Employee Benefit Plans (Notes)

12 Months Ended

Dec. 31, 2016

Defined Benefit Plan Disclosure [Line Items]

Employee Benefit Plans [Text Block]

Employee Benefit Plans

Defined Benefit Plans

Domestic Operations

The Utilities sponsor defined benefit pension plans that cover a majority of all employees of BHE and its domestic energy subsidiaries. These pension plans include noncontributory defined benefit pension plans, supplemental executive retirement plans ("SERP") and a restoration plan for certain executives of NV Energy. The Utilities also provide certain postretirement healthcare and life insurance benefits through various plans to eligible retirees.

Net Periodic Benefit Cost

For purposes of calculating the expected return on plan assets, a market-related value is used. The market-related value of plan assets is calculated by spreading the difference between expected and actual investment returns over a five-year period beginning after the first year in which they occur.

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

	Pension									Other Postretirement
	2016			2015			2014			2016			2015			2014
Service cost	$	29		$	33		$	36		$	9		$	11		$	14
Interest cost	126			121			131			31			31			46
Expected return on plan assets	(160		)	(169		)	(164		)	(41		)	(45		)	(53		)
Net amortization	46			53			44			(12		)	(11		)	(3		)
Net periodic benefit cost (credit)	$	41		$	38		$	47		$	(13	)	$	(14	)	$	4

Funded Status

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

	Pension						Other Postretirement
	2016			2015			2016			2015
Plan assets at fair value, beginning of year	$	2,489		$	2,718		$	662		$	858
Employer contributions	78			13			2			2
Participant contributions	—			—			10			9
Actual return on plan assets	163			(17		)	41			—
Settlement	(11		)	(23		)	—			(150		)
Benefits paid	(194		)	(202		)	(49		)	(57		)
Plan assets at fair value, end of year	$	2,525		$	2,489		$	666		$	662

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

	Pension						Other Postretirement
	2016			2015			2016			2015
Benefit obligation, beginning of year	$	2,934		$	3,119		$	740		$	936
Service cost	29			33			9			11
Interest cost	126			121			31			31
Participant contributions	—			—			10			9
Actuarial loss (gain)	67			(110		)	(7		)	(43		)
Amendment	1			(4		)	—			3
Settlement	(11		)	(23		)	—			(150		)
Benefits paid	(194		)	(202		)	(49		)	(57		)
Benefit obligation, end of year	$	2,952		$	2,934		$	734		$	740
Accumulated benefit obligation, end of year	$	2,929		$	2,906

In December 2014, PacifiCorp's subsidiary, Energy West Mining Company, reached a labor settlement with the UMWA covering union employees at PacifiCorp's Deer Creek mining operations. As a result of the labor settlement, the UMWA agreed to assume PacifiCorp's other postretirement benefit obligation associated with UMWA plan participants in exchange for PacifiCorp transferring $150 million to a fund managed by the UMWA. Transfer of the assets and settlement of this obligation occurred in May 2015 and resulted in a remeasurement of the other postretirement plan assets and benefit obligation. As a result of the remeasurement, PacifiCorp recognized a $9 million settlement loss, with the portion that is probable of recovery deferred as a regulatory asset. No curtailment accounting was triggered as a result of the settlement due to an insignificant impact to the average remaining service lives in the plan.

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
	2016			2015			2016			2015
Plan assets at fair value, end of year	$	2,525		$	2,489		$	666		$	662
Benefit obligation, end of year	2,952			2,934			734			740
Funded status	$	(427	)	$	(445	)	$	(68	)	$	(78	)
Amounts recognized on the Consolidated Balance Sheets:
Other assets	$	26		$	7		$	19		$	15
Other current liabilities	(15		)	(15		)	—			—
Other long-term liabilities	(438		)	(437		)	(87		)	(93		)
Amounts recognized	$	(427	)	$	(445	)	$	(68	)	$	(78	)

The SERPs and restoration plan have no plan assets; however, the Company has Rabbi trusts that hold corporate-owned life insurance and other investments to provide funding for the future cash requirements of the SERPs and restoration plan. The cash surrender value of all of the policies included in the Rabbi trusts, net of amounts borrowed against the cash surrender value, plus the fair market value of other Rabbi trust investments, was $242 million and $228 million as of December 31, 2016 and 2015, respectively. These assets are not included in the plan assets in the above table, but are reflected in noncurrent investments and restricted cash and investments on the Consolidated Balance Sheets.

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
	2016		2015		2016		2015
Fair value of plan assets	$	1,841	$	1,811	$	413	$	413
Projected benefit obligation	$	2,294	$	2,263	$	500	$	505
Accumulated benefit obligation	$	2,278	$	2,244

Unrecognized Amounts

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
	2016			2015			2016			2015
Net loss	$	775		$	768		$	88		$	97
Prior service credit	(7		)	(25		)	(52		)	(68		)
Regulatory deferrals	(7		)	(2		)	7			8
Total	$	761		$	741		$	43		$	37

A reconciliation of the amounts not yet recognized as components of net periodic benefit cost for the years ended December 31, 2016 and 2015 is as follows (in millions):

							Accumulated
							Other
	Regulatory			Regulatory			Comprehensive
	Asset			Liability			Loss			Total
Pension
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
Net loss arising during the year	76			(11		)	—			65
Net prior service cost arising during the year	1			—			—			1
Net amortization	(45		)	(1		)	—			(46		)
Total	32			(12		)	—			20
Balance, December 31, 2016	$	761		$	(13	)	$	13		$	761

	Regulatory			Regulatory
	Asset			Liability			Total
Other Postretirement
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
Net gain arising during the year	(5		)	(1		)	(6		)
Net amortization	11			1			12
Total	6			—			6
Balance, December 31, 2016	$	55		$	(12	)	$	43

