FAIR VALUE MEASUREMENT
The Company classifies and discloses assets and liabilities carried at fair value in one of the following three categories:
Level 1: Quoted market prices in active markets for identical assets or liabilities.
Level 2: Observable market based inputs or unobservable inputs that are corroborated by market data.
Level 3: Unobservable inputs that are not corroborated by market data.
Items Measured at Fair Value

The carrying value of cash and cash equivalents, accounts receivable and short-term debt approximate fair value because of the short-term maturity of the instruments.

Derivatives
The Company executes financial derivative contracts for the purpose of mitigating risk exposure that is generated from our normal operations. These derivatives consist of natural gas swaps, interest rate swaps, cross currency swaps, and foreign exchange forward contracts, all of which are over-the-counter and not traded through an exchange. The Company uses widely accepted valuation tools to determine fair value, such as discounting cash flows to calculate a present value for the derivatives. The models use Level 2 inputs, such as forward curves and other commonly quoted observable transactions and prices.
The following table summarizes the fair values, and levels within the fair value hierarchy in which the fair value measurements fall, for assets and liabilities measured on a recurring basis as of December 31, 2016 (in millions):
 
Total
Measured
at Fair
Value
 
Quoted Prices
in Active
Markets for
Identical
Assets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Assets:
 
 
 
 
 
 
 
Derivative assets
$
16

 
$

 
$
16

 
$

Liabilities:
 
 
 
 
 
 
 
Derivative liabilities
$
2

 
$

 
$
2

 
$


The following table summarizes the fair values, and levels within the fair value hierarchy in which the fair value measurements fall, for assets and liabilities measured on a recurring basis as of December 31, 2015 (in millions):
 
Total
Measured
at Fair
Value
 
Quoted Prices
in Active
Markets for
Identical
Assets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Assets:
 
 
 
 
 
 
 
Derivative assets
$
14

 
$

 
$
14

 
$

Liabilities:
 
 
 
 
 
 
 
Derivative liabilities
$
6

 
$

 
$
6

 
$






Items Disclosed at Fair Value
Long-term debt
The following table shows the fair value of the Company’s long-term debt as calculated based on quoted market prices for the same or similar issues (Level 2 input), or on the current rates offered to the Company for debt of the same remaining maturities:
 
December 31, 2016
December 31, 2015
6.50% senior notes, net of discount, due 2016
%
103
%
9.00% senior notes, net of discount, due 2019
114
%
116
%
4.20% senior notes, net of discount, due 2022
104
%
99
%
4.20% senior notes, net of discount, due 2024
102
%
100
%
3.40% senior notes, net of discount, due 2026
95
%
%
7.00% senior notes, net of discount, due 2036
118
%
105
%
The Company determined that the book value of the remaining long-term debt instruments approximates market value.

Historical Timeline

Fiscal YearFiled
2016Feb 8, 2017Showing above
2015Feb 10, 2016

About Fair Value Disclosures

Fair value disclosures classify all assets and liabilities measured at fair value into a three-level hierarchy: Level 1 (quoted market prices), Level 2 (observable inputs like yield curves), and Level 3 (unobservable inputs requiring management estimates). The proportion of Level 3 assets directly reflects how much of the balance sheet depends on internal models rather than market evidence.

Key signals: a growing Level 3 balance relative to total fair-value assets increases valuation uncertainty and earnings volatility risk. Watch for transfers between levels — assets moving from Level 2 to Level 3 often signal deteriorating market liquidity. Unrealized gains and losses on Level 3 positions flow through earnings or other comprehensive income, so large swings deserve scrutiny. For financial institutions, examine the sensitivity disclosures that show how Level 3 valuations change under alternative assumptions. Compare the fair value of debt against its carrying amount to gauge hidden leverage.