Quarterly report pursuant to Section 13 or 15(d)

Debt - Senior Notes (Details)

v3.8.0.1
Debt - Senior Notes (Details) - USD ($)
3 Months Ended 9 Months Ended
Nov. 19, 2014
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2014
Mar. 31, 2018
Mar. 31, 2017
Jun. 30, 2017
Nov. 30, 2014
Oct. 31, 2014
Debt Instrument                  
Cash dividends declared (in dollars per share)   $ 0.59 $ 0.54   $ 1.77 $ 1.6      
Unamortized discount   $ 2,614,000     $ 2,614,000   $ 2,901,000    
Portion of senior notes | Derivatives designated as hedging instruments | Treasury lock | Senior notes | Cash flow hedge contracts                  
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  
Redemption price         101.00%        
Fair value disclosure   $ 2,350,000,000     $ 2,350,000,000   $ 2,670,000,000    
Senior notes | Standard & Poor's, BB plus Rating                  
Debt Instrument                  
Decrease in credit rating, interest rate adjustment (in bps)         25.00%        
Senior notes | Standard & Poor's, BB Rating                  
Debt Instrument                  
Decrease in credit rating, interest rate adjustment (in bps)         50.00%        
Senior notes | Standard & Poor's, BB- Rating                  
Debt Instrument                  
Decrease in credit rating, interest rate adjustment (in bps)         75.00%        
Senior notes | Standard & Poor's, B Plus or Below                  
Debt Instrument                  
Decrease in credit rating, interest rate adjustment (in bps)         100.00%        
Senior notes | Moody's, Ba1 Rating                  
Debt Instrument                  
Decrease in credit rating, interest rate adjustment (in bps)         25.00%        
Senior notes | Moody's, Ba2 Rating                  
Debt Instrument                  
Decrease in credit rating, interest rate adjustment (in bps)         50.00%        
Senior notes | Moody's, Ba3 Rating                  
Debt Instrument                  
Decrease in credit rating, interest rate adjustment (in bps)         75.00%        
Senior notes | Moody's, B1 Rating                  
Debt Instrument                  
Decrease in credit rating, interest rate adjustment (in bps)         100.00%        
Senior notes | 2018 Senior Notes | Derivatives Not Designated as Hedging Instruments | Treasury lock                  
Debt Instrument                  
Face amount               $ 750,000,000