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FAIR VALUE OF FINANCIAL INSTRUMENTS
3 Months Ended
Mar. 31, 2016
FAIR VALUE OF FINANCIAL INSTRUMENTS [Line Items]  
FAIR VALUE OF FINANCIAL INSTRUMENTS
FAIR VALUE OF FINANCIAL INSTRUMENTS

The estimated fair values and carrying values of our long-term debt consisted of the following:
 
MARCH 31,
2016
DECEMBER 31,
2015
DOLLAR AMOUNTS IN MILLIONS
CARRYING 
VALUE
 
FAIR VALUE
(LEVEL 2)
 
CARRYING 
VALUE
 
FAIR VALUE
(LEVEL 2)
Long-term Debt – fixed rate
$
6,156

 
$
6,993

 
$
4,326

 
$
5,070

Long-term Debt – variable rate
1,647

 
1,650

 
549

 
550

Note Payable to Timberland Venture
835

 
843

 

 

Total Debt
$
8,638

 
$
9,486

 
$
4,875

 
$
5,620



To estimate the fair value of fixed rate long-term debt, we used the following valuation approaches:
market approach – based on quoted market prices we received for the same types and issues of our debt; or
income approach – based on the discounted value of the future cash flows using market yields for the same type and comparable issues of debt.

We believe that our variable rate long-term debt instruments have net carrying values that approximate their fair values with only insignificant differences.

The fair value of the Note Payable to Timberland Venture is estimated using a market approach based on quoted market prices we received for comparable issues of debt.

The inputs to these valuations are based on market data obtained from independent sources or information derived principally from observable market data. The difference between the fair value and the carrying value represents the theoretical net premium or discount we would pay or receive to retire all debt at the measurement date.

FAIR VALUE OF OTHER FINANCIAL INSTRUMENTS

We believe that our other financial instruments, including cash and cash equivalents, short-term investments, mutual fund investments held in grantor trusts, receivables, and payables, have net carrying values that approximate their fair values with only insignificant differences. This is primarily due to:
the short-term nature of these instruments,
carrying short-term investments at expected net realizable value,
the allowance for doubtful accounts.