The net loss, prior service credit and regulatory deferrals that will be amortized in 2017 into net periodic benefit cost are estimated to be as follows (in millions):

	Net		Prior Service			Regulatory
	Loss		Credit			Deferrals			Total
Pension	$	33	$	(3	)	$	(2	)	$	28
Other postretirement	2		(16		)	1			(13		)
Total	$	35	$	(19	)	$	(1	)	$	15

Plan Assumptions

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

	Pension						Other Postretirement
	2016		2015		2014		2016		2015		2014
Benefit obligations as of December 31:
Discount rate	4.06	%	4.43	%	4.00	%	4.01	%	4.33	%	3.88	%
Rate of compensation increase	2.75	%	2.75	%	2.75	%	N/A		N/A		N/A
Net periodic benefit cost for the years ended December 31:
Discount rate	4.43	%	4.00	%	4.81	%	4.33	%	3.93	%	4.82	%
Expected return on plan assets	6.78	%	6.88	%	6.86	%	7.03	%	7.00	%	7.34	%
Rate of compensation increase	2.75	%	2.75	%	3.00	%	N/A		N/A		N/A

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.

	2016		2015
Assumed healthcare cost trend rates as of December 31:
Healthcare cost trend rate assumed for next year	7.40	%	7.70	%
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, 2016	$	1	$	—
Other postretirement benefit obligation as of December 31, 2016	4		(4		)

Contributions and Benefit Payments

Employer contributions to the pension and other postretirement benefit plans are expected to be $14 million and $4 million, respectively, during 2017. Funding to the established pension trusts is based upon the actuarially determined costs of the plans and the requirements of the Internal Revenue Code, the Employee Retirement Income Security Act of 1974 and the Pension Protection Act of 2006, as amended. The Company considers contributing additional amounts from time to time in order to achieve certain funding levels specified under the Pension Protection Act of 2006, as amended. The Company's funding policy for its other postretirement benefit plans is to generally contribute an amount equal to the net periodic benefit cost.

The expected benefit payments to participants in the Company's pension and other postretirement benefit plans for 2017 through 2021 and for the five years thereafter are summarized below (in millions):

	Projected Benefit
	Payments
			Other
	Pension		Postretirement
2017	$	219	$	56
2018	226		57
2019	224		57
2020	221		60
2021	214		57
2022-2026	1,002		259

Plan Assets

Investment Policy and Asset Allocations

The Company's investment policy for its pension and other postretirement benefit plans is to balance risk and return through a diversified portfolio of debt securities, equity securities and other alternative investments. Maturities for debt securities are managed to targets consistent with prudent risk tolerances. The plans retain outside investment advisors to manage plan investments within the parameters outlined by each plan's Pension and Employee Benefits Plans Administrative Committee. The investment portfolio is managed in line with the investment policy with sufficient liquidity to meet near-term benefit payments.

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, 2016:

		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.

Fair Value Measurements

The Company adopted ASU No. 2015-07, "Fair Value Measurement (Topic 820) - Disclosures for Investments in Certain Entities that Calculate Net Asset Value per Share (or its Equivalent)" effective January 1, 2016 under a retrospective method.

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, 2016:
Cash equivalents	$	4	$	54	$	—	$	58
Debt securities:
United States government obligations	161		—		—		161
International government obligations	—		2		—		2
Corporate obligations	—		295		—		295
Municipal obligations	—		20		—		20
Agency, asset and mortgage-backed obligations	—		112		—		112
Equity securities:
United States companies	583		—		—		583
International companies	117		—		—		117
Investment funds(2)	146		—		—		146
Total assets in the fair value hierarchy	$	1,011	$	483	$	—	1,494
Investment funds(2) measured at net asset value							920
Limited partnership interests(3) measured at net asset value							61
Real estate funds measured at net asset value							50
Total assets measured at fair value							$	2,525
As of December 31, 2015:
Cash equivalents	$	—	$	26	$	—	$	26
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		—		—		144
Total assets in the fair value hierarchy	$	1,007	$	544	$	—	1,551
Investment funds(2) measured at net asset value							823
Limited partnership interests(3) measured at net asset value							65
Real estate funds measured at net asset value							50
Total assets measured at fair value							$	2,489

(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 62% and 38%, respectively, for 2016 and 66% and 34%, respectively, for 2015. Additionally, these funds are invested in United States and international securities of approximately 60% and 40%, respectively, for 2016 and 58% and 42%, respectively, for 2015.

(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, 2016:
Cash equivalents	$	18	$	2	$	—	$	20
Debt securities:
United States government obligations	19		—		—		19
Corporate obligations	—		29		—		29
Municipal obligations	—		39		—		39
Agency, asset and mortgage-backed obligations	—		25		—		25
Equity securities:
United States companies	217		—		—		217
International companies	5		—		—		5
Investment funds(2)	152		—		—		152
Total assets in the fair value hierarchy	$	411	$	95	$	—	506
Investment funds(2) measured at net asset value							156
Limited partnership interests(3) measured at net asset value							4
Total assets measured at fair value							$	666
As of December 31, 2015:
Cash equivalents	$	12	$	1	$	—	$	13
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(2)	149		—		—		149
Total assets in the fair value hierarchy	$	401	$	103	$	—	504
Investment funds(2) measured at net asset value							154
Limited partnership interests(3) measured at net asset value							4
Total assets measured at fair value							$	662

(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 63% and 37%, respectively, for both 2016 and 2015. Additionally, these funds are invested in United States and international securities of approximately 72% and 28%, respectively, for 2016 and 70% and 30%, respectively, for 2015.

