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Segments (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Apr. 01, 2021
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Segment
Subsidiaries
Sep. 30, 2020
USD ($)
Segments [Abstract]          
Number of reportable segments | Segment       4  
Number of individual operating subsidiaries | Subsidiaries       3  
Revenues [Abstract]          
Insurance premiums   $ 2,059 $ 1,953 $ 6,056 $ 5,672
Net investment income (loss)   483 540 1,649 1,347
Investment gains (losses) [1]   22 46 657 (1,312)
Non-insurance warranty revenue   357 317 1,054 926
Operating revenues and other   450 609 1,580 2,241
Total   3,371 3,465 10,996 8,874
Expenses [Abstract]          
Insurance claims and policyholders' benefits   1,632 1,616 4,684 4,683
Amortization of deferred acquisition costs   368 360 1,084 1,046
Non-insurance warranty expense   330 293 973 859
Operating expenses and other   638 876 2,208 3,894
Interest   99 137 324 404
Total   3,067 3,282 9,273 10,886
Income (loss) before income tax   304 183 1,723 (2,012)
Income tax (expense) benefit   (58) (21) (391) 284
Net income (loss)   246 162 1,332 (1,728)
Amounts attributable to noncontrolling interests   (26) (23) (97) 400
Net income (loss) attributable to Loews Corporation   220 139 1,235 (1,328)
Altium Packaging LLC [Member]          
Segments [Abstract]          
Percentage interest of subsidiary sold 47.00%        
Operating Segments [Member]          
Revenues [Abstract]          
Insurance premiums   2,059 1,953 6,056 5,672
Net investment income (loss)   483 540 1,649 1,347
Investment gains (losses)   22 46 657 (1,312)
Non-insurance warranty revenue   357 317 1,054 926
Operating revenues and other   450 609 1,580 2,241
Total   3,371 3,465 10,996 8,874
Expenses [Abstract]          
Insurance claims and policyholders' benefits   1,632 1,616 4,684 4,683
Amortization of deferred acquisition costs   368 360 1,084 1,046
Non-insurance warranty expense   330 293 973 859
Operating expenses and other   638 876 2,208 3,894
Interest   99 137 324 404
Total   3,067 3,282 9,273 10,886
Income (loss) before income tax   304 183 1,723 (2,012)
Income tax (expense) benefit   (58) (21) (391) 284
Net income (loss)   246 162 1,332 (1,728)
Amounts attributable to noncontrolling interests   (26) (23) (97) 400
Net income (loss) attributable to Loews Corporation   220 139 1,235 (1,328)
Operating Segments [Member] | CNA Financial [Member]          
Revenues [Abstract]          
Insurance premiums   2,059 1,953 6,056 5,672
Net investment income (loss)   513 517 1,608 1,380
Investment gains (losses)   22 46 117 (101)
Non-insurance warranty revenue   357 317 1,054 926
Operating revenues and other   8 7 19 20
Total   2,959 2,840 8,854 7,897
Expenses [Abstract]          
Insurance claims and policyholders' benefits   1,632 1,616 4,684 4,683
Amortization of deferred acquisition costs   368 360 1,084 1,046
Non-insurance warranty expense   330 293 973 859
Operating expenses and other   287 268 874 851
Interest   28 52 85 114
Total   2,645 2,589 7,700 7,553
Income (loss) before income tax   314 251 1,154 344
Income tax (expense) benefit   (59) (36) (219) (40)
Net income (loss)   255 215 935 304
Amounts attributable to noncontrolling interests   (26) (23) (97) (32)
Net income (loss) attributable to Loews Corporation   229 192 838 272
Operating Segments [Member] | Boardwalk Pipelines [Member]          
Revenues [Abstract]          
Operating revenues and other   307 289 991 926
Total   307 289 991 926
Expenses [Abstract]          
Operating expenses and other   215 219 641 633
Interest   40 44 121 127
Total   255 263 762 760
Income (loss) before income tax   52 26 229 166
Income tax (expense) benefit   (14) (6) (59) (43)
Net income (loss)   38 20 170 123
Net income (loss) attributable to Loews Corporation   38 20 170 123
Operating Segments [Member] | Loews Hotels & Co [Member]          
Revenues [Abstract]          
Net investment income (loss)       1  
Operating revenues and other   134 60 288 236
Total   134 60 289 236
Expenses [Abstract]          
Operating expenses and other   109 114 328 404
Interest   8 8 25 24
Total   117 122 353 428
Income (loss) before income tax   17 (62) (64) (192)
Income tax (expense) benefit   (4) 15 13 48
Net income (loss)   13 (47) (51) (144)
Net income (loss) attributable to Loews Corporation   13 (47) (51) (144)
Operating Segments [Member] | Corporate [Member]          
Revenues [Abstract]          
Net investment income (loss)   (30) 23 [2] 40 [3] (33) [2]
Investment gains (losses)       540 [3] (1,211) [2]
Operating revenues and other   1 253 [2] 282 [3] 754 [2]
Total   (29) 276 [2] 862 [3] (490) [2]
Expenses [Abstract]          
Operating expenses and other   27 275 [2] 365 [3] 810 [2]
Interest   23 33 [2] 93 [3] 96 [2]
Total   50 308 [2] 458 [3] 906 [2]
Income (loss) before income tax   (79) (32) [2] 404 [3] (1,396) [2]
Income tax (expense) benefit   19 6 [2] (126) [3] 293 [2]
Net income (loss)   (60) (26) [2] 278 [3] (1,103) [2]
Net income (loss) attributable to Loews Corporation   $ (60) $ (26) [2] $ 278 [3] (1,103) [2]
Operating Segments [Member] | Diamond Offshore [Member]          
Revenues [Abstract]          
Operating revenues and other [4]         305
Total [4]         305
Expenses [Abstract]          
Operating expenses and other [4]         1,196
Interest [4]         43
Total [4]         1,239
Income (loss) before income tax [4]         (934)
Income tax (expense) benefit [4]         26
Net income (loss) [4]         (908)
Amounts attributable to noncontrolling interests [4]         432
Net income (loss) attributable to Loews Corporation [4]         $ (476)
[1] During the three and nine months ended September 30, 2021, $2 of investment losses and $15 of investment gains were recognized due to the change in fair value of non-redeemable preferred stock still held as of September 30, 2021. During the three and nine months ended September 30, 2020, $25 of investment gains and $44 of investment losses were recognized due to the change in fair value of non-redeemable preferred stock still held as of September 30, 2020.
[2] Amounts presented for Corporate include the operating results of Altium Packaging prior to the deconsolidation.
[3] Amounts presented for Corporate include the operating results of Altium Packaging through March 31, 2021. Beginning April 1, 2021, Altium Packaging is recorded as an equity method investment.
[4] Amounts presented for Diamond Offshore reflect the period prior to the deconsolidation.