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Debt - Additional Information (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended 3 Months Ended
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Revolving Credit Facility [Member]
CreditFacility
Mar. 31, 2014
Revolving Credit Facility [Member]
First Loans Agreement [Member]
Mar. 31, 2014
Revolving Credit Facility [Member]
Second Loans Agreement [Member]
Mar. 31, 2014
Revolving Credit Facility [Member]
Third Loans Agreement [Member]
Mar. 31, 2014
Revolving Credit Facility [Member]
Eleventh Revolving Credit Facility Agreement [Member]
Mar. 31, 2014
5.25% Convertible Notes, Due 2014 [Member]
Debt Instrument [Line Items]                
Principal amount of convertible notes               $ 575
Convertible notes, interest rate               5.25%
Convertible notes due date               Mar. 15, 2014
Number of shares, option exercised               89
Conversion rate, numerator               155.4908
Conversion rate, denominator               $ 1,000
Convertible notes, conversion price               $ 6.43
Par value of issued shares               $ 89
Number of revolving credit facility agreements     10          
Outstanding borrowings     1,190 150 150   50  
Revolving credit facility term start     2014-02          
Revolving credit facility term end     2015-12          
Line of credit facility, expiration date       2014-02 2014-03 2016-03 2016-02  
Extended credit facility maturity date       2015-03        
Line of credit facility, new agreement date           2014-04    
Line of credit facility, borrowing 510 620            
Line of credit facility, repayment $ 510 $ 620            
Weighted-average interest rate 1.55% 1.53%            
Weighted-average maturity days 84 days 49 days