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

For level 1 investments, a readily observable quoted market price or net asset value of an identical security in an active market is used to record the fair value. For level 2 investments, the fair value is determined using pricing models based on observable market inputs. Shares of mutual funds not registered under the Securities Act of 1933, private equity limited partnership interests, common and commingled trust funds and investment entities are reported at fair value based on the net asset value per unit, which is used for expedience purposes. A fund’s net asset value is based on the fair value of the underlying assets held by the fund less its liabilities.

Foreign Operations

Certain wholly-owned subsidiaries of Northern Powergrid participate in the Northern Powergrid group of the United Kingdom industry-wide Electricity Supply Pension Scheme (the "UK Plan"), which provides pension and other related defined benefits, based on final pensionable pay, to the majority of the employees of Northern Powergrid. The UK Plan is closed to employees hired after July 23, 1997. Employees hired after that date are covered by a defined contribution plan sponsored by a wholly-owned subsidiary of Northern Powergrid.

Net Periodic Benefit Cost

For purposes of calculating the expected return on pension plan assets, a market-related value is used. The market-related value of plan assets is calculated by spreading the difference between expected and actual investment returns over a five-year period beginning after the first year in which they occur.

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

	2016			2015			2014
Service cost	$	20		$	24		$	24
Interest cost	72			79			95
Expected return on plan assets	(110		)	(116		)	(124		)
Net amortization	44			62			51
Net periodic benefit cost	$	26		$	49		$	46

Funded Status

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

	2016			2015
Plan assets at fair value, beginning of year	$	2,276		$	2,368
Employer contributions	55			77
Participant contributions	1			2
Actual return on plan assets	349			48
Benefits paid	(115		)	(91		)
Foreign currency exchange rate changes	(397		)	(128		)
Plan assets at fair value, end of year	$	2,169		$	2,276

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

	2016			2015
Benefit obligation, beginning of year	$	2,142		$	2,279
Service cost	20			24
Interest cost	72			79
Participant contributions	1			2
Actuarial loss (gain)	387			(30		)
Benefits paid	(115		)	(91		)
Foreign currency exchange rate changes	(382		)	(121		)
Benefit obligation, end of year	$	2,125		$	2,142
Accumulated benefit obligation, end of year	$	1,858		$	1,891

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):

	2016		2015
Plan assets at fair value, end of year	$	2,169	$	2,276
Benefit obligation, end of year	2,125		2,142
Funded status	$	44	$	134
Amounts recognized on the Consolidated Balance Sheets:
Other assets	$	44	$	134

Unrecognized Amounts

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):

	2016		2015
Net loss	$	590	$	592

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):

	2016			2015
Balance, beginning of year	$	592		$	655
Net loss arising during the year	148			38
Net amortization	(44		)	(62		)
Foreign currency exchange rate changes	(106		)	(39		)
Total	(2		)	(63		)
Balance, end of year	$	590		$	592

The net loss that will be amortized from accumulated other comprehensive loss in 2017 into net periodic benefit cost is estimated to be $65 million.

Plan Assumptions

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

	2016		2015		2014
Benefit obligations as of December 31:
Discount rate	2.70	%	3.70	%	3.60	%
Rate of compensation increase	3.00	%	2.90	%	2.80	%
Rate of future price inflation	3.00	%	2.90	%	2.80	%
Net periodic benefit cost for the years ended December 31:
Discount rate	3.70	%	3.60	%	4.40	%
Expected return on plan assets	5.60	%	5.60	%	6.10	%
Rate of compensation increase	2.90	%	2.80	%	3.15	%
Rate of future price inflation	2.90	%	2.80	%	3.15	%

Contributions and Benefit Payments

Employer contributions to the UK Plan are expected to be £37 million during 2017. The expected benefit payments to participants in the UK Plan for 2017 through 2021 and for the five years thereafter, using the foreign currency exchange rate as of December 31, 2016, are summarized below (in millions):

2017	$	75
2018	77
2019	79
2020	81
2021	83
2022-2026	448

Plan Assets

Investment Policy and Asset Allocations

The investment policy for the UK Plan is to balance risk and return through a diversified portfolio of debt securities, equity securities and real estate. Maturities for debt securities are managed to targets consistent with prudent risk tolerances. The UK Plan retains outside investment advisors to manage plan investments within the parameters set by the trustees of the UK Plan in consultation with Northern Powergrid. The investment portfolio is managed in line with the investment policy with sufficient liquidity to meet near-term benefit payments. The return on assets assumption is based on a weighted-average of the expected historical performance for the types of assets in which the UK Plan invests.

The target allocations (percentage of plan assets) for the UK Plan assets are as follows as of December 31, 2016:

	%
Debt securities(1)	50-55
Equity securities(1)	35-40
Real estate funds and other	5-15

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

Fair Value Measurements

The Company adopted ASU No. 2015-07, "Fair Value Measurement (Topic 820) - Disclosures for Investments in Certain Entities that Calculate Net Asset Value per Share (or its Equivalent)" effective January 1, 2016 under a retrospective method.

The following table presents the fair value of the UK Plan assets, by major category, (in millions):

	Input Levels for Fair Value Measurements(1)
	Level 1		Level 2		Level 3		Total
As of December 31, 2016:
Cash equivalents	$	4	$	83	$	—	$	87
Debt securities:
United Kingdom government obligations	718		—		—		718
Equity securities:
Investment funds(2)	—		1,095		—		1,095
Real estate funds	—		—		105		105
Total	$	722	$	1,178	$	105	2,005
Investment funds(2) measured at net asset value							164
Total assets measured at fair value							$	2,169
As of December 31, 2015:
Cash equivalents	$	46	$	—	$	—	$	46
Debt securities:
United Kingdom government obligations	424		—		—		424
Other international government obligations	—		13		—		13
Corporate obligations	—		186		—		186
Equity securities:
Investment funds(2)	24		1,189		—		1,213
Real estate funds	—		—		204		204
Total	$	494	$	1,388	$	204	2,086
Investment funds(2) measured at net asset value							190
Total assets measured at fair value							$	2,276

(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 44% and 56%, respectively, for both 2016 and 2015.

