Debt - 2025 Notes - Additional Information (Detail) - 5.30% Senior Notes due in 2025 ("2025 Notes") [Member] $ in Millions |
1 Months Ended |
|---|---|
|
Aug. 31, 2017
USD ($)
| |
| Debt Instrument [Line Items] | |
| Principal amount of convertible senior notes | $ 1,800 |
| Proceeds from convertible senior notes, net of underwriting discounts and issuance costs | $ 1,770 |