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Shares of Common Stock Outstanding (Details) - Common Stock - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Stock Option Activity Rollforward [Abstract]
Balance, Beginning of Year (in shares)	198,663,342	223,743,322	229,443,008
Issuance Related to Stock-Based Compensation (in shares)	909,107	814,344	711,214
Retirement of Common Stock (in shares)	(12,929,487)	(25,894,324)	(6,410,900)
Balance, End of Year (in shares)	186,642,962	198,663,342	223,743,322

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Stock Option Activity Rollforward [Abstract]

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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

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Number of shares that have been repurchased and retired during the period.

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