Risk Management and Hedging Activities (Tables)

6 Months Ended

Jun. 30, 2016

Derivative [Line Items]

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value

The following table, which reflects master netting arrangements and excludes contracts that have been designated as normal under the normal purchases or normal sales exception afforded by GAAP, summarizes the fair value of the Company's derivative contracts, on a gross basis, and reconciles those amounts to the amounts presented on a net basis on the Consolidated Balance Sheets (in millions):

	Other						Other			Other
	Current			Other			Current			Long-term
	Assets			Assets			Liabilities			Liabilities			Total
As of June 30, 2016
Not designated as hedging contracts:
Commodity assets(1)	$	24		$	75		$	14		$	1		$	114
Commodity liabilities(1)	(4		)	(1		)	(72		)	(156		)	(233		)
Interest rate assets	14			—			—			—			14
Interest rate liabilities	—			—			(11		)	(15		)	(26		)
Total	34			74			(69		)	(170		)	(131		)
Designated as hedging contracts:
Commodity assets	1			—			3			3			7
Commodity liabilities	—			—			(21		)	(11		)	(32		)
Interest rate assets	—			—			—			—			—
Interest rate liabilities	—			—			(5		)	(10		)	(15		)
Total	1			—			(23		)	(18		)	(40		)
Total derivatives	35			74			(92		)	(188		)	(171		)
Cash collateral receivable	—			—			23			58			81
Total derivatives - net basis	$	35		$	74		$	(69	)	$	(130	)	$	(90	)

	Other					Other			Other
	Current			Other		Current			Long-term
	Assets			Assets		Liabilities			Liabilities			Total
As of December 31, 2015
Not designated as hedging contracts:
Commodity assets(1)	$	25		$	72	$	7		$	2		$	106
Commodity liabilities(1)	(4		)	—		(113		)	(175		)	(292		)
Interest rate assets	7			—		—			—			7
Interest rate liabilities	—			—		(3		)	(6		)	(9		)
Total	28			72		(109		)	(179		)	(188		)
Designated as hedging contracts:
Commodity assets	—			—		1			2			3
Commodity liabilities	—			—		(33		)	(17		)	(50		)
Interest rate assets	—			3		—			—			3
Interest rate liabilities	—			—		(4		)	(1		)	(5		)
Total	—			3		(36		)	(16		)	(49		)
Total derivatives	28			75		(145		)	(195		)	(237		)
Cash collateral receivable	—			—		40			63			103
Total derivatives - net basis	$	28		$	75	$	(105	)	$	(132	)	$	(134	)

(1) The Company's commodity derivatives not designated as hedging contracts are generally included in regulated rates, and as of June 30, 2016 and December 31, 2015, a net regulatory asset of $185 million and $250 million, respectively, was recorded related to the net derivative liability of $119 million and $186 million, respectively. The difference between the net regulatory asset and the net derivative liability relates primarily to a power purchase agreement derivative at BHE Renewables.

Schedule of Regulatory Assets (Liabilities), Net, Unrealized Loss (Gain), Net, on Derivative Contracts

The following table reconciles the beginning and ending balances of the Company's net regulatory assets and summarizes the pre-tax gains and losses on commodity derivative contracts recognized in net regulatory assets, as well as amounts reclassified to earnings (in millions):

	Three-Month Periods						Six-Month Periods
	Ended June 30,						Ended June 30,
	2016			2015			2016			2015
Beginning balance	$	253		$	255		$	250		$	223
Changes in fair value recognized in net regulatory assets	(49		)	(3		)	(13		)	57
Net (losses) gains reclassified to operating revenue	(3		)	(2		)	(3		)	7
Net losses reclassified to cost of sales	(16		)	(17		)	(49		)	(54		)
Ending balance	$	185		$	233		$	185		$	233

Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss)

The following table reconciles the beginning and ending balances of the Company's accumulated other comprehensive (income) loss (pre-tax) and summarizes pre-tax gains and losses on commodity derivative contracts designated and qualifying as cash flow hedges recognized in other comprehensive income ("OCI"), as well as amounts reclassified to earnings (in millions):

	Three-Month Periods						Six-Month Periods
	Ended June 30,						Ended June 30,
	2016			2015			2016			2015
Beginning balance	$	72		$	27		$	46		$	32
Changes in fair value recognized in OCI	(28		)	25			20			17
Net gains reclassified to operating revenue	—			2			—			3
Net losses reclassified to cost of sales	(18		)	(16		)	(40		)	(14		)
Ending balance	$	26		$	38		$	26		$	38

