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Related Parties (Note Payable to EMC) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Jan. 21, 2014
Related Party Transaction [Line Items]            
Notes payable to EMC $ 1,500   $ 1,500   $ 1,500  
Interest Expense, Related Party $ 7 $ 7 $ 13 $ 12    
EMC            
Related Party Transaction [Line Items]            
Notes payable to EMC           $ 450
Notes payable | EMC            
Related Party Transaction [Line Items]            
Principal amount           1,500
Note, May 2018 | Notes payable | EMC            
Related Party Transaction [Line Items]            
Principal amount           $ 680
Interest rate           1.75%
Note, May 2020 | Notes payable | EMC            
Related Party Transaction [Line Items]            
Principal amount           $ 550
Interest rate           1.75%
Note, December 2022 | Notes payable | EMC            
Related Party Transaction [Line Items]            
Principal amount           $ 270
Interest rate           1.75%