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Shareholders' Equity, Treasury Stock (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Treasury Stock [Abstract]
Purchases of Loews treasury stock (in shares)	5.6	9.7
Purchase of treasury stock	$ 274	$ 445

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Number of shares that have been repurchased during the period and are being held in treasury.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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