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Accounting for Derivative Instruments and Hedging Activities (Tables)
 12 Months Ended
Dec. 31, 2016
Accounting for Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Net notional volume buy/(sell) of NRG's open derivative transactions broken out by commodity
The following table summarizes the net notional volume buy/(sell) of NRG's open derivative transactions broken out by commodity, excluding those derivatives that qualified for the NPNS exception as of December 31, 2016 and 2015. Option contracts are reflected using delta volume. Delta volume equals the notional volume of an option adjusted for the probability that the option will be in-the-money at its expiration date.
 
 
Total Volume
Commodity
Units
December 31, 2016
 
December 31, 2015
 
 
(In millions)
Emissions
Short Ton
—

 
1

Coal
Short Ton
41

 
35

Natural Gas
MMBtu
85

 
293

Oil
Barrel
1

 
1

Power
MWh
(28
)
 
(74
)
Capacity
MW/Day
(1
)
 
(1
)
Interest
Dollars
$
3,429

 
$
2,326

Equity
Shares
1

 
1
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
(In millions)
December 31, 2016
 
December 31, 2015
 
December 31, 2016
 
December 31, 2015
Derivatives Designated as Cash Flow or Fair Value Hedges:
 
 
 
 
 
 
 
Interest rate contracts current
$
—

 
$
—

 
$
28

 
$
42

Interest rate contracts long-term
12

 
—

 
41

 
68

Total Derivatives Designated as Cash Flow or Fair Value Hedges
12

 
—

 
69

 
110

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

 
—

 
7

 
5

Interest rate contracts long-term
37

 
—

 
12

 
13

Commodity contracts current
1,062

 
1,915

 
1,049

 
1,674

Commodity contracts long-term
140

 
305

 
241

 
412

Total Derivatives Not Designated as Cash Flow or Fair Value Hedges
1,239

 
2,220

 
1,309

 
2,104

Total Derivatives
$
1,251

 
$
2,220

 
$
1,378

 
$
2,214
Offsetting of derivatives by counterparty master agreement level and collateral received or paid
The following table summarizes the offsetting derivatives by counterparty master agreement level and collateral received or paid:
 
Gross Amounts Not Offset in the Statement of Financial Position
 
Gross Amounts of Recognized Assets/Liabilities
 
Derivative Instruments
 
Cash Collateral (Held)/Posted
 
Net Amount
As of December 31, 2016
(In millions)
Commodity contracts:
 
 
 
 
 
 
 
Derivative assets
$
1,202

 
$
(1,005
)
 
$
(1
)
 
$
196

Derivative liabilities
(1,290
)
 
1,005

 
14

 
(271
)
Total commodity contracts
(88
)

—

 
13

 
(75
)
Interest rate contracts:
 
 
 
 
 
 
 
Derivative assets
49

 
(4
)
 
—

 
45

Derivative liabilities
(88
)
 
4

 
—

 
(84
)
Total interest rate contracts
(39
)
 
—

 
—

 
(39
)
Total derivative instruments
$
(127
)
 
$
—

 
$
13

 
$
(114
)
 
Gross Amounts Not Offset in the Statement of Financial Position
 
Gross Amounts of Recognized Assets/Liabilities
 
Derivative Instruments
 
Cash Collateral (Held)/Posted
 
Net Amount
As of December 31, 2015
(In millions)
Commodity contracts:
 
 
 
 
 
 
 
Derivative assets
$
2,220

 
$
(1,616
)
 
$
(113
)
 
$
491

Derivative liabilities
(2,086
)
 
1,616

 
271

 
(199
)
Total commodity contracts
134

 
—

 
158

 
292

Interest rate contracts:
 
 
 
 
 
 
 
Derivative liabilities
(128
)
 
—

 
—

 
(128
)
Total derivative instruments
$
6


$
—


$
158

 
$
164
Effects of ASC 815 on the Company's accumulated OCI balance attributable to cash flow hedge derivatives, net of tax
The following tables summarize the effects on NRG's accumulated OCI balance attributable to cash flow hedge derivatives, net of tax:
 
