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Share-Based Compensation - Summary of Activity Under Share-Based Compensation Plans (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
SARs [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Awards Outstanding, Beginning Balance | 11,998 |  |
Granted, Awards | 1,345 |  |
Exercised, Awards | (481) |  |
Forfeited, Awards | (34) |  |
Awards Outstanding, Ending Balance | 12,828 |  | 11,998
Exercisable Awards, Ending Balance | 7,223 |  |
Weighted Average Exercise Price Outstanding, Beginning Balance | $ 41.52 |  |
Granted, Weighted Average Exercise Price | 57.19 |  |
Exercised, Weighted Average Exercise Price | 21.39 |  |
Forfeited, Weighted Average Exercise Price | 54.97 |  |
Weighted Average Exercise Price Outstanding, Ending Balance | 43.88 |  | $ 41.52
Exercisable, Weighted Average Exercise Price, Ending Balance | $ 39.34 |  |
Weighted Average Remaining Contractual Term Outstanding | 6 years 4 months 24 days |  | 6 years
Exercisable Weighted Average Remaining Contractual Term | 4 years 8 months 12 days |  |
Aggregate Intrinsic Value Outstanding | $ 211.4 |  | $ 148.7
Exercisable, Aggregate Intrinsic Value | $ 157.1 |  |
Granted, Weighted Average Grant Date Fair Value | $ 28.32 | $ 21.69 |
Incentive Plan and Independent Directors Stock Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Outstanding and nonvested December 31, 2016, Shares | 26 |  |
Vested, Shares | (1) |  |
Outstanding and nonvested March 31, 2017, Shares | 25 |  | 26
Outstanding and nonvested December 31, 2016, Weighted Average Grant Date Fair Value | $ 62.35 |  |
Vested, Weighted Average Grant Date Fair Value | 61.14 |  |
Outstanding and nonvested March 31, 2017, Weighted Average Grant Date Fair Value | $ 62.37 |  | $ 62.35

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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=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 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=6415400&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=6415400&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=6415400&loc=d3e5070-113901 + Details
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- Definition Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event. + 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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