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Consolidated Condensed Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 396	$ 380
Other comprehensive income (loss), after tax Changes in:
Net unrealized gains (losses) on investments with other-than-temporary impairments	4	(9)
Net other unrealized gains (losses) on investments	526	(429)
Total unrealized gains (losses) on investments	530	(438)
Unrealized gains (losses) on cash flow hedges	(6)	10
Pension liability	8	10
Foreign currency translation	17	11
Other comprehensive income (loss)	549	(407)
Comprehensive income (loss)	945	(27)
Amounts attributable to noncontrolling interests	(61)	(43)
Total comprehensive income (loss) attributable to Loews Corporation	$ 884	$ (70)

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