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
Sep. 30, 2017
Sep. 30, 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%
Cash flow hedge contracts | Treasury lock | Portion of senior notes | Senior notes | Derivatives designated as hedging instruments          
Derivative          
Derivative, notional amount         $ 1,000,000,000.00
Unrealized gains (losses) on cash flow hedges     $ 7,500,000    
Cash flow hedge contracts | Treasury lock | Portion of senior notes | Senior notes | Derivatives designated as hedging instruments | Interest expense          
Derivative          
Unrealized gains (losses) on cash flow hedges $ 5,300,000        
Gain reclassified from accumulated OCI into income, effective portion $ 200,000 $ 200,000      
[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%.