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Debt (Details 2) (USD $)
 3 Months Ended
Apr. 30, 2014
Treasury locks entered into in anticipation of issuance of 4.70% senior notes due 2044
Subsequent Event
Mar. 31, 2014
Letters of credit
Dec. 31, 2013
Letters of credit
Mar. 31, 2014
Credit agreements and commercial paper program
Mar. 31, 2013
Credit agreements and commercial paper program
Mar. 31, 2014
Senior notes
Dec. 31, 2013
Senior notes
Apr. 30, 2014
4.70% senior notes due 2044
Subsequent Event
Debt                
Debt instrument face value           $ 6,700,000,000 $ 6,700,000,000 $ 700,000,000
Debt instrument fair value           7,300,000,000 7,200,000,000  
Total borrowings       19,200,000,000 3,200,000,000      
Total repayments       19,300,000,000 3,600,000,000      
Outstanding letters of credit   70,000,000 41,000,000          
Debt instrument, interest rate (as a percent)               4.70%
Percentage of face value at which senior notes are sold               99.734%
Notional amount of derivatives $ 250,000,000