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Debt - Additional Information (Detail) (USD $)
3 Months Ended 3 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Mar. 31, 2014
Revolving Credit Facility
Mar. 31, 2014
Commercial Paper
Minimum
Mar. 31, 2014
Commercial Paper
Maximum
Feb. 06, 2014
Tender Offer
Jan. 16, 2014
Tender Offer
Feb. 28, 2014
Tender Offer
Jan. 16, 2014
Tender Offer
Floating Rate Notes
Feb. 06, 2014
Tender Offer
7.000% Notes due in August 2037
Feb. 06, 2014
Tender Offer
6.875% Notes due in February 2038
Feb. 06, 2014
Tender Offer
6.875% Notes due in January 2039
Feb. 06, 2014
Tender Offer
6.500% Notes due in February 2040
Jan. 16, 2014
London Interbank Offered Rate (LIBOR)
Tender Offer
Floating Rate Notes
Feb. 06, 2014
Cash Flow Hedges
Interest rate contracts
Tender Offer
Jan. 16, 2014
2.250% Fixed Rate Notes
Tender Offer
Jan. 16, 2014
4.000% Fixed Rate Notes
Tender Offer
Feb. 19, 2014
6.75% Notes
Debt Instrument [Line Items]                                        
Commercial paper, Maturity period           1 day 227 days                          
Line of credit facility, maximum borrowing capacity         $ 4,500,000,000                              
Line of credit facility expiration date         Oct. 11, 2018                              
Revolving credit agreement debt covenant         24,600,000,000                              
Total shareholders' equity, excluding accumulated other comprehensive earnings / (losses)         34,800,000,000                              
Line of credit facility outstanding amount         0                              
Repayment of debt 2,514,000,000 752,000,000                                   500,000,000
Debt instrument interest rate                       7.00% 6.875% 6.875% 6.50%         6.75%
Cash tender offer amount               1,560,000,000                        
Debt instrument repurchased, principal amount               1,560,000,000       393,000,000 382,000,000 250,000,000 535,000,000          
Debt instrument expiration                       2037-08 2038-02 2039-01 2040-02          
Debt instrument, principal amount                 3,000,000,000   400,000,000             850,000,000 1,750,000,000  
Loss on extinguishment of debt (492,000,000)             (492,000,000)                        
Interest expense                                 2,000,000      
Debt instrument basis spread on variable rate                               0.52%        
Deb instrument maturity date                     Feb. 01, 2019             Feb. 01, 2019 Feb. 01, 2024  
Debt instrument, fixed interest rate                                   2.25% 4.00%  
Net proceeds from issuance of notes                 2,982,000,000                      
Discounts and deferred financing costs                   18,000,000                    
Weighted-average interest rate 4.14%   4.80% 5.80%                                
Fair value of total debt 20,569,000,000   18,835,000,000                                  
Carrying value of total debt $ 18,949,000,000   $ 17,121,000,000