Shareholders' Equity, Common Stock Dividends and Treasury Stock (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net Income Per Share [Abstract]
Common Stock, Dividends, Per Share, Declared	$ 0.25	$ 0.25	$ 0.25
Dividends paid (in dollars per share)	$ 0.25	$ 0.25	$ 0.25
Treasury Stock, Shares [Abstract]
Purchases of Loews treasury stock (in shares)	21.1	22.0	21.5
Purchases of Loews treasury stock (in usd)	$ 1,132	$ 917	$ 1,059
Treasury stock, retired (in shares)	21.2