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Debt Notes and Debentures (Details) - USD ($)
$ in Millions
Apr. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]        
Debt, fair value   $ 21,310   $ 20,543
Debt, book value   20,165   $ 18,471
Additional Debt Securities Authorized For Issuance By The Board of Managers $ 3,000      
Remaining Debt Securities Authorized by the Board   3,250    
Corporate Debt Securities | Three Point Zero Zero Zero Percent Debentures Due April 1, 2025 [Member]        
Debt Instrument [Line Items]        
Debt instrument issued amount     $ 500  
Debt Instrument interest rate     3.00%  
Corporate Debt Securities | Four Point One Five Zero Percent Debentures Due April 1, 2045 [Member]        
Debt Instrument [Line Items]        
Debt instrument issued amount     $ 1,000  
Debt Instrument interest rate     4.15%  
Junior Subordinated Debt        
Debt Instrument [Line Items]        
Subordinated notes related to financial covenants   500    
Equipment Trust Certificate [Member] | Three Point Four Four Two Percent 13-Year Equipment Obligation [Member]        
Debt Instrument [Line Items]        
Debt instrument issued amount   $ 500    
Debt Instrument interest rate   3.442%