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Financial Instruments (Notes)
12 Months Ended
Mar. 31, 2015
Fair Value Disclosures [Abstract]  
Financial Instruments
Financial Instruments
The carrying amount of cash and cash equivalents, accounts and notes receivable, and accounts payable approximates fair value. Short-term investments (consisting primarily of time deposits, commercial paper, and Treasury securities), totaling approximately $166 million and $1.2 billion as of March 31, 2015 and 2014, respectively, are recorded at amortized cost, and the respective carrying amounts approximate fair value primarily using quoted prices in active markets. The fair value of marketable equity securities totaling $40 million and $50 million as of the periods ended March 31, 2015 and 2014, respectively, are measured on a recurring basis using quoted prices in active markets. The estimated fair value of the majority of our current and long-term debt, excluding our credit facilities, is determined based on quoted prices in active markets or by using other observable inputs that are derived principally from, or corroborated by, observable market data.
The following table presents carrying amounts and estimated fair values of current and long-term debt:  
 
Carrying amount at March 31, 2015
 
Estimated Fair Value Using Input Type
 
 
Quoted prices in active markets
 
Observable
 
Unobservable
 
Total estimated fair value
 
(in millions)
Current and long-term debt
$
33,434

 
$
27,238

 
$
4,906

 
$
1,410

 
$
33,554

 
Carrying amount at March 31, 2014
 
Estimated Fair Value Using Input Type
 
 
Quoted prices in active markets
 
Observable
 
Unobservable
 
Total estimated fair value
 
(in millions)
Current and long-term debt
$
32,277

 
$
27,516

 
$
5,421

 
$
1,262

 
$
34,199