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Reserve for Unpaid Losses and Loss Adjustment Expenses - Historical Loss Development Triangles, Group (Details) - Group Benefits $ in Millions | Dec. 31, 2024 USD ($) claim | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
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Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | $ 20,578 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 13,912 |  |  |  |  |  |  |  |  |
Group long-term disability |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 14,365 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 8,243 |  |  |  |  |  |  |  |  |
Group life and accident, excluding premium waiver |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 6,213 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 5,669 |  |  |  |  |  |  |  |  |
2015 | Group long-term disability |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,385 | $ 1,380 | $ 1,380 | $ 1,380 | $ 1,385 | $ 1,401 | $ 1,420 | $ 1,422 | $ 1,442 | $ 1,595
IBNR Reserves | $ 0 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 32,589 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 1,164 | 1,125 | 1,078 | 1,025 | 962 | 891 | 806 | 687 | 460 | $ 108
2016 | Group long-term disability |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,407 | 1,400 | 1,401 | 1,409 | 1,417 | 1,437 | 1,468 | 1,481 | 1,651 |
IBNR Reserves | $ 0 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 33,307 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 1,144 | 1,100 | 1,043 | 981 | 907 | 819 | 705 | 479 | $ 112 |
2017 | Group long-term disability |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,294 | 1,289 | 1,296 | 1,304 | 1,316 | 1,358 | 1,413 | 1,597 |  |
IBNR Reserves | $ 0 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 30,929 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 1,017 | 970 | 911 | 842 | 757 | 658 | 452 | $ 109 |  |
2018 | Group long-term disability |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,279 | 1,271 | 1,276 | 1,277 | 1,309 | 1,387 | 1,647 |  |  |
IBNR Reserves | $ 0 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 28,428 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 954 | 897 | 827 | 743 | 639 | 447 | $ 105 |  |  |
2019 | Group long-term disability |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,277 | 1,287 | 1,284 | 1,327 | 1,424 | 1,650 |  |  |  |
IBNR Reserves | $ 0 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 27,467 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 895 | 832 | 751 | 650 | 454 | $ 101 |  |  |  |
2020 | Group long-term disability |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,260 | 1,282 | 1,323 | 1,407 | 1,686 |  |  |  |  |
IBNR Reserves | $ 0 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 25,862 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 839 | 767 | 663 | 458 | $ 100 |  |  |  |  |
Short-Duration Insurance Contract, Accident Year 2021 [Member] | Group long-term disability |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,351 | 1,417 | 1,521 | 1,768 |  |  |  |  |  |
IBNR Reserves | $ 1 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 27,156 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 820 | 720 | 493 | $ 101 |  |  |  |  |  |
Short-Duration Insurance Contract, Accident Year 2022 | Group long-term disability |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,452 | 1,566 | 1,842 |  |  |  |  |  |  |
IBNR Reserves | $ 6 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 25,952 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 719 | 496 | 101 |  |  |  |  |  |  |
Short-Duration Insurance Contract, Accident Year 2022 | Group life and accident, excluding premium waiver |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 2,056 | 2,053 | 2,061 |  |  |  |  |  |  |
IBNR Reserves | $ 12 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 72,225 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 2,040 | 2,018 | $ 1,562 |  |  |  |  |  |  |
Short-Duration Insurance Contract, Accident Year 2023 | Group long-term disability |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,700 | 1,988 |  |  |  |  |  |  |  |
IBNR Reserves | $ 44 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 28,026 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 562 | 116 |  |  |  |  |  |  |  |
Short-Duration Insurance Contract, Accident Year 2023 | Group life and accident, excluding premium waiver |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 2,092 | 2,108 |  |  |  |  |  |  |  |
IBNR Reserves | $ 25 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 74,958 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 2,053 | $ 1,572 |  |  |  |  |  |  |  |
Short-Duration Insurance Contract, Accident Year 2024 | Group long-term disability |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,960 |  |  |  |  |  |  |  |  |
IBNR Reserves | $ 970 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 18,035 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 129 |  |  |  |  |  |  |  |  |
Short-Duration Insurance Contract, Accident Year 2024 | Group life and accident, excluding premium waiver |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 2,065 |  |  |  |  |  |  |  |  |
IBNR Reserves | $ 380 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 59,084 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 1,576 |  |  |  |  |  |  |  |  |

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