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Accounting for Derivative Instruments and Hedging Activities (Tables)
 3 Months Ended
Mar. 31, 2014
Accounting for Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Net notional volume buy/(sell) of NRG Yield's open derivative transactions broken out by commodity
The following table summarizes the net notional volume buy/(sell) of the Company's open derivative transactions broken out by commodity as of March 31, 2014 and December 31, 2013.
 
 
Total Volume
 
 
March 31, 2014
 
December 31, 2013
Commodity
Units
(In millions)
Natural Gas
MMBtu
3

 
2

Interest
Dollars
$
791

 
$
802
Fair value within the derivative instrument valuation on the balance sheets
The following table summarizes the fair value within the derivative instrument valuation on the balance sheet:
 
Fair Value
 
Derivative Assets
 
Derivative Liabilities
 
March 31, 2014
 
December 31, 2013
 
March 31, 2014
 
December 31, 2013
 
(In millions)
Derivatives Designated as Cash Flow Hedges:
 
 
 
 
 
 
 
Interest rate contracts current
$
—

 
$
—

 
$
18

 
$
18

Interest rate contracts long-term
3

 
5

 
18

 
16

Total Derivatives Designated as Cash Flow Hedges
3

 
5

 
36

 
34

Derivatives Not Designated as Cash Flow Hedges:
 
 
 
 
 
 
 
Interest rate contracts current
—

 
—

 
3

 
3

Interest rate contracts long-term
4

 
6

 
1

 
—

Commodity contracts current
1

 
1

 
1

 
2

Commodity contracts long-term
—

 
—

 
1

 
—

Total Derivatives Not Designated as Cash Flow Hedges
5

 
7

 
6

 
5

Total Derivatives
$
8

 
$
12

 
$
42

 
$
39
Offsetting of derivatives by counterparty master agreement level and collateral received or paid
The following table summarizes the offsetting of derivatives by counterparty master agreement level:
 
Gross Amounts Not Offset in the Statement of Financial Position
 
Gross Amounts of Recognized Assets/Liabilities
 
Derivative Instruments
 
Net Amount
As of March 31, 2014
(In millions)
Commodity contracts:
 
 
 
 
 
Derivative assets
$
1

 
$
—

 
$
1

Derivative liabilities
$
(2
)
 
$
—

 
$
(2
)
Total commodity contracts
(1
)
 
—

 
(1
)
Interest rate contracts:
 
 
 
 
 
Derivative assets
7

 
(4
)
 
3

Derivative liabilities
(40
)
 
4

 
(36
)
Total interest rate contracts
(33
)
 
—

 
(33
)
Total derivative instruments
$
(34
)
 
$
—

 
$
(34
)

 
Gross Amounts Not Offset in the Statement of Financial Position
As of December 31, 2013
Gross Amounts of Recognized Assets/Liabilities
 
Derivative Instruments
 
Net Amount
Commodity contracts:
(In millions)
Derivative assets
$
1

 
$
—

 
$
1

Derivative liabilities
(2
)
 
—

 
(2
)
Total commodity contracts
(1
)
 
—

 
(1
)
Interest rate contracts:
 
 
 
 
 
Derivative assets
11

 
(4
)
 
7

Derivative liabilities
(37
)
 
4

 
(33
)
Total interest rate contracts
(26
)
 
—

 
(26
)
Total derivative instruments
(27
)
 
—

 
$
(27
)
Effects of NRG Yield's accumulated OCI balance attributable to interest rate swaps designated as cash flow hedge derivatives, net of tax
The following table summarizes the effects on the Company’s accumulated other comprehensive loss, or OCL, balance attributable to interest rate swaps designated as cash flow hedge derivatives, net of tax:
 
Three months ended March 31,
 
2014
 
2013
 
(In millions)
Accumulated OCL beginning balance
$
(1
)
 
$
(24
)
Reclassified from accumulated OCL to income due to realization of previously deferred amounts
1

 
2

Mark-to-market of cash flow hedge accounting contracts
(7
)
 
(1
)
Accumulated OCL ending balance, net of income tax benefit of $3 and $15, respectively
$
(7
)
 
$
(23
)
Accumulated OCL attributable to noncontrolling interest
(5
)
 
 
Accumulated OCL attributable to NRG Yield, Inc.
$
(2
)