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Risk Management and Hedging Activities (Tables)
 9 Months Ended
Sep. 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 September 30, 2016
 
 
 
 
 
 
 
 
 
Not designated as hedging contracts:
 
 
 
 
 
 
 
 
 
Commodity assets(1)
$
15

 
$
81

 
$
11

 
$
2

 
$
109

Commodity liabilities(1)
(3
)
 
—

 
(66
)
 
(164
)
 
(233
)
Interest rate assets
12

 
—

 
—

 
—

 
12

Interest rate liabilities
—

 
—

 
(6
)
 
(14
)
 
(20
)
Total
24

 
81

 
(61
)
 
(176
)
 
(132
)
 
 

 
 

 
 

 
 

 
 
Designated as hedging contracts:
 

 
 

 
 

 
 

 
 
Commodity assets
—

 
—

 
1

 
1

 
2

Commodity liabilities
—

 
—

 
(21
)
 
(16
)
 
(37
)
Interest rate assets
—

 
—

 
—

 
—

 
—

Interest rate liabilities
—

 
—

 
(4
)
 
(7
)
 
(11
)
Total
—

 
—

 
(24
)
 
(22
)
 
(46
)
 
 

 
 

 
 

 
 

 
 
Total derivatives
24

 
81

 
(85
)
 
(198
)
 
(178
)
Cash collateral receivable
—

 
—

 
20

 
65

 
85

Total derivatives - net basis
$
24

 
$
81

 
$
(65
)
 
$
(133
)
 
$
(93
)
 
 
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 September 30, 2016 and December 31, 2015, a net regulatory asset of $195 million and $250 million, respectively, was recorded related to the net derivative liability of $124 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
 
Nine-Month Periods
 
Ended September 30,
 
Ended September 30,
 
2016
 
2015
 
2016
 
2015
 
 
 
 
 
 
 
 
Beginning balance
$
185

 
$
233

 
$
250

 
$
223

Changes in fair value recognized in net regulatory assets
18

 
47

 
5

 
104

Net losses reclassified to operating revenue
(3
)
 
(11
)
 
(6
)
 
(4
)
Net losses reclassified to cost of sales
(5
)
 
(16
)
 
(54
)
 
(70
)
Ending balance
$
195

 
$
253

 
$
195

 
$
253
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
 
Nine-Month Periods
 
Ended September 30,
 
Ended September 30,
 
2016
 
2015
 
2016
 
2015
 
 
 
 
 
 
 
 
Beginning balance
$
26

 
$
38

 
$
46

 
$
32

Changes in fair value recognized in OCI
15

 
20

 
35

 
37

Net gains reclassified to operating revenue
1

 
1

 
1

 
4

Net losses reclassified to cost of sales
(7
)
 
(14
)
 
(47
)
 
(28
)
Ending balance
$
35

 
$
45

 
$
35

 
$
45
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
 
September 30,
 
December 31,
 
Measure
 
2016
 
2015
Electricity purchases
Megawatt hours
 
2

 
10

Natural gas purchases
Decatherms
 
321

 
317

Fuel purchases
Gallons
 
3

 
11

Interest rate swaps
US$
 
730

 
653

Mortgage sale commitments, net
US$
 
(375
)
 
(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 September 30, 2016
 
 
 
 
 
 
 
 
 
Not designated as hedging contracts(1):
 
 
 
 
 
 
 
 
 
Commodity assets
$
5

 
$
2

 
$
4

 
$
—

 
$
11

Commodity liabilities
(2
)
 
—

 
(27
)
 
(87
)
 
(116
)
Total
3

 
2

 
(23
)
 
(87
)
 
(105
)
 
 

 
 

 
 

 
 

 
 

Total derivatives
3

 
2

 
(23
)
 
(87
)
 
(105
)
Cash collateral receivable
—

 
—

 
14

 
59

 
73

Total derivatives - net basis
$
3

 
$
2

 
$
(9
)
 
$
(28
)
 
$
(32
)
 
 
 
 
 
 
 
 
 
 
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
 
Nine-Month Periods
 
 
Ended September 30,
 
Ended September 30,
 
 
2016
 
2015
 
2016
 
2015
 
 
 