Year Ended December 31, 2016
 
Interest
Rate
 
Total
 
(In millions)
Accumulated OCI balance at December 31, 2015
$
(101
)
 
$
(101
)
Reclassified from accumulated OCI to income:
 
 
 
Due to realization of previously deferred amounts
21

 
21

Mark-to-market of cash flow hedge accounting contracts
14

 
14

Accumulated OCI balance at December 31, 2016, net of $16 tax
$
(66
)
 
$
(66
)
Losses expected to be realized from other comprehensive loss during the next 12 months, net of $4 tax
$
(16
)
 
$
(16
)
There were no gains or losses recognized in income from the ineffective portion of cash flow hedges for the year ended December 31, 2016.
 
Year Ended December 31, 2015
 
Energy
Commodities
 
Interest
Rate
 
Total
 
(In millions)
Accumulated OCI balance at December 31, 2014
$
(1
)
 
$
(67
)
 
$
(68
)
Reclassified from accumulated OCI to income:
 
 
 
 
 
Due to realization of previously deferred amounts
1

 
14

 
15

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

 
(48
)
 
(48
)
Accumulated OCI balance at December 31, 2015, net of $16 tax
$
—

 
$
(101
)
 
$
(101
)
There were no gains or losses recognized in income from the ineffective portion of cash flow hedges for the year ended December 31, 2015.
 
Year Ended December 31, 2014
 
Energy
Commodities
 
Interest
Rate
 
Total
 
(In millions)
Accumulated OCI balance at December 31, 2013
$
(1
)
 
$
(22
)
 
$
(23
)
Reclassified from accumulated OCI to income:
 
 
 
 
 
Due to realization of previously deferred amounts
—

 
13

 
13

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

 
(58
)
 
(58
)
Accumulated OCI balance at December 31, 2014, net of $35 tax
$
(1
)
 
$
(67
)
 
$
(68
)

There were no gains or losses recognized in income from the ineffective portion of cash flow hedges for the year ended December 31, 2014.
Pre-tax effects of economic hedges that have not been designated as cash flow hedges, ineffectiveness on cash flow hedges and trading activity on the Company's statement of operations
The following table summarizes the pre-tax effects of economic hedges that have not been designated as cash flow hedges, ineffectiveness on cash flow hedges, and trading activity on the Company's statement of operations. The effect of commodity hedges is included within operating revenues and cost of operations and the effect of interest rate hedges is included in interest expense.
 
Year Ended December 31,
 
2016
 
2015
 
2014
 
(In millions)
Unrealized mark-to-market results
 
 
 
 
 
Reversal of previously recognized unrealized gains on settled positions related to economic hedges
$
(245
)
 
$
(275
)
 
$
(15
)
Reversal of acquired gain positions related to economic hedges
(60
)
 
(106
)
 
(333
)
Net unrealized gains on open positions related to economic hedges
20

 
9

 
361

Total unrealized mark-to-market (losses)/gains for economic hedging activities
(285
)
 
(372
)
 
13

Reversal of previously recognized unrealized losses/(gains) on settled positions related to trading activity
10

 
(46
)
 
1

Reversal of acquired gain positions related to trading activity
—

 
(14
)
 
(32
)
Net unrealized gains/(losses) on open positions related to trading activity
18

 
(16
)
 
45

Total unrealized mark-to-market gains/(losses) for trading activity
28

 
(76
)
 
14

Total unrealized (losses)/gains
$
(257
)
 
$
(448
)
 
$
27

 
Year Ended December 31,
 
2016
 
2015
 
2014
 
(In millions)
Unrealized (losses)/gains included in operating revenues
$
(837
)
 
$
(320
)
 
$
515

Unrealized gains/(losses) included in cost of operations
580

 
(128
)
 
(488
)
Total impact to statement of operations — energy commodities
$
(257
)
 
$
(448
)
 
$
27

Total impact to statement of operations — interest rate contracts
$
36

 
$
17

 
$
(31
)