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Accounting for Derivative Instruments and Hedging Activities (Tables)
12 Months Ended
Dec. 31, 2019
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 December 31, 2019 and 2018:
 
 
 
Total Volume
 
 
 
December 31, 2019
 
December 31, 2018
Commodity
Units
 
(In millions)
Natural Gas
MMBtu
 
2

 
1

Power
MWh
 
(2
)
 

Interest
Dollars
 
$
1,788

 
$
1,862


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 (a)
 
Derivative Liabilities
 
December 31, 2018
 
December 31, 2019
 
December 31, 2018
 
(In millions)
Derivatives Designated as Cash Flow Hedges:
 
 
 
 
 
Interest rate contracts current
$
2

 
$
3

 
$
1

Interest rate contracts long-term
3

 
11

 
6

Total Derivatives Designated as Cash Flow Hedges
5

 
14

 
7

Derivatives Not Designated as Cash Flow Hedges:
 
 
 
 
 
Interest rate contracts current
1

 
13

 
3

Interest rate contracts long-term
5

 
56

 
11

Commodity contracts long-term 

 
9

 

Total Derivatives Not Designated as Cash Flow Hedges
6

 
78

 
14

Total Derivatives
$
11

 
$
92

 
$
21


 
(a) Derivative Asset balances classified as current are included within the prepayments and other current assets line item of the Consolidated Balance Sheet.
Offsetting of derivatives by counterparty master agreement level and collateral received or paid The following tables summarize the offsetting of derivatives by counterparty master agreement level:

Gross Amounts Not Offset in the Statement of Financial Position
As of December 31, 2019
Gross Amounts of Recognized Assets/Liabilities
 
Derivative Instruments
 
Net Amount
Commodity contracts:
(In millions)
Derivative liabilities
(9
)
 
(1
)
 
(10
)
Total commodity contracts
(9
)
 
(1
)
 
(10
)
Interest rate contracts:
 
 
 
 
 
Derivative liabilities
(83
)
 
1

 
(82
)
Total interest rate contracts
(83
)
 
1

 
(82
)
Total derivative instruments
$
(92
)
 
$

 
$
(92
)
 
Gross Amounts Not Offset in the Statement of Financial Position
As of December 31, 2018
Gross Amounts of Recognized Assets/Liabilities
 
Derivative Instruments
 
Net Amount
Interest rate contracts:
 
 
 
 
 
Derivative assets
11

 
(1
)
 
10

Derivative liabilities
(21
)
 
1

 
(20
)
Total interest rate contracts
(10
)
 

 
(10
)
Total derivative instruments
$
(10
)
 
$

 
$
(10
)

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:
 
Year ended December 31,
 
2019
 
2018
 
2017
 
(In millions)
Accumulated OCL beginning balance
$
(38
)
 
$
(60
)
 
$
(70
)
Reclassified from accumulated OCL to income due to realization of previously deferred amounts
16

 
14

 
10

Mark-to-market of cash flow hedge accounting contracts
(9
)
 
8

 

Accumulated OCL ending balance, net of income tax benefit of $6, $7 and $9, respectively
$
(31
)
 
$
(38
)
 
$
(60
)
Accumulated OCL attributable to noncontrolling interests
(16
)
 
(20
)
 
(32
)
Accumulated OCL attributable to Clearway Energy, Inc.
$
(15
)
 
$
(18
)
 
$
(28
)
Losses expected to be realized from OCL during the next 12 months, net of income tax benefit of $3
$
(7
)