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Debt - Additional Information (Detail) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Sep. 30, 2014
Jul. 25, 2014
Jul. 25, 2014
Revolving Credit Agreement [Member]
Sep. 30, 2014
Revolving Credit Agreement [Member]
Sep. 30, 2014
Commercial Paper [Member]
Sep. 30, 2014
Minimum [Member]
Sep. 30, 2014
Maximum [Member]
Dec. 31, 2013
Revolving Credit Facility [Member]
CreditFacility
Sep. 30, 2014
Revolving Credit Facility [Member]
Sep. 30, 2014
Revolving Credit Facility [Member]
Line of Credit [Member]
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]
Sep. 30, 2014
Revolving Credit Facility 2016 [Member]
Sep. 30, 2014
Revolving Credit Facility 2016 [Member]
Line of Credit [Member]
Sep. 30, 2014
Revolving Credit Facility 2015 [Member]
Sep. 30, 2014
Revolving Credit Facility 2015 [Member]
Line of Credit [Member]
Sep. 30, 2014
Revolving Credit Facility 2014 [Member]
Line of Credit [Member]
Sep. 30, 2014
Credit Facility [Member]
Mar. 31, 2014
5.25% Convertible Notes Due March 15, 2014 [Member]
Sep. 30, 2014
5.125% Senior Notes Due 2024 [Member]
Debt Instrument [Line Items]                                                  
Principal amount of convertible notes $ 1,250,000,000     $ 1,250,000,000                                       $ 575,000,000  
Convertible notes, interest rate                                               5.25% 5.125%
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  
Proceeds from issuance of public debt offering       1,238,000,000                                          
Debt instrument redemption price percentage       101.00%                                          
Number of revolving credit facility agreements                     10                            
Limit of requested increases in lender commitments         500,000,000           1,190,000,000 200,000,000   150,000,000 150,000,000   50,000,000                
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 extended period                                   2016-09   2015-10          
Credit facility, term           5 years 5 years                                    
Line of credit facility, outstanding borrowings         4,000,000,000                                   0    
Letters of credit sublimit under credit facility         1,000,000,000                                        
Line of credit facility borrowing capacity 510,000,000 510,000,000 620,000,000 510,000,000                 1,040,000,000           300,000,000   400,000,000 340,000,000      
Extended credit facility maturity date       Jul. 25, 2019                                          
Fees paid to maintain credit facility               0.25%                                  
Extension of maturity period       1 year                                          
Applicable margin on LIBOR loans                 0.50% 1.50%                              
Debt instrument, maturity date             July 25, 2017                                    
Outstanding borrowings               3,750,000,000                                  
Agreement termination date       Jun. 25, 2014                                          
Amounts borrowed under the credit facility                                             0    
Line of credit facility, repayment $ 510,000,000 $ 510,000,000 $ 620,000,000                                            
Weighted-average interest rate 1.55% 1.55% 1.53%                                            
Weighted-average maturity days 73 days 84 days 49 days