Capital Stock (Changes in Common Stock Outstanding) (Details) - shares shares in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Changes in Common Stock Outstanding [Roll Forward]
Beginning Balance, January 1	180,354	180,140	179,724
Stock incentive plan net activity	716	986	952
Repurchase of common stock	(678)	(772)	(536)
Ending Balance, December 31	180,392	180,354	180,140

Number, after forfeiture, of shares or units issued under share-based payment arrangement. Excludes shares or units issued under employee stock ownership plan (ESOP).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 505
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-Section S99
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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