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Reserve for Unpaid Losses and Loss Adjustment Expenses - Historical Loss Development Triangles, Group (Details) - Group Benefits claim in Millions, $ in Millions | Dec. 31, 2021 USD ($) claim | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($)
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Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | $ 20,436 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 13,863 |  |  |  |  |  |  |  |  |
Group long-term disability |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 14,113 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 8,219 |  |  |  |  |  |  |  |  |
Group life and accident, excluding premium waiver |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 6,323 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 5,644 |  |  |  |  |  |  |  |  |
2012 | Group long-term disability |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,474 | $ 1,479 | $ 1,486 | $ 1,504 | $ 1,515 | $ 1,530 | $ 1,532 | $ 1,539 | $ 1,605 | $ 1,829
IBNR Reserves | $ 0 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 35,814 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 1,227 | 1,185 | 1,138 | 1,080 | 1,014 | 933 | 835 | 708 | 483 | $ 108
2013 | Group long-term disability |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,378 | 1,385 | 1,399 | 1,413 | 1,416 | 1,429 | 1,429 | 1,479 | 1,660 |
IBNR Reserves | $ 0 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 30,757 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 1,113 | 1,067 | 1,016 | 954 | 881 | 791 | 664 | 443 | $ 102 |
2014 | Group long-term disability |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,389 | 1,395 | 1,408 | 1,431 | 1,431 | 1,430 | 1,473 | 1,636 |  |
IBNR Reserves | $ 0 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 31,927 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 1,079 | 1,025 | 960 | 884 | 801 | 675 | 448 | $ 103 |  |
2015 | Group long-term disability |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,380 | 1,385 | 1,401 | 1,420 | 1,422 | 1,442 | 1,595 |  |  |
IBNR Reserves | $ 0 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 32,727 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 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 | 1,409 | 1,417 | 1,437 | 1,468 | 1,481 | 1,651 |  |  |  |
IBNR Reserves | $ 0 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 33,301 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 981 | 907 | 819 | 705 | 479 | $ 112 |  |  |  |
2017 | Group long-term disability |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,304 | 1,316 | 1,358 | 1,413 | 1,597 |  |  |  |  |
IBNR Reserves | $ 1 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 30,902 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 842 | 757 | 658 | 452 | $ 109 |  |  |  |  |
2018 | Group long-term disability |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,277 | 1,309 | 1,387 | 1,647 |  |  |  |  |  |
IBNR Reserves | $ 1 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 28,403 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 743 | 639 | 447 | $ 105 |  |  |  |  |  |
2019 | Group long-term disability |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,327 | 1,424 | 1,650 |  |  |  |  |  |  |
IBNR Reserves | $ 5 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 27,375 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 650 | 454 | 101 |  |  |  |  |  |  |
2019 | Group life and accident, excluding premium waiver |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,867 | 1,866 | 1,902 |  |  |  |  |  |  |
IBNR Reserves | $ 9 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 57,811 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 1,847 | 1,830 | $ 1,471 |  |  |  |  |  |  |
2020 | Group long-term disability |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,407 | 1,686 |  |  |  |  |  |  |  |
IBNR Reserves | $ 29 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 25,503 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 458 | 100 |  |  |  |  |  |  |  |
2020 | Group life and accident, excluding premium waiver |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 2,072 | 2,072 |  |  |  |  |  |  |  |
IBNR Reserves | $ 21 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 60,509 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 2,033 | $ 1,524 |  |  |  |  |  |  |  |
2021 | Group long-term disability |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,768 |  |  |  |  |  |  |  |  |
IBNR Reserves | $ 881 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 17,132 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 101 |  |  |  |  |  |  |  |  |
2021 | Group life and accident, excluding premium waiver |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 2,384 |  |  |  |  |  |  |  |  |
IBNR Reserves | $ 467 |  |  |  |  |  |  |  |  |
Claims Reported | claim | 51,507 |  |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 1,764 |  |  |  |  |  |  |  |  |

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