Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments and Hedging Activities - Additional Information (Details)

v3.8.0.1
Derivative Instruments and Hedging Activities - Additional Information (Details) - USD ($)
 3 Months Ended 6 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2014
Nov. 30, 2014
Oct. 31, 2014
Senior notes            
Derivative            
Face amount         $ 2,500,000,000.0  
Senior notes due November 1, 2024 | Senior notes            
Derivative            
Face amount           $ 1,250,000,000
Stated interest rate 4.65% [1]         4.65%
Treasury lock | Senior notes | Cash flow hedge contracts | Derivatives designated as hedging instruments | Portion of senior notes            
Derivative            
Derivative, notional amount           $ 1,000,000,000.00
Unrealized gains (losses) on cash flow hedges       $ 7,500,000    
Treasury lock | Senior notes | Cash flow hedge contracts | Derivatives designated as hedging instruments | Portion of senior notes | Interest expense            
Derivative            
Unrealized gains (losses) on cash flow hedges $ 5,200,000          
Gain reclassified from accumulated OCI into income, effective portion $ 200,000 $ 200,000 $ 400,000      
[1] The effective interest rate disclosed above for this series of Senior Notes excludes the impact of the treasury rate lock hedge discussed below. The effective interest rate including the impact of the treasury rate lock hedge was 4.626%.