The fair value of the UK Plan's assets are determined similar to the plan assets of the domestic plans as previously discussed.

The following table reconciles the beginning and ending balances of the UK Plan assets measured at fair valueusing significant Level 3 inputs for the years ended December 31 (in millions):

	Real Estate Funds
	2016			2015			2014
Beginning balance	$	204		$	199		$	179
Actual return on plan assets still held at period end	10			18			33
Sales	(80		)	—			—
Foreign currency exchange rate changes	(29		)	(13		)	(13		)
Ending balance	$	105		$	204		$	199

Defined Contribution Plans

The Company sponsors various defined contribution plans covering substantially all employees. The Company's contributions vary depending on the plan, but matching contributions are based on each participant's level of contribution, and certain participants receive contributions based on eligible pre-tax annual compensation. Contributions cannot exceed the maximum allowable for tax purposes. The Company's contributions to these plans were $102 million, $90 million and $83 million for the years ended December 31, 2016, 2015 and 2014, respectively.

PacifiCorp [Member]

Defined Benefit Plan Disclosure [Line Items]

Employee Benefit Plans [Text Block]

Employee Benefit Plans

PacifiCorp sponsors defined benefit pension and other postretirement benefit plans that cover the majority of its employees, as well as a defined contribution 401(k) employee savings plan ("401(k) Plan"). In addition, PacifiCorp contributes to a joint trustee pension plan and a subsidiary previously contributed to a multiemployer pension plan for benefits offered to certain bargaining units.

Pension and Other Postretirement Benefit Plans

PacifiCorp's pension plans include non-contributory defined benefit pension plans, collectively the PacifiCorp Retirement Plan ("Retirement Plan"), and the Supplemental Executive Retirement Plan ("SERP"). The Retirement Plan is closed to all non-union employees hired after January 1, 2008. All non-union Retirement Plan participants hired prior to January 1, 2008 that did not elect to receive equivalent fixed contributions to the 401(k) Plan effective January 1, 2009 earned benefits based on a cash balance formula through December 31, 2016. Effective January 1, 2017, non-union employee participants with a cash balance benefit in the Retirement Plan are no longer eligible to receive pay credits in their cash balance formula. In general for union employees, benefits under the Retirement Plan were frozen at various dates from December 31, 2007 through December 31, 2011 as they are now being provided with enhanced 401(k) Plan benefits. However, certain limited union Retirement Plan participants continue to earn benefits under the Retirement Plan based on the employee's years of service and a final average pay formula. The SERP was closed to new participants as of March 21, 2006 and froze future accruals for active participants as of December 31, 2014.

PacifiCorp's other postretirement benefit plan provides healthcare and life insurance benefits to eligible retirees.

Utah Mine Disposition and Labor Agreement

In conjunction with the Utah Mine Disposition described in Note 5, in December 2014, PacifiCorp's subsidiary, Energy West Mining Company, reached a labor settlement with the UMWA covering union employees at PacifiCorp's Deer Creek mining operations. As a result of the labor settlement, the UMWA agreed to assume PacifiCorp's other postretirement benefit obligation associated with UMWA plan participants in exchange for PacifiCorp transferring $150 million to a fund managed by the UMWA. Transfer of the assets and settlement of this obligation occurred in May 2015 and resulted in a remeasurement of the other postretirement plan assets and benefit obligation. As a result of the remeasurement, PacifiCorp recognized a $9 million settlement loss, with the portion that is probable of recovery deferred as a regulatory asset. No curtailment accounting was triggered as a result of the settlement due to an insignificant impact to the average remaining service lives in the plan.

As a result of the closure of the Deer Creek mining operations, withdrawal from the UMWA 1974 Pension Plan was involuntarily triggered in June 2015 when UMWA employees ceased performing work for the subsidiary. Refer to "Multiemployer and Joint Trustee Pension Plans" for further information regarding the withdrawal.

Net Periodic Benefit Cost

For purposes of calculating the expected return on plan assets, a market-related value is used. The market-related value of plan assets is calculated by spreading the difference between expected and actual investment returns over a five-year period beginning after the first year in which they occur.

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

	Pension									Other Postretirement
	2016			2015			2014			2016			2015			2014
Service cost	$	4		$	4		$	5		$	2		$	3		$	6
Interest cost	54			53			57			15			16			28
Expected return on plan assets	(75		)	(77		)	(76		)	(21		)	(23		)	(31		)
Net amortization	34			42			29			(5		)	(4		)	2
Net periodic benefit cost (credit)	$	17		$	22		$	15		$	(9	)	$	(8	)	$	5

Funded Status

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

	Pension						Other Postretirement
	2016			2015			2016			2015
Plan assets at fair value, beginning of year	$	1,043		$	1,146		$	305		$	482
Employer contributions	5			4			1			1
Participant contributions	—			—			6			6
Actual return on plan assets	51			—			17			1
Settlement	—			—			—			(150		)
Benefits paid	(100		)	(107		)	(27		)	(35		)
Plan assets at fair value, end of year	$	999		$	1,043		$	302		$	305

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

	Pension						Other Postretirement
	2016			2015			2016			2015
Benefit obligation, beginning of year	$	1,289		$	1,378		$	362		$	539
Service cost	4			4			2			3
Interest cost	54			53			15			16
Participant contributions	—			—			6			6
Actuarial (gain) loss	29			(39		)	—			(17		)
Settlement	—			—			—			(150		)
Benefits paid	(100		)	(107		)	(27		)	(35		)
Benefit obligation, end of year	$	1,276		$	1,289		$	358		$	362
Accumulated benefit obligation, end of year	$	1,276		$	1,289

