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Share-Based Compensation Plans (Tables) | 6 Months Ended
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Jun. 30, 2019
Share-based Payment Arrangement [Abstract] |
Amounts of Share-Based Compensation Cost Recorded in Consolidated Statement of Income | The following table provides the amounts of share-based compensation cost recorded in the Condensed Consolidated Statement of Income:
| Three Months Ended June 30, |  | Six Months Ended June 30,
($ in millions) | 2019 |  | 2018 |  | 2019 |  | 2018
Pretax share-based compensation expense | $ | 111 |  |  | $ | 90 |  |  | $ | 204 |  |  | $ | 170 |
Income tax benefit | (15 | ) |  | (13 | ) |  | (28 | ) |  | (28 | )
Total share-based compensation expense, net of taxes | $ | 96 |  |  | $ | 77 |  |  | $ | 176 |  |  | $ | 142 |
Assumptions Used to Determine Weighted-Average Fair Value of Options Granted | The weighted-average fair value of options granted during the first six months of 2019 and 2018 was $10.63 and $8.19 per option, respectively, and was determined using the following assumptions:
| Six Months Ended June 30,
| 2019 |  | 2018
Expected dividend yield | 3.2 | % |  | 3.4 | %
Risk-free interest rate | 2.4 | % |  | 2.8 | %
Expected volatility | 18.7 | % |  | 19.1 | %
Expected life (years) | 5.9 |  |  | 6.1 |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901 + 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=116856206&loc=d3e5070-113901 + Details
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