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Segments (Details) $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Apr. 01, 2021 | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) Subsidiaries Segment | Jun. 30, 2020 USD ($)
Segments [Abstract] |  |  |  |  |  |  |  |  |
Number of reportable segments | Segment |  |  |  |  |  | 4 |  |  |
Number of individual operating subsidiaries | Subsidiaries |  |  |  |  |  | 3 |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |
Insurance premiums |  |  | $ 2,035 | $ 1,850 |  | $ 3,997 |  | $ 3,719 |
Net investment income (loss) |  |  | 616 | 644 |  | 1,166 |  | 807 |
Investment gains (losses) | [1] |  | 578 | (1,142) |  | 635 |  | (1,358) |
Non-insurance warranty revenue |  |  | 359 | 308 |  | 697 |  | 609 |
Operating revenues and other |  |  | 415 | 650 |  | 1,130 |  | 1,632 |
Total |  |  | 4,003 | 2,310 |  | 7,625 |  | 5,409 |
Expenses [Abstract] |  |  |  |  |  |  |  |  |
Insurance claims and policyholders' benefits |  |  | 1,546 | 1,642 |  | 3,052 |  | 3,067 |
Amortization of deferred acquisition costs |  |  | 357 | 342 |  | 716 |  | 686 |
Non-insurance warranty expense |  |  | 332 | 285 |  | 643 |  | 566 |
Operating expenses and other |  |  | 656 | 992 |  | 1,570 |  | 3,018 |
Interest |  |  | 100 | 123 |  | 225 |  | 267 |
Total |  |  | 2,991 | 3,384 |  | 6,206 |  | 7,604 |
Income (loss) before income tax |  |  | 1,012 | (1,074) |  | 1,419 |  | (2,195) |
Income tax (expense) benefit |  |  | (219) | 228 |  | (333) |  | 305 |
Net income (loss) |  |  | 793 | (846) |  | 1,086 |  | (1,890) |
Amounts attributable to noncontrolling interests |  |  | (39) | 11 |  | (71) |  | 423 |
Net income (loss) attributable to Loews Corporation |  |  | 754 | (835) |  | 1,015 |  | (1,467) |
Altium Packaging LLC [Member] |  |  |  |  |  |  |  |  |
Segments [Abstract] |  |  |  |  |  |  |  |  |
Percentage interest of subsidiary sold |  | 47.00% |  |  |  |  |  |  |
Operating Segments [Member] |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |
Insurance premiums |  |  | 2,035 | 1,850 |  | 3,997 |  | 3,719 |
Net investment income (loss) |  |  | 616 | 644 |  | 1,166 |  | 807 |
Investment gains (losses) |  |  | 578 | (1,142) |  | 635 |  | (1,358) |
Non-insurance warranty revenue |  |  | 359 | 308 |  | 697 |  | 609 |
Operating revenues and other |  |  | 415 | 650 |  | 1,130 |  | 1,632 |
Total |  |  | 4,003 | 2,310 |  | 7,625 |  | 5,409 |
Expenses [Abstract] |  |  |  |  |  |  |  |  |
Insurance claims and policyholders' benefits |  |  | 1,546 | 1,642 |  | 3,052 |  | 3,067 |
Amortization of deferred acquisition costs |  |  | 357 | 342 |  | 716 |  | 686 |
Non-insurance warranty expense |  |  | 332 | 285 |  | 643 |  | 566 |
Operating expenses and other |  |  | 656 | 992 |  | 1,570 |  | 3,018 |
Interest |  |  | 100 | 123 |  | 225 |  | 267 |
Total |  |  | 2,991 | 3,384 |  | 6,206 |  | 7,604 |
Income (loss) before income tax |  |  | 1,012 | (1,074) |  | 1,419 |  | (2,195) |
Income tax (expense) benefit |  |  | (219) | 228 |  | (333) |  | 305 |
Net income (loss) |  |  | 793 | (846) |  | 1,086 |  | (1,890) |
Amounts attributable to noncontrolling interests |  |  | (39) | 11 |  | (71) |  | 423 |
Net income (loss) attributable to Loews Corporation |  |  | 754 | (835) |  | 1,015 |  | (1,467) |
Operating Segments [Member] | CNA Financial [Member] |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |
Insurance premiums |  |  | 2,035 | 1,850 |  | 3,997 |  | 3,719 |
Net investment income (loss) |  |  | 591 | 534 |  | 1,095 |  | 863 |
Investment gains (losses) |  |  | 38 | 69 |  | 95 |  | (147) |
Non-insurance warranty revenue |  |  | 359 | 308 |  | 697 |  | 609 |
Operating revenues and other |  |  | 6 | 5 |  | 11 |  | 13 |
Total |  |  | 3,029 | 2,766 |  | 5,895 |  | 5,057 |
Expenses [Abstract] |  |  |  |  |  |  |  |  |
Insurance claims and policyholders' benefits |  |  | 1,546 | 1,642 |  | 3,052 |  | 3,067 |
Amortization of deferred acquisition costs |  |  | 357 | 342 |  | 716 |  | 686 |
Non-insurance warranty expense |  |  | 332 | 285 |  | 643 |  | 566 |
Operating expenses and other |  |  | 302 | 283 |  | 587 |  | 583 |
Interest |  |  | 29 | 31 |  | 57 |  | 62 |
Total |  |  | 2,566 | 2,583 |  | 5,055 |  | 4,964 |
Income (loss) before income tax |  |  | 463 | 183 |  | 840 |  | 93 |
Income tax (expense) benefit |  |  | (94) | (32) |  | (160) |  | (4) |
Net income (loss) |  |  | 369 | 151 |  | 680 |  | 89 |
Amounts attributable to noncontrolling interests |  |  | (39) | (16) |  | (71) |  | (9) |
