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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan |
|  | Second Quarter |  |  |  | First Six Months |  |
|  | 2020 |  | 2019 |  | 2020 |  | 2019
|  | ($ in millions) |  |  |  |  |  |
Stock-based compensation expense |  | $ | 10 |  |  | $ | 20 |  |  | $ | 12 |  |  | $ | 36 |
Total tax benefit |  | 3 |  |  | 8 |  |  | 29 |  |  | 31 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | During 2020, a committee of nonemployee members of our Board of Directors (and the Chief Executive Officer when delegated authority by such committee) granted stock options, restricted stock units (RSUs) and performance share units (PSUs) pursuant to the Long-Term Incentive Plan (LTIP), as follows:
|  | Second Quarter |  |  |  | First Six Months |  |
|  | Granted |  | Weighted-Average Grant-Date Fair Value |  | Granted |  | Weighted-Average Grant-Date Fair Value
Stock options |  | 1,050 |  |  | $ | 39.10 |  |  | 43,770 |  |  | $ | 52.05 |
RSUs |  | 3,380 |  |  | 173.56 |  |  | 167,540 |  |  | 210.02 |
PSUs |  | 1,930 |  |  | 184.47 |  |  | 78,720 |  |  | 212.67 |
Schedule of Cash Proceeds Received from Share-based Payment Awards |
|  | Second Quarter |  |  |  | First Six Months |  |
|  | 2020 |  | 2019 |  | 2020 |  | 2019
|  | ($ in millions) |  |  |  |  |  |
Stock options exercised |  | 162,400 |  | 215,546 |  |  | 685,638 |  |  | 621,917 |
Cash received upon exercise |  | $ | 12 |  |  | $ | 16 |  |  | $ | 55 |  |  | $ | 44 |
Related tax benefit realized |  | 3 |  |  | 6 |  |  | 16 |  |  | 15 |
Restricted Stock Units (RSUs) |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Compensation, Activity |
|  | Second Quarter |  |  |  | First Six Months |  |
|  | 2020 |  | 2019 |  | 2020 |  | 2019
|  | ($ in millions) |  |  |  |  |  |
RSUs vested |  | — |  |  | 506 |  |  | 202,299 |  |  | 166,055 |
Common Stock issued net of tax withholding |  | — |  |  | 363 |  |  | 143,712 |  |  | 119,244 |
Related tax benefit realized |  | $ | — |  |  | $ | — |  |  | $ | 4 |  |  | $ | 2 |
Performance Share Units |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Compensation, Activity |
|  | First Six Months |  |
|  | 2020 |  | 2019
|  | ($ in millions) |  |
PSUs earned |  | 235,935 |  |  | 331,099
Common Stock issued net of tax withholding |  | 156,450 |  |  | 221,241
Related tax benefit realized |  | $ | 7 |  |  | $ | 9 |

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- Definition Tabular disclosure of cash received from exercise of stock options and similar instruments granted under share-based payment arrangements and tax benefit from exercise of stock options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120381028&loc=SL79508275-113901 + Details
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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + 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=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, 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 (e) -URI http://asc.fasb.org/extlink&oid=120381028&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 (c)(2) -URI http://asc.fasb.org/extlink&oid=120381028&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 (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the weighted-average grant-date fair value of equity options or other equity instruments granted during the year. + 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)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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