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Long-Term Incentive Employee Compensation Rollforward of Outstanding Restricted Stock (Detail) - RSUs, PSUs and RSAs [Member] - $ / shares shares in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] |  |  |  |
Beginning Outstanding, shares |  | 1.1 | 1.3 | 1.1
Granted , shares |  | 0.5 | 0.5 | 0.5
Performance Adjustment, shares | [1] | 0.0 | (0.1) | 0.1
Lapsed, shares |  | (0.2) | (0.5) | (0.3)
Cancelled, shares |  | (0.2) | (0.1) | (0.1)
Ending Outstanding, shares |  | 1.2 | 1.1 | 1.3
Performance Units Vested Not Yet Issued |  | 0.1 | 0.0 | 0.3
Outstanding, Weighted Average Grant Date Fair Value |  | $ 38.24 | $ 36.56 | $ 31.70
Granted, Weighted Average Grant Date Fair Value |  | 42.52 | 33.28 | 41.34
Performance Adjustment, Weighted Average Grant Date Fair Value |  | 0 | 45.47 | 29.59
Lapsed, Weighted Average Grant Date Fair Value |  | 41.42 | 29.86 | 24.09
Canceled, Weighted Average Grant Date Fair Value |  | 41.75 | 39.20 | 35.89
Outstanding, Weighted Average Grant Date Fair Value |  | 38.74 | 38.24 | 36.56
Weighted Average Grant Date Fair Value of Performance Units Vested Not Yet Issued |  | $ 42.90 | $ 0 | $ 29.59
[1] | (a)Represents the adjustment to the number of shares to be issued above or below target for performance results achieved relative to PSUs granted in 2015 that vested on December 31, 2017, PSUs granted in 2014 that vested on December 31, 2016 and PSUs granted in 2013 that vested on December 31, 2015.

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- Definition Share Based Compensation Arrangement By Share Based Payment Award Equity Instrument Other Than Options Lapsed In Period Weighted Average Grant Date Fair Value. + References No definition available. + Details
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- Definition Weighted Average Grant Date Fair Value of Performance Units Vested Not Yet Issued + References No definition available. + Details
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- Definition Weighted Average Grant Date Fair Value of Performance Units with Performance Adjustment + 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=96867065&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&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=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + 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=96867065&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested 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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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)(iii)(2) -URI http://asc.fasb.org/extlink&oid=96867065&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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