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Debt (Parenthetical) (Detail) - 3 months ended Sep. 30, 2019 € in Billions, $ in Billions | USD ($) | EUR (€)
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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 |

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