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Debt (Details 2) - USD ($)
$ in Millions
1 Months Ended 6 Months Ended
Jun. 30, 2015
Jan. 31, 2015
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Debt          
Repayments of senior notes     $ 149    
Outstanding letters of credit $ 63   63   $ 87
Senior unsecured 364-day revolving credit facility          
Debt          
Expiration period for credit facility   364 days      
Borrowing capacity 1,000 $ 1,000 $ 1,000    
Basis Variable interest rate used     Eurocurrency Rate or the Base Rate    
Credit agreements and commercial paper program          
Debt          
Total borrowings     $ 17,900 $ 34,600  
Total repayments     17,700 $ 34,900  
Senior notes          
Debt          
Debt instrument face value 9,200   9,200   9,300
Senior notes | Level 2          
Debt          
Debt instrument fair value 9,400   $ 9,400   $ 9,900
5.25% senior notes due June 2015          
Debt          
Repayments of senior notes $ 150