pension plans (in millions):



	Input Levels for Fair Value Measurements⁽¹⁾
	Level 1		Level 2		Level 3		Total
As of December 31, 2015
Cash equivalents	$	—	$	31	$	—	$	31
Debt securities:
United States government obligations	155		—		—		155
International government obligations	—		4		—		4
Corporate obligations	—		335		—		335
Municipal obligations	—		25		—		25
Agency, asset and mortgage-backed obligations	—		154		—		154
Equity securities:
United States companies	586		—		—		586
International companies	122		—		—		122
Investment funds⁽²⁾	144		821		—		965
Limited partnership interests⁽³⁾	—		—		65		65
Real estate funds	—		—		47		47
Total	$	1,007	$	1,370	$	112	$	2,489

As of December 31, 2014
Cash equivalents	$	15	$	54	$	—	$	69
Debt securities:
United States government obligations	166		—		—		166
International government obligations	—		11		—		11
Corporate obligations	—		268		—		268
Municipal obligations	—		27		—		27
Agency, asset and mortgage-backed obligations	—		94		—		94
Equity securities:
United States companies	698		—		—		698
International companies	122		—		—		122
Investment funds⁽²⁾	301		852		—		1,153
Limited partnership interests⁽³⁾	—		—		70		70
Real estate funds	—		—		40		40
Total	$	1,302	$	1,306	$	110	$	2,718


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


(2)	Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 66% and 34%, respectively, for 2015 and 61% and 39%, respectively, for 2014. Additionally, these funds are invested in United States and international securities of approximately 58% and 42%, respectively, for 2015 and 64% and 36%, respectively, for 2014.


(3)	Limited partnership interests include several funds that invest primarily in real estate, buyout, growth equity and venture capital.

The following table presents the fair value of plan assets, by major category, for the Company's defined benefit other postretirement plans (in millions):



	Input Levels for Fair Value Measurements⁽¹⁾
	Level 1		Level 2		Level 3		Total
As of December 31, 2015
Cash equivalents⁽²⁾	$	12	$	2	$	—	$	14
Debt securities:
United States government obligations	18		—		—		18
Corporate obligations	—		33		—		33
Municipal obligations	—		41		—		41
Agency, asset and mortgage-backed obligations	—		28		—		28
Equity securities:
United States companies	216		—		—		216
International companies	6		—		—		6
Investment funds⁽³⁾	149		153		—		302
Limited partnership interests⁽⁴⁾	—		—		4		4
Total	$	401	$	257	$	4	$	662

As of December 31, 2014
Cash equivalents	$	145	$	1	$	—	$	146
Debt securities:
United States government obligations	17		—		—		17
Corporate obligations	—		34		—		34
Municipal obligations	—		43		—		43
Agency, asset and mortgage-backed obligations	—		31		—		31
Equity securities:
United States companies	243		—		—		243
International companies	6		—		—		6
Investment funds⁽³⁾	202		131		—		333
Limited partnership interests⁽⁴⁾	—		—		5		5
Total	$	613	$	240	$	5	$	858


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


(2)	In December 2014, PacifiCorp began to migrate funds to cash and cash equivalents in anticipation of the $150 million to be transferred to a fund managed by the UMWA in May 2015 as a result of the other postretirement settlement. Remaining investments were rebalanced to align to PacifiCorp's target investment allocations.


(3)	Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 63% and 37%, respectively, for 2015 and 63% and 37%, respectively, for 2014. Additionally, these funds are invested in United States and international securities of approximately 70% and 30%, respectively, for 2015 and 69% and 31%, respectively, for 2014.


