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Subsequent Events - Additional Information (Detail) - 6.75% Series B Mandatory Convertible Preferred Stock [Member] - USD ($) $ / shares in Units, $ in Millions	Jul. 15, 2019	Jul. 26, 2016
Subsequent Event [Member]
Subsequent Event [Line Items]
Depository shares issued		5,200,000
Percentage of issued shares		6.75%
Offering price per share		$ 100
Proceeds from offering, net		$ 502
Scenario, Forecast [Member] | Minimum [Member]
Subsequent Event [Line Items]
Preferred stock converted in to common stock	120.46
Number of common stock issued upon conversion	6,200,000
Scenario, Forecast [Member] | Maximum [Member]
Subsequent Event [Line Items]
Preferred stock converted in to common stock	132.50
Number of common stock issued upon conversion	6,900,000

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Preferred stock converted in to common stock.

+ References

No definition available.

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- Definition

Preferred stock shares issued percentage.

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- Definition

Number of shares issued for each share of convertible preferred stock that is converted.

+ References

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-Name Accounting Standards Codification
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-SubTopic 10
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- Definition

Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

+ References

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- Definition

The cash inflow associated with the amount received from entity's first offering of stock to the public.

+ References

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- Definition

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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