Share-Based Incentive Plan (Stock Awards) (Details) - $ / shares	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of shares under stock awards, outstanding at beginning of period	6,711,731	6,347,709	6,815,278
Weightedaverage exercise price per share, outstanding at beginning of period	$ 35.36	$ 36.97	$ 36.61
Number of shares under stock awards, granted		814,351	829,322
Weighted average exercise price per share, granted		$ 17.37	$ 26.18
Number of shares under stock awards, exercised		(27,615)	(580,950)
Weighted average exercise price per share, exercised		$ 21.13	$ 14.40
Number of shares under stock awards, forfeited	(1,135,241)	(422,714)	(715,941)
Weighted average exercise price per share, forfeited	$ 26.39	$ 25.74	$ 39.40
Number of shares under stock awards, outstanding at end of period	5,576,490	6,711,731	6,347,709
Weighted average exercise price per share, outstanding at end of period	$ 37.19	$ 35.36	$ 36.97
Number of shares under stock awards, vested and expected to vest at period end	5,487,788
Weighted average exercise price per share, vested and expected to vest at period end	$ 37.45
Number of shares under stock awards, exercisable at period end	4,969,602
Weighted average exercise price per share, exercisable at period end	$ 39.21

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Net number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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