Schedule of Notional Amounts of Outstanding Derivative Positions

The following table summarizes the net notional amounts of outstanding derivative contracts with fixed price terms that comprise the mark-to-market values as of (in millions):

	Unit of	June 30,		December 31,
	Measure	2016		2015
Electricity purchases	Megawatt hours	7		10
Natural gas purchases	Decatherms	311		317
Fuel purchases	Gallons	6		11
Interest rate swaps	US$	730		653
Mortgage sale commitments, net	US$	(464	)	(312	)

PacifiCorp [Member]

Derivative [Line Items]

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value

The following table, which reflects master netting arrangements and excludes contracts that have been designated as normal under the normal purchases or normal sales exception afforded by GAAP, summarizes the fair value of PacifiCorp's derivative contracts, on a gross basis, and reconciles those amounts to the amounts presented on a net basis on the Consolidated Balance Sheets (in millions):

	Other					Other			Other
	Current			Other		Current			Long-term
	Assets			Assets		Liabilities			Liabilities			Total
As of June 30, 2016
Not designated as hedging contracts(1):
Commodity assets	$	10		$	3	$	9		$	—		$	22
Commodity liabilities	(2		)	—		(34		)	(79		)	(115		)
Total	8			3		(25		)	(79		)	(93		)
Total derivatives	8			3		(25		)	(79		)	(93		)
Cash collateral receivable	—			—		13			55			68
Total derivatives - net basis	$	8		$	3	$	(12	)	$	(24	)	$	(25	)
As of December 31, 2015
Not designated as hedging contracts(1):
Commodity assets	$	10		$	—	$	2		$	—		$	12
Commodity liabilities	(1		)	—		(58		)	(89		)	(148		)
Total	9			—		(56		)	(89		)	(136		)
Total derivatives	9			—		(56		)	(89		)	(136		)
Cash collateral receivable	—			—		18			57			75
Total derivatives - net basis	$	9		$	—	$	(38	)	$	(32	)	$	(61	)

Schedule of Regulatory Assets (Liabilities), Net, Unrealized Loss (Gain), Net, on Derivative Contracts

The following table reconciles the beginning and ending balances of PacifiCorp's net regulatory assets and summarizes the pre-tax gains and losses on commodity derivative contracts recognized in net regulatory assets, as well as amounts reclassified to earnings (in millions):

	Three-Month Periods						Six-Month Periods
	Ended June 30,						Ended June 30,
	2016			2015			2016			2015
Beginning balance	$	144		$	130		$	133		$	85
Changes in fair value recognized in net regulatory assets	(45		)	(21		)	(19		)	27
Net gains reclassified to operating revenue	2			3			10			28
Net losses reclassified to energy costs	(12		)	(13		)	(35		)	(41		)
Ending balance	$	89		$	99		$	89		$	99

Schedule of Notional Amounts of Outstanding Derivative Positions

The following table summarizes the net notional amounts of outstanding commodity derivative contracts with fixed price terms that comprise the mark-to-market values as of (in millions):

	Unit of	June 30,		December 31,
	Measure	2016		2015
Electricity (sales) purchases	Megawatt hours	(2	)	1
Natural gas purchases	Decatherms	98		111
Fuel oil purchases	Gallons	6		11

MidAmerican Energy Company [Member]

Derivative [Line Items]

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value

The following table, which reflects master netting arrangements and excludes contracts that have been designated as normal under the normal purchases or normal sales exception afforded by GAAP, summarizes the fair value of MidAmerican Energy's derivative contracts, on a gross basis, and reconciles those amounts to the amounts presented on a net basis on the Balance Sheets (in millions):

	Other Current Assets		Other Assets		Other Current Liabilities			Other Long-term Liabilities			Total
As of June 30, 2016:
Not designated as hedging contracts(1)(2):
Commodity assets	$	6	$	—	$	2		$	—		$	8
Commodity liabilities	—		—		(8		)	(1		)	(9		)
Total	6		—		(6		)	(1		)	(1		)
Designated as hedging contracts(2):
Commodity assets	—		—		—			—			—
Commodity liabilities	—		—		—			—			—
Total	—		—		—			—			—
Total derivatives	6		—		(6		)	(1		)	(1		)
Cash collateral receivable	—		—		4			—			4
Total derivatives - net basis	$	6	$	—	$	(2	)	$	(1	)	$	3

