Quarterly report pursuant to Section 13 or 15(d)

Debt - Senior Notes (Details)

v3.5.0.2
Debt - Senior Notes (Details) - USD ($)
3 Months Ended
Nov. 19, 2014
Sep. 30, 2016
Sep. 30, 2015
Jun. 30, 2016
Nov. 30, 2014
Oct. 31, 2014
Debt Instrument            
Cash dividends declared (in dollars per share)   $ 0.52 $ 0.52      
Unamortized discount   $ 3,209,000   $ 3,312,000    
Treasury lock | Derivatives designated as hedging instruments | Cash flow hedge contracts | Senior notes | Portion of senior notes            
Debt Instrument            
Notional amount of derivative           $ 1,000,000,000.00
Special cash dividend            
Debt Instrument            
Cash dividends declared (in dollars per share) $ 16.50          
Cash dividends $ 2,760,000,000          
Senior notes            
Debt Instrument            
Face amount         $ 2,500,000,000.0  
Unamortized discount         4,000,000  
Frequency of periodic payment   semi-annually        
Redemption price (as a percent)   101.00%        
Fair value disclosure   $ 2,710,000,000   $ 2,680,000,000    
Senior notes | Treasury lock | Derivatives Not Designated as Hedging Instruments | 2018 Senior Notes            
Debt Instrument            
Notional amount of derivative         $ 750,000,000  
Senior notes | Standard & Poor's, BBplus Rating            
Debt Instrument            
Decrease in credit rating, interest rate adjustment (in bps)   0.25%        
Senior notes | Standard & Poor's, BB Rating            
Debt Instrument            
Decrease in credit rating, interest rate adjustment (in bps)   0.50%        
Senior notes | Standard & Poor's, BB- Rating            
Debt Instrument            
Decrease in credit rating, interest rate adjustment (in bps)   0.75%        
Senior notes | Standard & Poor's, B Plus or Below            
Debt Instrument            
Decrease in credit rating, interest rate adjustment (in bps)   1.00%        
Senior notes | Moody's, Ba1 Rating            
Debt Instrument            
Decrease in credit rating, interest rate adjustment (in bps)   0.25%        
Senior notes | Moody's, Ba2 Rating            
Debt Instrument            
Decrease in credit rating, interest rate adjustment (in bps)   0.50%        
Senior notes | Moody's, Ba3 Rating            
Debt Instrument            
Decrease in credit rating, interest rate adjustment (in bps)   0.75%        
Senior notes | Moody's, B1 Rating            
Debt Instrument            
Decrease in credit rating, interest rate adjustment (in bps)   1.00%