Share-based Compensation - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of authorized common stock shares under LTIP, as amended	51,500,000
Number of shares under LTIP, as amended, available for issuance of restricted common shares, performance share units and stock options	19,000,000
Unearned compensation expense, before income taxes due 2019	$ 57
Unearned compensation expense, before income taxes due 2020	30
Unearned compensation expense, before income taxes due 2021	$ 6
Performance of predetermined peer companies	3 years
Outstanding stock options	5,200,000
Number of stock options, exercisable	3,900,000
Weighted average remaining contractual term - Outstanding	4 years 3 months 18 days
Weighted average remaining contractual life for options, exercisable	2 years 10 months 24 days
Aggregated intrinsic value	$ 0
Aggregated intrinsic value for exercisable options	$ 0
Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period from date of grant, in years	3 years
Performance Share Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period from date of grant, in years	3 years
Minimum PSU awards payout	0.00%
Maximum PSU awards payout	200.00%
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period from date of grant, in years	3 years
Contractual term of stock options	10 years
Outstanding stock options	5,170,000	6,482,000
Weighted average remaining contractual term - Outstanding	4 years 3 months 18 days	3 years 7 months 6 days

Employee service share based compensation unrecognized compensation costs on nonvested awards due within three years.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Employee service share based compensation unrecognized compensation costs on nonvested awards due within two years.

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Maximum award payout percentage.

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Minimum award payout percentage.

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Period for comparison of total shareholder return.

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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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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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