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Shareholders' Equity, Treasury Stock (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended
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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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