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Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement of Comprehensive Income [Abstract]      
Net income $ 871 $ 706 $ 1,412
Other comprehensive income (loss), after tax Changes in:      
Net unrealized losses on investments with other-than-temporary impairments (1) (14) (5)
Net other unrealized gains (losses) on investments 949 (798) 108
Total unrealized gains (losses) on investments 948 (812) 103
Unrealized gains (losses) on cash flow hedges (11) 6 3
Pension and postretirement benefits (68) (2) 12
Foreign currency translation 42 (84) 100
Other comprehensive income (loss) 911 (892) 218
Comprehensive income (loss) 1,782 (186) 1,630
Amounts attributable to noncontrolling interests (38) 25 (269)
Total comprehensive income (loss) attributable to Loews Corporation $ 1,744 $ (161) $ 1,361