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Debt (Details 2) (USD $)
 12 Months Ended 0 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Credit agreements and commercial paper program
Dec. 31, 2012
Credit agreements and commercial paper program
Dec. 31, 2011
Credit agreements and commercial paper program
Aug. 31, 2013
Commercial Paper Program
Dec. 31, 2013
Fixed rate senior notes
Dec. 31, 2012
Fixed rate senior notes
Aug. 31, 2013
3.85% senior notes due October 2023
Dec. 31, 2012
2.85% senior notes due January 2023
Dec. 31, 2012
4.30% senior notes due January 2043
Mar. 31, 2012
3.65% senior notes due June 2022
Mar. 31, 2012
5.15% senior notes due June 2042
Dec. 13, 2013
5.63% senior notes due December 2013
Sep. 04, 2012
4.25% senior notes due September 2012
Feb. 07, 2011
7.75% senior notes due October 2012
Debt                                  
Debt instrument face value               $ 6,700,000,000 $ 6,300,000,000 $ 700,000,000 $ 400,000,000 $ 350,000,000 $ 750,000,000 $ 500,000,000      
Repayments of senior notes 250,000,000 500,000,000 200,000,000                       250,000,000 500,000,000  
Early redemption of senior notes                                 200,000,000
Debt instrument fair value               7,200,000,000 7,300,000,000                
Maximum aggregate amount outstanding at any time             1,500,000,000                    
Debt instrument, interest rate (as a percent)                   3.85% 2.85% 4.30% 3.65% 5.15% 5.63% 4.25% 7.75%
Percentage of face value at which senior notes are sold                   99.792% 99.752% 99.925% 99.823% 99.755%      
Consolidated subsidiary, ownership interest held by the parent (as a percent) 100.00%                                
Loss on early redemption of senior notes                                 23,000,000
Total borrowings       31,000,000,000 12,900,000,000 9,700,000,000                      
Total repayments       $ 31,000,000,000 $ 12,200,000,000 $ 10,900,000,000