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Employee Stock and Savings Plans (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of assumptions used to determine fair value of stock options granted | The fair values of stock options granted were estimated on the date of grant using a binomial option-pricing model with the following assumptions:
| 2018 |  | 2017 |  | 2016
Expected life (in years) | 6.3 |  |  | 6.3 |  |  | 6.4 |
Average risk-free interest rate | 2.2 | % |  | 2.2 | % |  | 1.9 | %
Expected volatility | 28.3 | % |  | 28.9 | % |  | 29.3 | %
Expected dividend yield | 0 | % |  | 0 | % |  | 0 | %
Summary of stock option activity | A summary of stock option activity is as follows:
| Shares (In thousands) |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value (In millions)
Stock options outstanding - December 31, 2017 | 13,791 |  |  | $ | 28.17 |  |  |  |  |
Granted | 1,283 |  |  | 70.11 |  |  |  |  |
Forfeited | (332 | ) |  | 57.65 |  |  |  |  |
Exercised | (2,690 | ) |  | 18.62 |  |  |  |  |
Stock options outstanding - December 31, 2018 | 12,052 |  |  | $ | 33.96 |  |  | 5.2 |  | $ | 477 |
Stock options exercisable - December 31, 2018 | 9,319 |  |  | $ | 26.20 |  |  | 4.3 |  | $ | 441 |
Summary of restricted stock unit an performance share unit activity | A summary of restricted stock and performance share unit activity is as follows:
|  | Restricted Stock Units |  | Performance Share Units
|  | Shares (In thousands) |  | Weighted- Average Grant Date Fair Value |  | Shares (In thousands) |  | Weighted- Average Grant Date Fair Value
Units - December 31, 2017 |  | 1,942 |  |  | $ | 44.35 |  |  | 402 |  |  | $ | 52.16 |
Granted |  | 569 |  |  | 71.13 |  |  | 164 |  |  | 75.40 |
Forfeited |  | (173 | ) |  | 54.72 |  |  | (42 | ) |  | 55.42 |
Vested |  | (517 | ) |  | 39.03 |  |  | — |  |  | — |
Units - December 31, 2018 |  | 1,821 |  |  | $ | 53.22 |  |  | 524 |  |  | $ | 57.60 |
Schedule of additional information related to stock option and restricted stock unit activity | The table below presents additional information related to stock option and restricted stock unit activity:
(In millions) |  | 2018 |  | 2017 |  | 2016
Total intrinsic value of stock options exercised |  | $ | 147 |  |  | $ | 116 |  |  | $ | 113 |
Fair value of restricted stock units vested |  | 37 |  |  | 61 |  |  | 58 |
Income tax benefit from stock options exercised and restricted stock units vested |  | 43 |  |  | 66 |  |  | 62 |
Cash received from stock options exercised |  | 29 |  |  | 36 |  |  | 39 |

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- Definition Schedule of Share-based Compensation, Restricted Stock, Restricted Stock Units, Performance Shares and Performance Share Units Activity [Table Text Block] + References No definition available. + Details
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- Definition Tabular disclosure for share-based compensation 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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