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Debt (Detail) - Senior Notes [Member] € in Millions, $ in Millions | Jun. 30, 2019 USD ($) | Jun. 30, 2019 EUR (€)
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INA Senior Note Due June 2027 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Face Amount | $ 650 | € 575
Debt Instrument, Interest Rate, Stated Percentage | 0.875% | 0.875%
Make Whole Premium Additional Percent | 0.20% | 0.20%
INA Senior Note Due June 2031 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Face Amount | $ 650 | € 575
Debt Instrument, Interest Rate, Stated Percentage | 1.40% | 1.40%
Make Whole Premium Additional Percent | 0.25% | 0.25%
INA Senior Note Due June 2019 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Face Amount | $ 500 |
Debt Instrument, Interest Rate, Stated Percentage | 5.90% | 5.90%

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