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Debt (Details 2) (USD $)
6 Months Ended
Apr. 23, 2014
Treasury locks entered into in anticipation of issuance of 4.70% senior notes due 2044
Jun. 30, 2014
Letters of credit
Dec. 31, 2013
Letters of credit
Jun. 30, 2014
Credit agreements and commercial paper program
Jun. 30, 2013
Credit agreements and commercial paper program
Jun. 30, 2014
Senior notes
Dec. 31, 2013
Senior notes
Jun. 30, 2014
Senior notes
Level 2
Dec. 31, 2013
Senior notes
Level 2
Apr. 23, 2014
4.70% senior notes due 2044
Debt                    
Debt instrument face value           $ 7,400,000,000 $ 6,700,000,000     $ 700,000,000
Debt instrument fair value               8,200,000,000 7,200,000,000  
Total borrowings       34,600,000,000 7,600,000,000          
Total repayments       34,900,000,000 7,800,000,000          
Outstanding letters of credit   38,000,000 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