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
	2016			2015			2016			2015
Plan assets at fair value, end of year	$	999		$	1,043		$	302		$	305
Less - Benefit obligation, end of year	1,276			1,289			358			362
Funded status	$	(277	)	$	(246	)	$	(56	)	$	(57	)
Amounts recognized on the Consolidated Balance Sheets:
Other current liabilities	$	(5	)	$	(4	)	$	—		$	—
Other long-term liabilities	(272		)	(242		)	(56		)	(57		)
Amounts recognized	$	(277	)	$	(246	)	$	(56	)	$	(57	)

The SERP has no plan assets; however, PacifiCorp has a Rabbi trust that holds corporate-owned life insurance and other investments to provide funding for the future cash requirements of the SERP. The cash surrender value of all of the policies included in the Rabbi trust, net of amounts borrowed against the cash surrender value, plus the fair market value of other Rabbi trust investments, was $55 million and $52 million as of December 31, 2016 and 2015, respectively. These assets are not included in the plan assets in the above table, but are reflected in noncurrent other assets on the Consolidated Balance Sheets.

Unrecognized Amounts

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
	2016			2015			2016			2015
Net loss	$	518		$	508		$	39		$	36
Prior service credit	—			(13		)	(13		)	(19		)
Regulatory deferrals	(7		)	(3		)	8			9
Total	$	511		$	492		$	34		$	26

A reconciliation of the amounts not yet recognized as components of net periodic benefit cost for the years ended December 31, 2016 and 2015 is as follows (in millions):

				Accumulated
				Other
	Regulatory			Comprehensive
	Asset			Loss			Total
Pension
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
Net loss arising during the year	51			2			53
Net amortization	(33		)	(1		)	(34		)
Total	18			1			19
Balance, December 31, 2016	$	491		$	20		$	511

	Regulatory
	Asset
Other Postretirement
Balance, December 31, 2014	$	17
Net loss arising during the year	5
Net amortization	4
Total	9
Balance, December 31, 2015	26
Net loss arising during the year	3
Net amortization	5
Total	8
Balance, December 31, 2016	$	34

The net loss, prior service credit and regulatory deferrals that will be amortized in 2017 into net periodic benefit cost are estimated to be as follows (in millions):

	Net		Prior Service			Regulatory
	Loss		Credit			Deferrals			Total
Pension	$	16	$	—		$	(2	)	$	14
Other postretirement	—		(7		)	1			(6		)
Total	$	16	$	(7	)	$	(1	)	$	8

Plan Assumptions

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

	Pension						Other Postretirement
	2016		2015		2014		2016		2015		2014
Benefit obligations as of December 31:
Discount rate	4.05	%	4.40	%	4.00	%	4.05	%	4.35	%	3.90	%
Rate of compensation increase	N/A		2.75		2.75		N/A		N/A		N/A
Net periodic benefit cost for the years ended December 31:
Discount rate	4.40	%	4.00	%	4.80	%	4.35	%	3.99	%	4.90	%
Expected return on plan assets	7.50		7.50		7.50		7.50		7.08		7.50
Rate of compensation increase	2.75		2.75		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 a plan amendment effective on January 1, 2017, the benefit obligation for the Retirement Plan is no longer affected by future increases in compensation. 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.

Contributions and Benefit Payments

Employer contributions to the pension and other postretirement benefit plans are expected to be $5 million and $- million, respectively, during 2017. Funding to PacifiCorp's Retirement Plan trust is based upon the actuarially determined costs of the plan and the requirements of the Internal Revenue Code, the Employee Retirement Income Security Act of 1974 ("ERISA") and the Pension Protection Act of 2006, as amended ("PPA"). PacifiCorp considers contributing additional amounts from time to time in order to achieve certain funding levels specified under the PPA. PacifiCorp's funding policy for its other postretirement benefit plan is to generally contribute an amount equal to the net periodic benefit cost, subject to tax deductibility limitations and other considerations.

The expected benefit payments to participants in PacifiCorp's pension and other postretirement benefit plans for 2017 through 2021 and for the five years thereafter are summarized below (in millions):

	Projected Benefit Payments
	Pension		Other Postretirement
2017	$	105	$	28
2018	109		28
2019	108		27
2020	104		30
2021	97		26
2022-2026	426		116

Plan Assets

Investment Policy and Asset Allocations

PacifiCorp's investment policy for its pension and other postretirement benefit plans is to balance risk and return through a diversified portfolio of debt securities, equity securities and other alternative investments. Maturities for debt securities are managed to targets consistent with prudent risk tolerances. The plans retain outside investment advisors to manage plan investments within the parameters outlined by the PacifiCorp Pension Committee. The investment portfolio is managed in line with the investment policy with sufficient liquidity to meet near-term benefit payments.

The target allocations (percentage of plan assets) for PacifiCorp's pension and other postretirement benefit plan assets are as follows as of December 31, 2016:

	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.

Fair Value Measurements

PacifiCorp adopted ASU No. 2015-07, "Fair Value Measurement (Topic 820) - Disclosures for Investments in Certain Entities that Calculate Net Asset Value per Share (or its Equivalent)" effective January 1, 2016 under a retrospective method.

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, 2016:
Cash equivalents	$	—	$	10	$	—	$	10
Debt securities:
United States government obligations	25		—		—		25
Corporate obligations	—		36		—		36
Municipal obligations	—		6		—		6
Agency, asset and mortgage-backed obligations	—		37		—		37
Equity securities:
United States companies	389		—		—		389
International companies	15		—		—		15
Investment funds(2)	83		—		—		83
Total assets in the fair value hierarchy	$	512	$	89	$	—	601
Investment funds(2) measured at net asset value							337
Limited partnership interests(3) measured at net asset value							61
Investments at fair value							$	999
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		—		—		83
Total assets in the fair value hierarchy	$	527	$	100	$	—	627
Investment funds(2) measured at net asset value							351
Limited partnership interests(3) measured at net asset value							65
Investments at fair value							$	1,043

(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 approximately54% and 46% respectively, for 2016 and 53% and 47%, respectively, for 2015, and are invested in United States and international securities of approximately 39% and 61%, respectively, for 2016 and 40% and 60%, respectively, for 2015.

