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Accounting for Derivative Instruments and Hedging Activities (Tables)
 9 Months Ended
Sep. 30, 2016
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:
 
 
 
Total Volume
 
 
 
September 30, 2016
 
December 31, 2015
Commodity
Units
 
(In millions)
Natural Gas
MMBtu
 
3

 
4

Interest
Dollars
 
$
1,875

 
$
1,991
Fair value within the derivative instrument valuation on the balance sheets
he following table summarizes the fair value within the derivative instrument valuation on the balance sheet:
 
Fair Value
 
Derivative Assets
 
Derivative Liabilities
 
September 30, 2016
 
September 30, 2016
 
December 31, 2015
 
(In millions)
Derivatives Designated as Cash Flow Hedges:
 
 
 
 
 
Interest rate contracts current
$
—

 
$
29

 
$
34

Interest rate contracts long-term
—

 
94

 
56

Total Derivatives Designated as Cash Flow Hedges
—

 
123

 
90

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

 
2

 
3

Interest rate contracts long-term
—

 
13

 
5

Commodity contracts current
1

 
1

 
2

Total Derivatives Not Designated as Cash Flow Hedges
1

 
16

 
10

Total Derivatives
$
1

 
$
139

 
$
100
Offsetting of derivatives by counterparty master agreement level and collateral received or paid
 
 
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 OCL balance attributable to interest rate swaps designated as cash flow hedge derivatives, net of tax:
 
Three months ended September 30,
 
Nine months ended September 30,
 
2016
 
2015 (a)
 
2016
 
2015 (a)
 
(In millions)
Accumulated OCL beginning balance
$
(140
)
 
$
(73
)
 
$
(83
)
 
$
(76
)
Reclassified from accumulated OCL to income due to realization of previously deferred amounts
4

 
5

 
10

 
12

Mark-to-market of cash flow hedge accounting contracts
17

 
(36
)
 
(46
)
 
(40
)
Accumulated OCL ending balance, net of income tax benefit of $29 and $19, respectively
(119
)
 
(104
)
 
(119
)
 
(104
)
Accumulated OCL attributable to noncontrolling interests
(71
)
 
(72
)
 
(71
)
 
(72
)
Accumulated OCL attributable to NRG Yield, Inc.
$
(48
)
 
$
(32
)
 
$
(48
)
 
$
(32
)
Losses expected to be realized from OCL during the next 12 months, net of income tax benefit of $4
$
16

 
 
 
$
16