Schedule I - Condensed Financial Information of Registrant, Balance Sheets (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
ASSETS [Abstract]
Investments in securities	$ 44,646	$ 42,240
Other assets	3,069	3,145
Total assets	80,236	82,243
LIABILITIES AND SHAREHOLDERS' EQUITY [Abstract]
Long term debt	10,072	11,456
Total liabilities	61,055	60,313
Shareholders' equity	17,860	19,119
Total liabilities and equity	80,236	82,243
Loews Corporation [Member]
ASSETS [Abstract]
Current assets, principally investment in short term instruments	2,766	2,550
Investments in securities	775	734
Investments in capital stocks of subsidiaries, at equity	16,861	18,123
Other assets	22	24
Total assets	20,424	21,431
LIABILITIES AND SHAREHOLDERS' EQUITY [Abstract]
Current liabilities	63	77
Long term debt	2,276	1,779
Deferred income tax and other	225	456
Total liabilities	2,564	2,312
Shareholders' equity	17,860	19,119
Total liabilities and equity	$ 20,424	$ 21,431