Net income (loss) attributable to Loews Corporation |  |  | 330 | 135 |  | 609 |  | 80 |
Operating Segments [Member] | Boardwalk Pipelines [Member] |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |
Operating revenues and other |  |  | 312 | 296 |  | 684 |  | 637 |
Total |  |  | 312 | 296 |  | 684 |  | 637 |
Expenses [Abstract] |  |  |  |  |  |  |  |  |
Operating expenses and other |  |  | 209 | 210 |  | 426 |  | 421 |
Interest |  |  | 40 | 41 |  | 81 |  | 83 |
Total |  |  | 249 | 251 |  | 507 |  | 504 |
Income (loss) before income tax |  |  | 63 | 45 |  | 177 |  | 133 |
Income tax (expense) benefit |  |  | (16) | (11) |  | (45) |  | (34) |
Net income (loss) |  |  | 47 | 34 |  | 132 |  | 99 |
Net income (loss) attributable to Loews Corporation |  |  | 47 | 34 |  | 132 |  | 99 |
Operating Segments [Member] | Loews Hotels & Co [Member] |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |
Net investment income (loss) |  |  | 1 |  |  | 1 | [2] |  |
Operating revenues and other |  |  | 97 | 34 |  | 154 |  | 176 |
Total |  |  | 98 | 34 |  | 155 |  | 176 |
Expenses [Abstract] |  |  |  |  |  |  |  |  |
Operating expenses and other |  |  | 115 | 123 |  | 219 |  | 290 |
Interest |  |  | 9 | 8 |  | 17 |  | 16 |
Total |  |  | 124 | 131 |  | 236 |  | 306 |
Income (loss) before income tax |  |  | (26) | (97) |  | (81) |  | (130) |
Income tax (expense) benefit |  |  | 5 | 25 |  | 17 |  | 33 |
Net income (loss) |  |  | (21) | (72) |  | (64) |  | (97) |
Net income (loss) attributable to Loews Corporation |  |  | (21) | (72) |  | (64) |  | (97) |
Operating Segments [Member] | Corporate [Member] |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |
Net investment income (loss) |  |  | 24 | 110 | [3] | 70 | [2] | (56) | [3]
Investment gains (losses) |  |  | 540 | (1,211) | [3] | 540 | [2] | (1,211) | [3]
Operating revenues and other |  |  |  | 244 | [3] | 281 | [2] | 501 | [3]
Total |  |  | 564 | (857) | [3] | 891 | [2] | (766) | [3]
Expenses [Abstract] |  |  |  |  |  |  |  |  |
Operating expenses and other |  |  | 30 | 260 | [3] | 338 | [2] | 528 | [3]
Interest |  |  | 22 | 32 | [3] | 70 | [2] | 63 | [3]
Total |  |  | 52 | 292 | [3] | 408 | [2] | 591 | [3]
Income (loss) before income tax |  |  | 512 | (1,149) | [3] | 483 | [2] | (1,357) | [3]
Income tax (expense) benefit |  |  | (114) | 241 | [3] | (145) | [2] | 284 | [3]
Net income (loss) |  |  | 398 | (908) | [3] | 338 | [2] | (1,073) | [3]
Net income (loss) attributable to Loews Corporation |  |  | $ 398 | (908) | [3] | $ 338 | [2] | (1,073) | [3]
Operating Segments [Member] | Diamond Offshore [Member] |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |
Operating revenues and other | [4] |  |  | 71 |  |  |  | 305 |
Total | [4] |  |  | 71 |  |  |  | 305 |
Expenses [Abstract] |  |  |  |  |  |  |  |  |
Operating expenses and other | [4] |  |  | 116 |  |  |  | 1,196 |
Interest | [4] |  |  | 11 |  |  |  | 43 |
Total | [4] |  |  | 127 |  |  |  | 1,239 |
Income (loss) before income tax | [4] |  |  | (56) |  |  |  | (934) |
Income tax (expense) benefit | [4] |  |  | 5 |  |  |  | 26 |
Net income (loss) | [4] |  |  | (51) |  |  |  | (908) |
Amounts attributable to noncontrolling interests | [4] |  |  | 27 |  |  |  | 432 |
Net income (loss) attributable to Loews Corporation | [4] |  |  | $ (24) |  |  |  | $ (476) |
[1] | Gross investment gains on available-for-sale securities were $51 and $102 for the three months ended June 30, 2021 and 2020 and $109 and $131 for the six months ended June 30, 2021 and 2020. Gross investment losses on available-for-sale securities were $20 and $85 for the three months ended June 30, 2021 and 2020 and $40 and $189 for the six months ended June 30, 2021 and 2020. During the three and six months ended June 30, 2021, $15 of investment gains were recognized due to the change in fair value of non-redeemable preferred stock still held as of June 30, 2021. During the three and six months ended June 30, 2020, $63 of investment gains and $70 of investment losses were recognized due to the change in fair value of non-redeemable preferred stock still held as of June 30, 2020.
[2] | 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.
[3] | Amounts presented for Corporate include the operating results of Altium Packaging prior to the deconsolidation.
[4] | Amounts presented for Diamond Offshore reflect the periods prior to the deconsolidation.

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