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COMMON STOCK (Tables) | 12 Months Ended
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Dec. 31, 2018
Equity [Abstract] |
Accelerated Share Repurchases | The following table summarizes the terms of the ASR agreements (dollars and shares in millions, except per share data):
|  |  |  | Initial Delivery |  | Final Settlement
Agreement Date |  | Amount Paid |  | Shares Received |  | Price per Share (a) |  | Value of Shares as % of Contract Value |  | Settlement Date |  | Total Shares Received |  | Average Price per Share (a)
February 2016 |  | $ | 325.0 |  |  | 3.2 |  |  | $ | 83.60 |  |  | 82 | % |  | April 2016 (tranche 1) |  | 1.8 |  |  | $ | 84.39 |
|  |  |  |  |  |  |  |  |  | October 2016 (tranche 2) |  | 1.7 |  |  | $ | 101.82 |
November 2017 |  | $ | 150.0 |  |  | 1.1 |  |  | $ | 109.86 |  |  | 80 | % |  | December 2017 |  | 1.3 |  |  | $ | 114.85 |
April 2018 |  | $ | 400.0 |  |  | 2.5 |  |  | $ | 127.36 |  |  | 80 | % |  | July 2018 |  | 2.8 |  |  | $ | 142.37 |
October 2018 |  | $ | 250.0 |  |  | 1.4 |  |  | $ | 139.22 |  |  | 80 | % |  | November 2018 |  | 1.7 |  |  | $ | 150.54 |
Schedule of Weighted-Average Assumptions for Options Granted | The Black-Scholes option pricing model was used with the following weighted-average assumptions for options granted during the following periods: Option Awards
| 2018 |  | 2017 |  | 2016
Average risk-free interest rate | 2.9 | % |  | 1.8 | % |  | 1.1 | %
Expected dividend yield | None |  |  | None |  |  | None |
Expected volatility | 29 | % |  | 33 | % |  | 33 | %
Expected life (years) | 5.0 |  |  | 4.6 |  |  | 4.5 |
Fair value, per share | $ | 42.51 |  |  | $ | 33.74 |  |  | $ | 31.00 |
Schedule of Weighted-Average Assumptions for ESPP Subscriptions | The Black-Scholes option pricing model was used with the following weighted-average assumptions for ESPP subscriptions granted during the following periods: ESPP
| 2018 |  | 2017 |  | 2016
Average risk-free interest rate | 0.9 | % |  | 0.5 | % |  | 0.3 | %
Expected dividend yield | None |  |  | None |  |  | None |
Expected volatility | 33 | % |  | 33 | % |  | 29 | %
Expected life (years) | 0.6 |  |  | 0.6 |  |  | 0.6 |
Fair value, per share | $ | 36.53 |  |  | $ | 25.69 |  |  | $ | 22.09 |
Schedule of Stock Option Activity | Stock option activity during the year ended December 31, 2018 under the Program and the Nonemployee Directors Program was as follows (in millions, except years and per-share amounts):
| Shares |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term |  | Aggregate Intrinsic Value
Outstanding as of December 31, 2017 | 8.7 |  |  | $ | 59.86 |  |  |  |  |  |
Options granted | 0.9 |  |  | 136.77 |  |  |  |  |  |
Options exercised | (2.3 | ) |  | 45.41 |  |  |  |  |  |
Options forfeited | (0.1 | ) |  | 97.57 |  |  |  |  |  |
Outstanding as of December 31, 2018 | 7.2 |  |  | 73.42 |  |  | 3.4 years |  | $ | 576.3 |
Exercisable as of December 31, 2018 | 5.0 |  |  | 55.63 |  |  | 2.5 years |  | 489.3 |
Vested and expected to vest as of December 31, 2018 | 6.9 |  |  | 71.60 |  |  | 3.3 years |  | 564.1 |
Schedule of Restricted Stock Unit Activity | The following table summarizes nonvested restricted stock unit activity during the year ended December 31, 2018 under the Program and the Nonemployee Directors Program (in millions, except per-share amounts):
| Shares |  | Weighted- Average Grant-Date Fair Value
Nonvested as of December 31, 2017 | 1.2 |  |  | $ | 85.23 |
Granted (a) | 0.4 |  |  | 130.29 |
Vested | (0.5 | ) |  | 59.41 |
Forfeited | (0.1 | ) |  | 92.64 |
Nonvested as of December 31, 2018 | 1.0 |  |  | 113.86 |
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(a) | Includes 42,025 shares of market-based restricted stock units granted during 2018, which represents the targeted number of shares to be issued, and 50,120 shares related to a previous year's grant of market-based restricted stock units since the payout percentage achieved at the end of the performance period was in excess of target. As described above, the actual number of shares ultimately issued is determined based on the Company's total stockholder return relative to a selected industry peer group.

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- Definition Tabular disclosure of accelerated share repurchase (ASR) programs. An ASR is a combination of transactions that permits an entity to purchase a targeted number of shares immediately with the final purchase price of those shares determined by an average market price over a fixed period of time. An accelerated share repurchase program is intended to combine the immediate share retirement benefits of a tender offer with the market impact and pricing benefits of a disciplined daily open market stock repurchase program. ASRs can be disclosed as part of stockholders' equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock 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) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: 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) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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