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Share-Based Compensation - Summary of Activities Under Share-Based Compensation Plans (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Outstanding and nonvested as of December 31, 2017, Number of Shares | 326 |
Granted, Number of Shares | 1,386 |
Vested, Number of Shares | (44) |
Forfeited, Number of Shares | (57) |
Outstanding and nonvested as of December 31, 2018, Shares | 1,611 | 326
Number of Shares, Expected to vest as of December 31, 2018 | 1,111 |
Outstanding and nonvested as of December 31, 2017, Weighted Average Grant Date Fair Value Per Share | $ 34.34 |
Granted, Weighted Average Grant Date Fair Value Per Share | 43.75 |
Vested, Weighted Average Grant Date Fair Value Per Share | 35.62 |
Forfeited, Weighted Average Grant Date Fair Value Per Share | 43.15 |
Outstanding and nonvested as of December 31, 2018, Weighted Average Grant Date Fair Value Per Share | 42.09 | $ 34.34
Expected to vest as of December 31, 2018, Weighted Average Grant Date Fair Value Per Share | $ 43.47 |
SARs [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of Awards Outstanding, Beginning Balance | 19,193 |
Exercised, Number of Awards | (10,369) |
Forfeited, Number of Awards | (354) |
Number of Awards Outstanding, Ending Balance | 8,470 | 19,193
Number of Awards Exercisable, Ending Balance | 5,220 |
Number of Awards Vested and expected to vest, Ending Balance | 8,279 |
Weighted Average Exercise Price Per Award Outstanding, Beginning Balance | $ 23.36 |
Exercised, Weighted Average Exercise Price Per Award | 20.34 |
Forfeited, Weighted Average Exercise Price Per Award | 28.91 |
Weighted Average Exercise Price Per Award Outstanding, Ending Balance | 26.82 | $ 23.36
Exercisable, Weighted Average Exercise Price Per Award, Ending Balance | 25.03 |
Weighted Average Exercise Price Per Award, Vested and expected to vest, Ending Balance | $ 26.76 |
Weighted Average Remaining Contractual Term Outstanding | 6 years 1 month 6 days | 6 years 2 months 12 days
Exercisable Weighted Average Remaining Contractual Term | 5 years |
Weighted Average Remaining Contractual Term, Vested and expected to vest | 6 years |
Aggregate Intrinsic Value Outstanding | $ 272.1 | $ 212.0
Exercisable, Aggregate Intrinsic Value | 177.1 |
Aggregate Intrinsic Value, Vested and expected to vest | $ 266.5 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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