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Nuclear Decommissioning Trust Fund
 6 Months Ended
Jun. 30, 2019
Nuclear Decommissioning Trust Fund Disclosure [Abstract]  
Nuclear Decommissioning Trust Fund Nuclear Decommissioning Trust Fund
NRG's Nuclear Decommissioning Trust Fund assets, which are for the decommissioning of its 44% interest in STP, are comprised of securities classified as available-for-sale and recorded at fair value based on actively quoted market prices. NRG accounts for the Nuclear Decommissioning Trust Fund in accordance with ASC 980, Regulated Operations, because the Company's nuclear decommissioning activities are subject to approval by the PUCT with regulated rates that are designed to recover all decommissioning costs and that can be charged to and collected from the ratepayers per PUCT mandate. Since the Company is in compliance with PUCT rules and regulations regarding decommissioning trusts and the cost of decommissioning is the responsibility of the Texas ratepayers, not NRG, all realized and unrealized gains or losses (including other-than-temporary impairments) related to the Nuclear Decommissioning Trust Fund are recorded to the Nuclear Decommissioning Trust liability and are not included in net income or accumulated OCI, consistent with regulatory treatment.
The following table summarizes the aggregate fair values and unrealized gains and losses for the securities held in the trust funds, as well as information about the contractual maturities of those securities.
 
As of June 30, 2019
 
As of December 31, 2018
(In millions, except maturities)
Fair Value
 
Unrealized Gains
 
Unrealized Losses
 
Weighted-average Maturities (In years)
 
Fair Value
 
Unrealized Gains
 
Unrealized Losses
 
Weighted-average Maturities (In years)
Cash and cash equivalents
$
25

 
$
—

 
$
—

 
—

 
$
19

 
$
—

 
$
—

 
—

U.S. government and federal agency obligations
57

 
4

 
—

 
12

 
46

 
1

 
—

 
12

Federal agency mortgage-backed securities
92

 
2

 
—

 
24

 
100

 
1

 
2

 
23

Commercial mortgage-backed securities
29

 
1

 
1

 
23

 
22

 
—

 
1

 
22

Corporate debt securities
102

 
5

 
—

 
11

 
96

 
1

 
2

 
11

Equity securities
439

 
291

 
—

 
—

 
376

 
231

 
1

 
—

Foreign government fixed income securities
4

 
—

 
—

 
8

 
4

 
—

 
—

 
9

Total
$
748

 
$
303

 
$
1

 
 
 
$
663

 
$
234

 
$
6

 
 

The following table summarizes proceeds from sales of available-for-sale securities and the related realized gains and losses from these sales. The cost of securities sold is determined on the specific identification method.
 
Six months ended June 30,
 
2019
 
2018
 
(In millions)
Realized gains
$
5

 
$
7

Realized losses
(5
)
 
(6
)
Proceeds from sale of securities
191


303