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

Level Three Defined Benefit Plan Assets Roll Forward [Table Text Block]

The following table reconciles the beginning and ending balances of the Company's plan assets measured at fair value using significant Level 3 inputs for the years ended December 31 (in millions):



						Other
	Pension					Postretirement-
	Limited			Real		Limited
	Partnership			Estate		Partnership
	Interests			Funds		Interests

Balance, December 31, 2012	$	96		$	26	$	7
Actual return on plan assets still held at period end	16			5		1
Purchases, sales, distributions and settlements	(26		)	—		(2		)
Balance, December 31, 2013	86			31		6
Actual return on plan assets still held at period end	(1		)	4		—
Purchases, sales, distributions and settlements	(15		)	5		(1		)
Balance, December 31, 2014	70			40		5
Actual return on plan assets still held at period end	5			7		—
Purchases, sales, distributions and settlements	(10		)	—		(1		)
Balance, December 31, 2015	$	65		$	47	$	4

UK Pension Plans [Member]

Changes in Fair Value of Plan Assets [Table Text Block]

Net periodic benefit cost for the UK Plan included the following components for the years ended December 31 (in millions):



	2015			2014			2013

Service cost	$	24		$	24		$	22
Interest cost	79			95			85
Expected return on plan assets	(116		)	(124		)	(101		)
Net amortization	62			51			53
Net periodic benefit cost	$	49		$	46		$	59

The following table is a reconciliation of the fair value of plan assets for the years ended December 31 (in millions):



	2015			2014

Plan assets at fair value, beginning of year	$	2,368		$	2,177
Employer contributions	77			89
Participant contributions	2			2
Actual return on plan assets	48			337
Benefits paid	(91		)	(92		)
Foreign currency exchange rate changes	(128		)	(145		)
Plan assets at fair value, end of year	$	2,276		$	2,368

Changes in Projected Benefit Obligations [Table Text Block]

The following table is a reconciliation of the benefit obligation for the years ended December 31 (in millions):



	2015			2014

Benefit obligation, beginning of year	$	2,279		$	2,185
Service cost	24			24
Interest cost	79			95
Participant contributions	2			2
Actuarial (gain) loss	(30		)	205
Benefits paid	(91		)	(92		)
Foreign currency exchange rate changes	(121		)	(140		)
Benefit obligation, end of year	$	2,142		$	2,279
Accumulated benefit obligation, end of year	$	1,891		$	2,019

Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]

The funded status of the UK Plan and the amounts recognized on the Consolidated Balance Sheets as of December 31 are as follows (in millions):



	2015		2014

Plan assets at fair value, end of year	$	2,276	$	2,368
Benefit obligation, end of year	2,142		2,279
Funded status	$	134	$	89

Amounts recognized on the Consolidated Balance Sheets:
Other assets	$	134	$	89

Net Periodic Benefit Costs Not Yet Recognized [Table Text Block]

A reconciliation of the amounts not yet recognized as components of net periodic benefit cost, which are included in accumulated other comprehensive loss on the Consolidated Balance Sheets, for the years ended December 31 is as follows (in millions):



	2015			2014

Balance, beginning of year	$	655		$	751
Net loss (gain) arising during the year	38			(8		)
Net amortization	(62		)	(51		)
Foreign currency exchange rate changes	(39		)	(37		)
Total	(63		)	(96		)
Balance, end of year	$	592		$	655

The portion of the funded status of the UK Plan not yet recognized in net periodic benefit cost as of December 31 is as follows (in millions):



	2015		2014

Net loss	$	592	$	655

Assumptions used to determine benefit obligations and net periodic benefit cost were as follows:



	2015		2014		2013

Benefit obligations as of December 31:
Discount rate	3.70	%	3.60	%	4.40	%
Rate of compensation increase	2.90	%	2.80	%	3.15	%
Rate of future price inflation	2.90	%	2.80	%	3.15	%

Net periodic benefit cost for the years ended December 31:
Discount rate	3.60	%	4.40	%	4.40	%
Expected return on plan assets	5.60	%	6.10	%	5.70	%
Rate of compensation increase	2.80	%	3.15	%	2.80	%
Rate of future price inflation	2.80	%	3.15	%	2.80	%

Employer contributions to the UK Plan are expected to be £40 million during 2016. The expected benefit payments to participants in the UK Plan for 2016 through 2020 and for the five years thereafter, using the foreign currency exchange rate as of December 31, 2015, are summarized below (in millions):



2016	$	88
2017	90
2018	92
2019	95
2020	97
2021-2025	522