Stockholders' Equity and Share-Based Awards - Additional Information (Detail) - USD ($)		6 Months Ended
Jun. 11, 2018	Jun. 30, 2018
Share Repurchase Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in authorized amount	$ 2,500,000,000
Stock repurchase program, authorized amount		$ 3,600,000,000
Share Repurchase Program [Member] \| Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program, shares repurchased		0
Stock repurchase program, value repurchased		$ 0
Performance Based Restricted Stock Units Rsu [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock units awarded		1,100,000
Share-based compensation arrangement by share-based payment award, award vesting period		3 years
Aggregate grant date fair value		$ 35,100,000
Time-Based RSU's [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock units awarded		1,500,000
Share-based compensation arrangement by share-based payment award, award vesting period		3 years
Aggregate grant date fair value		$ 41,800,000
Share-based awards vesting terms		Vest in equal installments over a three-year period.
Employees Awards [member] \| Discontinued Operations [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock units awarded		100,000
Aggregate grant date fair value		$ 3,300,000

Share-based compensation arrangement by share-based payment award aggregate grant date fair value.

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- Definition

Increase in amount authorized under the Company's board-approved share repurchase program.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Net number of non-option equity instruments granted to participants.

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- Definition

Description of pertinent provisions of equity-based compensation awards that have actual or potential impact upon the company's financial statements.

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Amount of stock repurchase plan authorized.

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Number of shares that have been repurchased during the period and are being held in treasury.

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- Definition

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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