Schedule I - Condensed Financial Information of Registrant - Parent Company Only, Balance Sheets (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
ASSETS
Other assets	$ 1,736	$ 1,699
Total assets	76,594	76,006
LIABILITIES AND SHAREHOLDERS' EQUITY
Total liabilities	53,233	53,196
Shareholders' equity	18,163	17,561
Total liabilities and equity	76,594	76,006
Loews Corporation [Member]
ASSETS
Current assets, principally investment in short term instruments	3,096	2,888
Investments in securities	1,931	1,487
Investments in capital stocks of subsidiaries, at equity	15,114	15,129
Other assets	389	97
Total assets	20,530	19,601
LIABILITIES AND SHAREHOLDERS' EQUITY
Current liabilities	140	260
Short term debt		400
Long term debt	1,775	1,279
Deferred income tax and other	452	101
Total liabilities	2,367	2,040
Shareholders' equity	18,163	17,561
Total liabilities and equity	$ 20,530	$ 19,601