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Debt - Additional Information (Detail) (USD $)
6 Months Ended 6 Months Ended 1 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Dec. 31, 2012
Jun. 30, 2014
Revolving Credit Facility
Jun. 30, 2014
Commercial Paper
Minimum
Jun. 30, 2014
Commercial Paper
Maximum
Feb. 06, 2014
Tender Offer
Jan. 16, 2014
Tender Offer
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)
Floating Rate Notes
Tender Offer
Feb. 06, 2014
Cash Flow Hedges
Interest rate contracts
Tender Offer
Feb. 19, 2014
6.75% Notes
Jan. 16, 2014
2.250% Fixed Rate Notes
Tender Offer
Jan. 16, 2014
4.000% Fixed Rate Notes
Tender Offer
Debt Instrument [Line Items]                                    
Commercial paper, Maturity period           1 day 163 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)         35,000,000,000                          
Line of credit facility outstanding amount         0                          
Repayment of debt 2,516,000,000 1,749,000,000                           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 (493,000,000)             (493,000,000)                    
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 4.20%   4.80% 5.80%                            
Fair value of total debt 20,283,000,000   18,835,000,000                              
Carrying value of total debt $ 18,541,000,000   $ 17,121,000,000