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Long-term Incentive Compensation and Shareholders’ Equity - Summary of Status of Awards Under Stock-Based Compensation Plans and Agreements (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Stock Appreciation Rights (SARs) |  |  |
Awards |  |  |
Outstanding at beginning of year (in shares) | 6,953,000 |  |
Granted (in shares) | 2,765,000 |  |
Exercised (in shares) | (894,000) |  |
Expired (in shares) | (494,000) |  |
Canceled (in shares) | (246,000) |  |
Outstanding at end of period (in shares) | 8,084,000 | 6,953,000 |
Exercisable at end of period (in shares) | 987,000 |  |
Weighted-average fair value of grants | $ 26.70 | $ 14.04 | $ 16.24
Weighted average exercise price |  |  |
Outstanding at beginning of year (USD per share) | 64.10 |  |
Granted (USD per share) | 68.58 |  |
Exercised (USD per share) | 72.13 |  |
Expired (USD per share) | 83.61 |  |
Canceled (USD per share) | 61.36 |  |
Outstanding at end of period (USD per share) | 63.64 | $ 64.10 |
Exercisable at end of period (USD per share) | $ 69.56 |  |
Weighted average remaining contractual life |  |  |
Outstanding at end of period | 3 years |  |
Exercisable at end of period | 1 year |  |
Stock units |  |  |
Awards |  |  |
Outstanding at beginning of year (in shares) | 3,160,000 |  |
Granted (in shares) | 1,027,000 |  |
Added by performance factor (in shares) | 19,000 |  |
Exercised (in shares) | (351,000) |  |
Expired (in shares) | 0 |  |
Canceled (in shares) | (318,000) |  |
Outstanding at end of period (in shares) | 3,537,000 | 3,160,000 |
Exercisable at end of period (in shares) | 0 |  |
Weighted-average fair value of grants (USD per share) | $ 77.83 | $ 50.58 | $ 66.23
Weighted average remaining contractual life |  |  |
Outstanding at end of period | 1 year 9 months 18 days |  |
Exercisable at end of period | 0 years |  |

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of grants made 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://fasb.org/us-gaap/role/ref/legacyRef -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=120381028&loc=d3e5070-113901 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -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=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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