Debt (Parenthetical) (Detail) - 9 months ended Mar. 31, 2020 € in Billions, $ in Billions	USD ($)	EUR (€)
2009 Issuance of $3.8 billion
Debt Instrument [Line Items]
Debt, issuance date	2009
Debt, face value	$ 3.8
2010 Issuance of $4.8 billion
Debt Instrument [Line Items]
Debt, issuance date	2010
Debt, face value	$ 4.8
2011 Issuance of $2.3 billion
Debt Instrument [Line Items]
Debt, issuance date	2011
Debt, face value	$ 2.3
2012 Issuance of $2.3 billion
Debt Instrument [Line Items]
Debt, issuance date	2012
Debt, face value	$ 2.3
2013 Issuance of $5.2 billion
Debt Instrument [Line Items]
Debt, issuance date	2013
Debt, face value	$ 5.2
2013 Issuance of €4.1 billion
Debt Instrument [Line Items]
Debt, issuance date	2013
Debt, face value | €		€ 4.1
2014 Issuance
Debt Instrument [Line Items]
Debt, issuance date	2014
2015 Issuance of $23.8 billion
Debt Instrument [Line Items]
Debt, issuance date	2015
Debt, face value	$ 23.8
2016 Issuance of $19.8 billion
Debt Instrument [Line Items]
Debt, issuance date	2016
Debt, face value	$ 19.8
2017 Issuance of $17.0 billion
Debt Instrument [Line Items]
Debt, issuance date	2017
Debt, face value	$ 17.0