CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues:
Insurance premiums		$ 7,649	$ 7,428	$ 7,312
Net investment income		1,995	2,355	1,817
Investment gains (losses) (Note 2)	[1]	(1,246)	49	(57)
Non-insurance warranty revenue		1,252	1,161	1,007
Operating revenues and other		2,933	3,938	3,987
Total		12,583	14,931	14,066
Expenses:
Insurance claims and policyholders' benefits		6,170	5,806	5,572
Amortization of deferred acquisition costs		1,410	1,383	1,335
Non-insurance warranty expense		1,159	1,082	923
Operating expenses and other		4,793	4,950	4,828
Interest		515	591	574
Total		14,047	13,812	13,232
Income (loss) before income tax		(1,464)	1,119	834
Income tax (expense) benefit		173	(248)	(128)
Net income (loss)		(1,291)	871	706
Amounts attributable to noncontrolling interests		360	61	(70)
Net income (loss) attributable to Loews Corporation		$ (931)	$ 932	$ 636
Basic net income (loss) per share (in dollars per share)		$ (3.32)	$ 3.08	$ 1.99
Diluted net income per common share (in dollars per share)		$ (3.32)	$ 3.07	$ 1.99
Basic weighted average number of shares outstanding (in shares)		280,320	302,700	319,060
Diluted weighted average number of shares outstanding (in shares)		280,320	303,350	319,930

[1] Gross investment gains on available-for-sale securities were $220, $125 and $168 for the years ended December 31, 2020, 2019 and 2018. Gross investment losses on available-for-sale securities were $220, $131 and $164 for the years ended December 31, 2020, 2019 and 2018. For the year ended December 31, 2020, $3 of investment losses were recognized due to the change in fair value of non-redeemable preferred stock still held as of December 31, 2020. For the year ended December 31, 2019, $66 of investment gains were recognized due to the change in fair value of non-redeemable preferred stock still held as of December 31, 2019.