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Share-Based Payments - Summary of Grants, Exchanges and Forfeitures of Restricted Stock and RSUs (Detail) - LTIP [Member] | 3 Months Ended
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Mar. 31, 2017 shares
Restricted Stock [Member] |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |
Outstanding, beginning of period (in shares) | 432,120,000
Outstanding, end of period (in shares) | 432,120,000
RSUs [Member] |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |
Outstanding, beginning of period (in shares) | 1,703,775,000
Outstanding, end of period (in shares) | 1,369,455,000
January 2017 [Member] | Restricted Stock [Member] |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |
Cancelled upon delivery (in shares) | 0
January 2017 [Member] | RSUs [Member] |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |
Cancelled upon delivery (in shares) | (332,349,000)
August 2016 [Member] | Restricted Stock [Member] |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |
Forfeiture (in shares) | 0
August 2016 [Member] | RSUs [Member] |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |
Forfeiture (in shares) | (1,971,000)

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Canceled Upon Delivery + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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