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Notes Payable and Long-Term Debt (Details) - USD ($)
1 Months Ended
May. 25, 2016
Apr. 30, 2016
Debt Instrument [Line Items]    
Repurchased amount   $ 565,000,000
Loss on early retirement   261,000,000
Subsequent Event    
Debt Instrument [Line Items]    
Repurchased amount $ 824,000,000  
Loss on early retirement 160,000,000  
Unsecured Debt    
Debt Instrument [Line Items]    
Market value   820,000,000
Amount of debt repurchased   824,000,000
Unsecured Debt | Subsequent Event    
Debt Instrument [Line Items]    
Market value $ 981,000,000  
Unsecured Debt | Unsecured Fixed Rate 2.5 % Debt Maturing April 2026    
Debt Instrument [Line Items]    
Unsecured fixed rate debt   $ 1,000,000,000
Interest rate   2.50%
Unsecured Debt | Unsecured Fixed Rate 3.625 % Debt Maturing April 2046    
Debt Instrument [Line Items]    
Unsecured fixed rate debt   $ 1,000,000,000
Interest rate   3.625%