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Basis of Presentation - Adoption on Segment Results of Operations (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Insurance claims and policyholders’ benefits $ 1,779 $ 1,601 $ 3,432 $ 3,079
Income before income tax 508 235 1,027 674
Income tax expense (120) (48) (235) (135)
Net income 388 187 792 539
Amounts attributable to noncontrolling interests (28) (20) (57) (50)
Net income attributable to Loews Corporation 360 167 735 489
Re-measurement gain of insurance claims and policyholders’ benefits $ (33) 1 $ (34) 6
CNA Financial        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Insurance claims and policyholders’ benefits   1,601   3,079
Income before income tax   227   582
Income tax expense   (37)   (97)
Net income   190   485
Amounts attributable to noncontrolling interests   (20)   (50)
Net income attributable to Loews Corporation   170   435
As Reported        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Insurance claims and policyholders’ benefits   1,583   3,038
Income before income tax   253   715
Income tax expense   (51)   (143)
Net income   202   572
Amounts attributable to noncontrolling interests   (22)   (54)
Net income attributable to Loews Corporation   180   518
As Reported | CNA Financial        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Insurance claims and policyholders’ benefits   1,583   3,038
Income before income tax   245   623
Income tax expense   (40)   (105)
Net income   205   518
Amounts attributable to noncontrolling interests   (22)   (54)
Net income attributable to Loews Corporation   183   464
Effect of Adoption        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Insurance claims and policyholders’ benefits   18   41
Income before income tax   (18)   (41)
Income tax expense   3   8
Net income   (15)   (33)
Amounts attributable to noncontrolling interests   2   4
Net income attributable to Loews Corporation   (13)   (29)
Effect of Adoption | CNA Financial        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Insurance claims and policyholders’ benefits   18   41
Income before income tax   (18)   (41)
Income tax expense   3   8
Net income   (15)   (33)
Amounts attributable to noncontrolling interests   2   4
Net income attributable to Loews Corporation   $ (13)   $ (29)