(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, 2016:
Cash and cash equivalents	$	4	$	1	$	—	$	5
Debt securities:
United States government obligations	11		—		—		11
Corporate obligations	—		13		—		13
Municipal obligations	—		2		—		2
Agency, asset and mortgage-backed obligations	—		13		—		13
Equity securities:
United States companies	93		—		—		93
International companies	4		—		—		4
Investment funds(2)	32		—		—		32
Total assets in the fair value hierarchy	$	144	$	29	$	—	173
Investment funds(2) measured at net asset value							125
Limited partnership interests(3) measured at net asset value							4
Investments at fair value							$	302
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		—		—		32
Total assets in the fair value hierarchy	$	144	$	31	$	—	175
Investment funds(2) measured at net asset value							126
Limited partnership interests(3) measured at net asset value							4
Investments at fair value							$	305

(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 approximately62% and 38%, respectively, for 2016 and 61% and 39%, respectively, for 2015, and are invested in United States and international securities of approximately 71% and 29%, respectively, for 2016 and 67% and 33%, respectively, for 2015.

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

For level 1 investments, a readily observable quoted market price or net asset value of an identical security in an active market is used to record the fair value. For level 2 investments, the fair value is determined using pricing models based on observable market inputs. Shares of mutual funds not registered under the Securities Act of 1933, private equity limited partnership interests, common and commingled trust funds and investment entities are reported at fair value based on the net asset value per unit, which is used for expedience purposes. A fund’s net asset value is based on the fair value of the underlying assets held by the fund less its liabilities.

Multiemployer and Joint Trustee Pension Plans

PacifiCorp contributes to the PacifiCorp/IBEW Local 57 Retirement Trust Fund ("Local 57 Trust Fund") (plan number 001) and its subsidiary, Energy West Mining Company, previously contributed to the UMWA 1974 Pension Plan (plan number 002). Contributions to these pension plans are based on the terms of collective bargaining agreements.

As a result of the Utah Mine Disposition and UMWA labor settlement, PacifiCorp's subsidiary, Energy West Mining Company, triggered involuntary withdrawal from the UMWA 1974 Pension Plan in June 2015 when the UMWA employees ceased performing work for the subsidiary. PacifiCorp recorded its estimate of the withdrawal obligation in December 2014 when withdrawal was considered probable and deferred the portion of the obligation considered probable of recovery to a regulatory asset. PacifiCorp has subsequently revised its estimate due to changes in facts and circumstances for a withdrawal occurring by July 2015. As communicated in a letter received in August 2016, the plan trustees have determined a withdrawal liability of $115 million. Energy West Mining Company began making installment payments in November 2016 and has the option to elect a lump sum payment to settle the withdrawal obligation. The ultimate amount paid by Energy West Mining Company to settle the obligation is dependent on a variety of factors, including the results of ongoing negotiations with the plan trustees.

The Local 57 Trust Fund is a joint trustee plan such that the board of trustees is represented by an equal number of trustees from PacifiCorp and the union. The Local 57 Trust Fund was established pursuant to the provisions of the Taft-Hartley Act and although formed with the ability for other employers to participate in the plan, there are no other employers that participate in this plan.

The risk of participating in multiemployer pension plans generally differs from single-employer plans in that assets are pooled such that contributions by one employer may be used to provide benefits to employees of other participating employers and plan assets cannot revert back to employers. If an employer ceases participation in the plan, the employer may be obligated to pay a withdrawal liability based on the participants' unfunded, vested benefits in the plan. This occurred as a result of Energy West Mining Company's withdrawal from the UMWA 1974 Pension Plan. If participating employers withdraw from a multiemployer plan, the unfunded obligations of the plan may be borne by the remaining participating employers, including any employers that withdrew during the three years prior to a mass withdrawal.

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	2016	2015	2014	Funding improvement plan	Surcharge imposed under PPA(1)	2016		2015		2014		Year contributions to plan exceeded more than 5% of total contributions(2)
UMWA 1974 Pension Plan	52-1050282	Critical and Declining	Critical and Declining	Critical	Implemented	Yes	$	—	$	1	$	2	None
Local 57 Trust Fund	87-0640888	At least 80%	At least 80%	At least 80%	None	None	$	8	$	8	$	9	2015, 2014, 2013

(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, 2014, 2013 and 2012. Information for the plan year beginning July 1, 2015 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.

The current collective bargaining agreements governing the Local 57 Trust Fund expire in 2020.

Defined Contribution Plan

PacifiCorp's 401(k) plan covers substantially all employees. PacifiCorp's matching contributions are based on each participant's level of contribution and, as of January 1, 2017, all participants receive contributions based on eligible pre-tax annual compensation. Contributions cannot exceed the maximum allowable for tax purposes. PacifiCorp's contributions to the 401(k) plan were $34 million, $35 million and $34 million for the years ended December 31, 2016, 2015 and 2014, respectively.

MidAmerican Energy Company [Member]

Defined Benefit Plan Disclosure [Line Items]

Employee Benefit Plans [Text Block]

Employee Benefit Plans

MidAmerican Energy sponsors a noncontributory defined benefit pension plan covering a majority of all employees of BHE and its domestic energy subsidiaries other than PacifiCorp and NV Energy, Inc. Benefit obligations under the plan are based on a cash balance arrangement for salaried employees and most union employees and final average pay formulas for other union employees. MidAmerican Energy also maintains noncontributory, nonqualified defined benefit supplemental executive retirement plans ("SERP") for certain active and retired participants.