 
 
 
 
 
 
Beginning balance
 
$
89

 
$
99

 
$
133

 
$
85

Changes in fair value recognized in net regulatory assets
 
15

 
38

 
(4
)
 
65

Net (losses) gains reclassified to operating revenue
 
(2
)
 
1

 
8

 
29

Net losses reclassified to energy costs
 
—

 
(10
)
 
(35
)
 
(51
)
Ending balance
 
$
102

 
$
128

 
$
102

 
$
128
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
 
September 30,
 
December 31,
 
Measure
 
2016
 
2015
Electricity (sales) purchases
Megawatt hours
 
(6
)
 
1

Natural gas purchases
Decatherms
 
92

 
111

Fuel oil purchases
Gallons
 
3

 
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 September 30, 2016:
 
 
 
 
 
 
 
 
 
Not designated as hedging contracts(1)(2):
 
 
 
 
 
 
 
 
 
Commodity assets
$
2

 
$
—

 
$
3

 
$
—

 
$
5

Commodity liabilities
—

 
—

 
(7
)
 
(2
)
 
(9
)
Total
2

 
—

 
(4
)
 
(2
)
 
(4
)
 
 
 
 
 
 
 
 
 
 
Designated as hedging contracts(2):
 
 
 
 
 
 
 
 
 
Commodity assets
—

 
—

 
—

 
—

 
—

Commodity liabilities
—

 
—

 
—

 
—

 
—

Total
—

 
—

 
—

 
—

 
—

 
 
 
 
 
 
 
 
 
 
Total derivatives
2

 
—

 
(4
)
 
(2
)
 
(4
)
Cash collateral receivable
—

 
—

 
1

 
—

 
1

Total derivatives - net basis
$
2

 
$
—

 
$
(3
)
 
$
(2
)
 
$
(3
)
 
Other Current
Assets
 
Other
Assets
 
Other Current
Liabilities
 
Other Long-
Term Liabilities
 
Total
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 September 30, 2016 and December 31, 2015, a net regulatory asset of $5 million and $20 million, respectively, was recorded related to the net derivative liability of $4 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
 
Nine-Month Periods
 
Ended September 30,
 
Ended September 30,
 
2016
 
2015
 
2016
 
2015
 
 
 
 
 
 
 
 
Beginning balance
$
3

 
$
28

 
$
20

 
$
38

Changes in fair value recognized in net regulatory assets
5

 
10

 
8

 
29

Net losses reclassified to operating revenue
(1
)
 
(12
)
 
(14
)
 
(34
)
Net losses reclassified to cost of gas sold
(2
)
 
(3
)
 
(9
)
 
(10
)
Ending balance
$
5

 
$
23

 
$
5

 
$
23
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
 
Nine-Month Periods
 
Ended September 30,
 
Ended September 30,
 
2016
 
2015
 
2016
 
2015
 
 
 
 
 
 
 
 
Beginning balance
$
—

 
$
39

 
$
45

 
$
34

Transfer to affiliate
—

 
—

 
(45
)
 
—

Changes in fair value recognized in OCI
—

 
21

 
—

 
40

Net gains reclassified to nonregulated cost of sales
—

 
(14
)
 
—

 
(28
)
Ending balance
$
—

 
$
46

 
$
—

 
$
46
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
 
September 30,
 
December 31,
 
Measure
 
2016
 
2015
 
 
 
 
 
 
Electricity purchases
Megawatt hours
 
—

 
15

Natural gas purchases
Decatherms
 
17

 
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 September 30, 2016
 
 
 
 
 
 
Commodity liabilities(1)
 
$
(9
)
 
$
(10
)
 
$
(19
)
 
 
 
 
 
 
 
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 September 30, 2016 and December 31, 2015, a regulatory asset of $19 million and $22 million, respectively, was recorded related to the derivative liability of $19 million and $22 million, respectively.
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
 
September 30,
 
December 31,
 
Measure
 
2016
 
2015
Electricity sales
Megawatt hours
 
(2
)
 
(2
)
Natural gas purchases
Decatherms
 
143

 
126