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Fair Value of Financial Investments
9 Months Ended
Sep. 30, 2016
Fair Value Disclosures [Abstract]  
Fair Value of Financial Investments
FAIR VALUE OF FINANCIAL INVESTMENTS
 
We have maintained investments in available-for-sale securities, equity method investments and a number of private equity funds, principally as part of our tax planning strategies, as any gains enhance the utilization of any current and future tax capital losses. Financial investments were as follows, in millions:
 
September 30, 2016
 
December 31, 2015
Prepaid expenses and other:
 
 
 
Auction rate securities
$
12

 
$

 
 
 
 
Other assets:
 
 
 
Auction rate securities

 
22

Equity method investments
14

 
13

Private equity funds
7

 
10

Other investments
3

 
3

Total
$
36

 
$
48


 

E. FAIR VALUE OF FINANCIAL INVESTMENTS (Concluded)

Recurring Fair Value Measurements.  Our auction rate securities are measured at fair value on a recurring basis, and have been estimated using a discounted cash flow model (Level 3 input).  The significant inputs in the discounted cash flow model used to value the auction rate securities include: expected maturity of auction rate securities, discount rate used to determine the present value of expected cash flows and the assumptions for credit defaults, since the auction rate securities are backed by credit default swap agreements.
 
In the second quarter of 2016, $10 million of our auction rate securities were called by our counterparty and redeemed at a value that approximated our recorded basis. Our investments in auction rate securities had a recorded basis of $12 million and $22 million at September 30, 2016 and December 31, 2015, respectively, which included cost basis of $10 million and $19 million and pre-tax unrealized gains of $2 million and $3 million at each respective date.
 
Non-Recurring Fair Value Measurements.  During the nine-month periods ended September 30, 2016 and 2015, we did not measure any financial investments at fair value on a non-recurring basis, as there was no other-than-temporary decline in the estimated value of these investments.
 
We did not have any transfers between Level 1 and Level 2 financial assets in the nine-month periods ended September 30, 2016 or 2015.
    
Realized Gains (Losses).  Income from financial investments, net, included in other, net, within other income (expense), net, was as follows, in millions: 
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2016
 
2015
 
2016
 
2015
Realized gains from auction rate securities
$

 
$

 
$
1

 
$

Realized gains from private equity funds
1

 
1

 
2

 
5

Equity investment income, net

 

 
1

 
2

Total income from financial investments, net
$
1

 
$
1

 
$
4

 
$
7


 
Fair Value of Debt.  The fair value of our short-term and long-term fixed-rate debt instruments is based principally upon modeled market prices for the same or similar issues or the current rates available to us for debt with similar terms and remaining maturities.  The aggregate estimated market value of short-term and long-term debt at September 30, 2016 was approximately $3.3 billion, compared with the aggregate carrying value of $3.0 billion.  The aggregate estimated market value of short-term and long-term debt at December 31, 2015 was approximately $3.6 billion, compared with the aggregate carrying value of $3.4 billion.