MidAmerican Energy also sponsors certain postretirement healthcare and life insurance benefits covering substantially all retired employees of BHE and its domestic energy subsidiaries other than PacifiCorp and NV Energy, Inc. Under the plans, a majority of all employees of the participating companies may become eligible for these benefits if they reach retirement age. New employees are not eligible for benefits under the plans. MidAmerican Energy has been allowed to recover accrued pension and other postretirement benefit costs in its electric and gas service rates.

Net Periodic Benefit Cost

For purposes of calculating the expected return on pension plan assets, a market-related value is used. The market-related value of plan assets is calculated by spreading the difference between expected and actual investment returns on equity investments over a five-year period beginning after the first year in which they occur.

MidAmerican Energy bills to and is reimbursed currently for affiliates' share of the net periodic benefit costs from all plans in which such affiliates participate. In 2016, 2015 and 2014, MidAmerican Energy's share of the pension net periodic benefit cost (credit) was $(2) million, $(4) million and $1 million, respectively. MidAmerican Energy's share of the other postretirement net periodic benefit cost (credit) in 2016, 2015 and 2014 totaled $(1) million, $- million and $- million, respectively.

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
	2016			2015			2014			2016			2015			2014
Service cost	$	10		$	12		$	14		$	5		$	7		$	6
Interest cost	34			32			35			10			9			10
Expected return on plan assets	(44		)	(46		)	(45		)	(13		)	(15		)	(15		)
Net amortization	2			2			1			(4		)	(3		)	(3		)
Net periodic benefit cost (credit)	$	2		$	—		$	5		$	(2	)	$	(2	)	$	(2	)

Funded Status

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

	Pension						Other Postretirement
	2016			2015			2016			2015
Plan assets at fair value, beginning of year	$	678		$	730		$	249		$	259
Employer contributions	7			7			1			1
Participant contributions	—			—			1			1
Actual return on plan assets	57			4			14			—
Benefits paid	(58		)	(63		)	(13		)	(12		)
Plan assets at fair value, end of year	$	684		$	678		$	252		$	249

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

	Pension						Other Postretirement
	2016			2015			2016			2015
Benefit obligation, beginning of year	$	785		$	840		$	234		$	249
Service cost	10			12			5			7
Interest cost	34			32			10			9
Participant contributions	—			—			1			1
Actuarial loss (gain)	2			(36		)	(4		)	(20		)
Benefits paid	(58		)	(63		)	(13		)	(12		)
Benefit obligation, end of year	$	773		$	785		$	233		$	234
Accumulated benefit obligation, end of year	$	764		$	773

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
	2016			2015			2016		2015
Plan assets at fair value, end of year	$	684		$	678		$	252	$	249
Less - Benefit obligation, end of year	773			785			233		234
Funded status	$	(89	)	$	(107	)	$	19	$	15
Amounts recognized on the Balance Sheets:
Other assets	$	26		$	7		$	19	$	15
Other current liabilities	(8		)	(8		)	—		—
Other liabilities	(107		)	(106		)	—		—
Amounts recognized	$	(89	)	$	(107	)	$	19	$	15

The SERP has no plan assets; however, MidAmerican Energy and BHE have Rabbi trusts that hold corporate-owned life insurance and other investments to provide funding for the future cash requirements of the SERP. The cash surrender value of all of the policies included in the Rabbi trusts, net of amounts borrowed against the cash surrender value, plus the fair market value of other Rabbi trust investments, was $166 million and $156 million as of December 31, 2016 and 2015, respectively, of which $110 million and $104 million was held by MidAmerican Energy as of December 31, 2016 and 2015, respectively, with the remainder held by BHE. These assets are not included in the plan assets in the above table, but are reflected in investments and nonregulated property, net on the Balance Sheets.

Unrecognized Amounts

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
	2016		2015		2016			2015
Net loss	$	15	$	26	$	36		$	42
Prior service cost (credit)	1		2		(31		)	(36		)
Total	$	16	$	28	$	5		$	6

MidAmerican Energy sponsors pension and other postretirement benefit plans on behalf of certain of its affiliates in addition to itself, and therefore, the portion of the funded status of the respective plans that has not yet been recognized in net periodic benefit cost is attributable to multiple entities. Additionally, substantially all of MidAmerican Energy's portion of such amounts is either refundable to or recoverable from its customers and is reflected as regulatory liabilities and regulatory assets.

A reconciliation of the amounts not yet recognized as components of net periodic benefit cost for the years ended December 31, 2016 and 2015 is as follows (in millions):

	Regulatory Asset			Regulatory Liability			Receivables (Payables) with Affiliates			Total
Pension
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
Net gain arising during the year	1			(11		)	—			(10		)
Net amortization	(1		)	(1		)	—			(2		)
Total	—			(12		)	—			(12		)
Balance, December 31, 2016	$	22		$	(12	)	$	6		$	16

	Regulatory Asset			Regulatory Liability		Receivables (Payables) with Affiliates			Total
Other Postretirement
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
Net gain arising during the year	(2		)	—		(3		)	(5		)
Net amortization	3			—		1			4
Total	1			—		(2		)	(1		)
Balance, December 31, 2016	$	18		$	—	$	(13	)	$	5

The net loss and prior service cost (credit) that will be amortized in 2017 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	)

Plan Assumptions

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

	Pension						Other Postretirement
	2016		2015		2014		2016		2015		2014
Benefit obligations as of December 31:
Discount rate	4.10	%	4.50	%	4.00	%	3.90	%	4.25	%	3.75	%
Rate of compensation increase	2.75	%	2.75	%	2.75	%	N/A		N/A		N/A
Net periodic benefit cost for the years ended December 31:
Discount rate	4.50	%	4.00	%	4.75	%	4.25	%	3.75	%	4.50	%
Expected return on plan assets(1)	7.00	%	7.25	%	7.50	%	6.75	%	7.00	%	7.25	%
Rate of compensation increase	2.75	%	2.75	%	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 5.00% for 2016, and 5.18% for 2015, and 5.37% for 2014.

