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Common Stock (Details) - USD ($)	3 Months Ended		234 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Dec. 31, 2020
Equity, Class of Treasury Stock [Line Items]
Common stock, outstanding	54,729,679		54,729,679	54,755,900
Common stock, issued	91,243	101,695
Common stock, dividend, per share	$ 0.13
Number of shares repurchased	100,000		17,700,000
Stock repurchased (in US dollars)	$ 12,917,000	$ 99,048,000	$ 917,000,000.0
Remaining authorized repurchase amount (in US dollars)	233,000,000.0		233,000,000.0
RepurchaseProgramSep2011toMar2021
Equity, Class of Treasury Stock [Line Items]
Stock repurchase, authorized amount (in US dollars)	$ 1,150,000,000		$ 1,150,000,000

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- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

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

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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