As of December 31, 2015:
Not designated as hedging contracts(1):
Commodity assets	$	12		$	4	$	5		$	2		$	23
Commodity liabilities	(3		)	—		(36		)	(10		)	(49		)
Total	9			4		(31		)	(8		)	(26		)
Designated as hedging contracts:
Commodity assets	—			—		1			2			3
Commodity liabilities	—			—		(32		)	(17		)	(49		)
Total	—			—		(31		)	(15		)	(46		)
Total derivatives	9			4		(62		)	(23		)	(72		)
Cash collateral receivable	—			—		22			6			28
Total derivatives - net basis	$	9		$	4	$	(40	)	$	(17	)	$	(44	)

(1) MidAmerican Energy's commodity derivatives not designated as hedging contracts are generally included in regulated rates, and as of June 30, 2016 and December 31, 2015, a net regulatory asset of $3 million and $20 million, respectively, was recorded related to the net derivative liability of $1 million and $26 million, respectively.

Schedule of Regulatory Assets (Liabilities), Net, Unrealized Loss (Gain), Net, on Derivative Contracts

The following table reconciles the beginning and ending balances of MidAmerican Energy's net regulatory assets and summarizes the pre-tax gains and losses on commodity derivative contracts recognized in net regulatory assets, as well as amounts reclassified to earnings (in millions):

	Three-Month Periods						Six-Month Periods
	Ended June 30,						Ended June 30,
	2016			2015			2016			2015
Beginning balance	$	11		$	18		$	20		$	38
Changes in fair value recognized in net regulatory assets	(3		)	17			3			19
Net losses reclassified to operating revenue	(5		)	(6		)	(13		)	(22		)
Net losses reclassified to cost of gas sold	—			(1		)	(7		)	(7		)
Ending balance	$	3		$	28		$	3		$	28

Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss)

The following table reconciles the beginning and ending balances of MidAmerican Energy's accumulated other comprehensive loss (pre-tax) and summarizes pre-tax gains and losses on commodity derivative contracts designated and qualifying as cash flow hedges recognized in other comprehensive income ("OCI"), as well as amounts reclassified to earnings (in millions):

	Three-Month Periods					Six-Month Periods
	Ended June 30,					Ended June 30,
	2016		2015			2016			2015
Beginning balance	$	—	$	30		$	45		$	34
Transfer to affiliate	—		—			(45		)	—
Changes in fair value recognized in OCI	—		25			—			19
Net gains reclassified to nonregulated cost of sales	—		(16		)	—			(14		)
Ending balance	$	—	$	39		$	—		$	39

Schedule of Notional Amounts of Outstanding Derivative Positions

The following table summarizes the net notional amounts of outstanding commodity derivative contracts with fixed price terms that comprise the mark-to-market values as of (in millions):

	Unit of	June 30,	December 31,
	Measure	2016	2015
Electricity purchases	Megawatt hours	—	15
Natural gas purchases	Decatherms	13	17

Nevada Power Company [Member]

Derivative [Line Items]

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value

The following table, which excludes contracts that have been designated as normal under the normal purchases or normal sales exception afforded by GAAP, summarizes the fair value of Nevada Power's derivative contracts, on a gross basis, and reconciles those amounts to the amounts presented on a net basis on the Consolidated Balance Sheets (in millions):

	Other			Other
	Current			Long-term
	Liabilities			Liabilities			Total
As of June 30, 2016
Commodity liabilities(1)	$	(9	)	$	(13	)	$	(22	)
As of December 31, 2015
Commodity liabilities(1)	$	(8	)	$	(14	)	$	(22	)

(1) Nevada Power's commodity derivatives not designated as hedging contracts are included in regulated rates and as of June 30, 2016 and December 31, 2015, a regulatory asset of $22 million was recorded related to the derivative liability of $22 million.

Schedule of Notional Amounts of Outstanding Derivative Positions

The following table summarizes the net notional amounts of outstanding derivative contracts with indexed and fixed price terms that comprise the mark-to-market values as of (in millions):

	Unit of	June 30,		December 31,
	Measure	2016		2015
Electricity sales	Megawatt hours	(2	)	(2	)
Natural gas purchases	Decatherms	138		126