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Basis of Presentation - Effects of Adoption of ASU 2018-12, Operations (Details) - USD ($)
$ / shares in Units, $ 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
Basic net income per share (in dollars per share) $ 1.58 $ 0.68 $ 3.19 $ 1.98
Diluted net income per share (in dollars per share) $ 1.58 $ 0.68 $ 3.19 $ 1.98
Re-measurement gain of insurance claims and policyholders’ benefits $ (33) $ 1 $ (34) $ 6
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
Basic net income per share (in dollars per share)   $ 0.73   $ 2.10
Diluted net income per share (in dollars per share)   $ 0.73   $ 2.09
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)
Basic net income per share (in dollars per share)   $ (0.05)   $ (0.12)
Diluted net income per share (in dollars per share)   $ (0.05)   $ (0.11)