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.

	2016		2015
Assumed healthcare cost trend rates as of December 31:
Healthcare cost trend rate assumed for next year	7.40	%	7.70	%
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, 2016	$	—	$	—
Other postretirement benefit obligation as of December 31, 2016	3		(2		)

Contributions and Benefit Payments

Employer contributions to the pension and other postretirement benefit plans are expected to be $8 million and $1 million, respectively, during 2017. Funding to MidAmerican Energy's pension benefit plan trust is based upon the actuarially determined costs of the plan and the requirements of the Internal Revenue Code, the Employee Retirement Income Security Act of 1974 and the Pension Protection Act of 2006, as amended. MidAmerican Energy considers contributing additional amounts from time to time in order to achieve certain funding levels specified under the Pension Protection Act of 2006, as amended. MidAmerican Energy's funding policy for its other postretirement benefit plan is to generally contribute amounts consistent with its rate regulatory arrangements.

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 2017 through 2021 and for the five years thereafter are summarized below (in millions):

	Projected Benefit Payments
	Pension		Other Postretirement
2017	$	60	$	18
2018	60		19
2019	62		20
2020	62		21
2021	60		21
2022-2026	278		97

Plan Assets

Investment Policy and Asset Allocations

MidAmerican Energy's investment policy for its pension and other postretirement benefit plans is to balance risk and return through a diversified portfolio of debt securities, equity securities and other alternative investments. Maturities for debt securities are managed to targets consistent with prudent risk tolerances. The plans retain outside investment advisors to manage plan investments within the parameters outlined by the MidAmerican Energy Pension and Employee Benefits Plans Administrative Committee. The investment portfolio is managed in line with the investment policy with sufficient liquidity to meet near-term benefit payments.

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, 2016:

	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.

Fair Value Measurements

MidAmerican Energy adopted ASU No. 2015-07, "Fair Value Measurement (Topic 820) - Disclosures for Investments in Certain Entities that Calculate Net Asset Value per Share (or its Equivalent)" effective January 1, 2016 under a retrospective method.

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, 2016:
Cash equivalents	$	—	$	17	$	—	$	17
Debt securities:
United States government obligations	9		—		—		9
Corporate obligations	—		53		—		53
Municipal obligations	—		6		—		6
Agency, asset and mortgage-backed obligations	—		22		—		22
Equity securities:
United States companies	130		—		—		130
International equity securities	39		—		—		39
Investment funds(2)	63		—		—		63
Total assets in the hierarchy	$	241	$	98	$	—	339
Investment funds(2) measured at net asset value							295
Real estate funds measured at net asset value							50
Total assets measured at fair value							$	684
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		—		—		61
Total assets in the hierarchy	$	236	$	106	$	—	342
Investment funds(2) measured at net asset value							296
Real estate funds measured at net asset value							40
Total assets measured at fair value							$	678

(1) Refer to Note 14 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 74% and 26%, respectively, for 2016 and 72% and 28%, respectively, for 2015. Additionally, these funds are invested in United States and international securities of approximately 71% and 29%, respectively, for 2016 and 73% and 27%, respectively, for 2015.

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, 2016:
Cash equivalents	$	10	$	—	$	—	$	10
Debt securities:
United States government obligations	5		—		—		5
Corporate obligations	—		11		—		11
Municipal obligations	—		37		—		37
Agency, asset and mortgage-backed obligations	—		11		—		11
Equity securities:
United States companies	122		—		—		122
Investment funds(2)	56		—		—		56
Total assets measured at fair value	$	193	$	59	$	—	$	252
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 assets measured at fair value	$	186	$	63	$	—	$	249

(1) Refer to Note 14 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 70% and 30%, respectively, for 2016 and 68% and 32%, respectively, for 2015. Additionally, these funds are invested in United States and international securities of approximately 30% and 70%, respectively, for 2016 and 32% and 68%, respectively, for 2015.

For level 1 investments, a readily observable quoted market price or net asset value of an identical security in an active market is used to record the fair value. For level 2 investments, the fair value is determined using pricing models based on observable market inputs. Shares of mutual funds not registered under the Securities Act of 1933, private equity limited partnership interests, common and commingled trust funds and investment entities are reported at fair value based on the net asset value per unit, which is used for expedience purposes. A fund’s net asset value is based on the fair value of the underlying assets held by the fund less its liabilities.

MidAmerican Energy sponsors a defined contribution plan ("401(k) plan") covering substantially all employees. MidAmerican Energy's matching contributions are based on each participant's level of contribution, and certain participants receive contributions based on eligible pre-tax annual compensation. Contributions cannot exceed the maximum allowable for tax purposes. Certain participants now receive enhanced benefits in the 401(k) plan and no longer accrue benefits in the noncontributory defined benefit pension plans. MidAmerican Energy's contributions to the plan were $20 million, $20 million, and $19 million for the years ended December 31, 2016, 2015 and 2014, respectively.

MidAmerican Funding, LLC and Subsidiaries [Domain]

Defined Benefit Plan Disclosure [Line Items]

Employee Benefit Plans [Text Block]

Employee Benefit Plans

Refer to Note 11 of MidAmerican Energy's Notes to Financial Statements for additional information regarding MidAmerican Funding's pension, supplemental retirement and postretirement benefit plans.

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):

	2016			2015			2014
Pension costs	$	4		$	4		$	4
Other postretirement costs	(1		)	(2		)	(2		)