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Fair Value of Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2020
Fair Value Disclosures [Abstract]  
Estimated Carrying Values and Fair Values
The estimated carrying amounts and fair values of the Company’s recorded financial instruments not carried at fair market value are as follows:
As of September 30, 2020As of December 31, 2019
Carrying AmountFair ValueCarrying AmountFair Value
(In millions)
Long-term debt, including current portion (a)
$6,797 $6,873 $6,858 $6,957 

(a) Excludes net debt issuance costs, which are recorded as a reduction to long-term debt on the Company's consolidated balance sheets.
Fair Value Option, Disclosures The following table presents the level within the fair value hierarchy for long-term debt, including current portion as of September 30, 2020 and December 31, 2019:
As of September 30, 2020As of December 31, 2019
Level 2Level 3Level 2Level 3
 (In millions)
Long-term debt, including current portion
$1,874 $4,999 $1,736 $5,221 
Schedule of Fair Value, Assets and Liabilities
The Company records its derivative assets and liabilities at fair value on its consolidated balance sheet. The following table presents assets and liabilities measured and recorded at fair value on the Company's consolidated balance sheets on a recurring basis and their level within the fair value hierarchy:
As of September 30, 2020As of December 31, 2019
Fair Value (a)
Fair Value (a)
(In millions)Level 2Level 3Level 2Level 3
Derivative liabilities:
Commodity contracts$— $17 $— $
Interest rate contracts169 — 83 — 
Total liabilities$169 $17 $83 $
(a) There were no derivative assets classified as Level 1, Level 2 or Level 3 and no liabilities classified as Level 1 as of September 30, 2020 and as of December 31, 2019.
The following table reconciles the beginning and ending balances for instruments that are recognized at fair value in the condensed consolidated financial statements using significant unobservable inputs:
 Three months ended September 30,
Nine months ended September 30,
2020
2019
20202019
(In millions)Fair Value Measurement Using Significant Unobservable Inputs (Level 3)Fair Value Measurement Using Significant Unobservable Inputs (Level 3)
Beginning balance$(17)$(7)$(9)$— 
Total losses for the period included in earnings— (2)(8)(2)
Purchases— — — (7)
Ending balance $(17)$(9)$(17)$(9)
Change in unrealized losses included in earnings for derivatives held as of September 30, 2020$— $
Fair Value Measurement Inputs and Valuation Techniques
The following tables quantify the significant unobservable inputs used in developing the fair value of the Company's Level 3 positions as of September 30, 2020:
September 30, 2020
Fair ValueInput/Range
AssetsLiabilitiesValuation TechniqueSignificant Unobservable InputLowHighWeighted Average
(In millions)
Power Contracts$— $(17)Discounted Cash FlowForward Market Price (per MWh)9.21 37.46 16.32 
The following table provides sensitivity of fair value measurements to increases/(decreases) in significant unobservable inputs as of September 30, 2020:
Significant Observable InputPositionChange In InputImpact on Fair Value Measurement
Forward Market Price PowerBuyIncrease/(Decrease)Higher/(Lower)
Forward Market Price PowerSellIncrease/(Decrease)Lower/(Higher)