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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, 2019 USD ($) claim | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($)
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Claims Development [Line Items] |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | $ 18,950 |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 12,648 |  |  |  |  |  |  |  |
Group long-term disability |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 13,157 |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 7,316 |  |  |  |  |  |  |  |
Group long-term disability | 2011 |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,631 | $ 1,638 | $ 1,649 | $ 1,660 | $ 1,669 | $ 1,659 | $ 1,660 | $ 1,761 | $ 1,917
IBNR Reserves | $ 0 |  |  |  |  |  |  |  |
Claims Reported | claim | 39,246 |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 1,286 | 1,231 | 1,167 | 1,087 | 996 | 886 | 743 | 508 | $ 118
Group long-term disability | 2012 |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,486 | 1,504 | 1,515 | 1,530 | 1,532 | 1,539 | 1,605 | 1,829 |
IBNR Reserves | $ 0 |  |  |  |  |  |  |  |
Claims Reported | claim | 37,523 |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 1,138 | 1,080 | 1,014 | 933 | 835 | 708 | 483 | $ 108 |
Group long-term disability | 2013 |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,399 | 1,413 | 1,416 | 1,429 | 1,429 | 1,479 | 1,660 |  |
IBNR Reserves | $ 1 |  |  |  |  |  |  |  |
Claims Reported | claim | 31,946 |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 1,016 | 954 | 881 | 791 | 664 | 443 | $ 102 |  |
Group long-term disability | 2014 |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,408 | 1,431 | 1,431 | 1,430 | 1,473 | 1,636 |  |  |
IBNR Reserves | $ 2 |  |  |  |  |  |  |  |
Claims Reported | claim | 33,213 |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 960 | 884 | 801 | 675 | 448 | $ 103 |  |  |
Group long-term disability | 2015 |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,401 | 1,420 | 1,422 | 1,442 | 1,595 |  |  |  |
IBNR Reserves | $ 3 |  |  |  |  |  |  |  |
Claims Reported | claim | 33,820 |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 891 | 806 | 687 | 460 | $ 108 |  |  |  |
Group long-term disability | 2016 |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,437 | 1,468 | 1,481 | 1,651 |  |  |  |  |
IBNR Reserves | $ 3 |  |  |  |  |  |  |  |
Claims Reported | claim | 34,719 |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 819 | 705 | 479 | $ 112 |  |  |  |  |
Group long-term disability | 2017 |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,358 | 1,413 | 1,597 |  |  |  |  |  |
IBNR Reserves | $ 8 |  |  |  |  |  |  |  |
Claims Reported | claim | 31,865 |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 658 | 452 | 109 |  |  |  |  |  |
Group long-term disability | 2018 |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,387 | 1,647 |  |  |  |  |  |  |
IBNR Reserves | $ 37 |  |  |  |  |  |  |  |
Claims Reported | claim | 28,551 |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 447 | 105 |  |  |  |  |  |  |
Group long-term disability | 2019 |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,650 |  |  |  |  |  |  |  |
IBNR Reserves | $ 852 |  |  |  |  |  |  |  |
Claims Reported | claim | 17,753 |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 101 |  |  |  |  |  |  |  |
Group life and accident, excluding premium waiver |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 5,793 |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 5,332 |  |  |  |  |  |  |  |
Group life and accident, excluding premium waiver | 2017 |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,951 | 1,953 | 1,999 |  |  |  |  |  |
IBNR Reserves | $ 4 |  |  |  |  |  |  |  |
Claims Reported | claim | 45,139 |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 1,945 | 1,929 | $ 1,551 |  |  |  |  |  |
Group life and accident, excluding premium waiver | 2018 |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,940 | 1,952 |  |  |  |  |  |  |
IBNR Reserves | $ 18 |  |  |  |  |  |  |  |
Claims Reported | claim | 52,027 |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 1,916 | $ 1,532 |  |  |  |  |  |  |
Group life and accident, excluding premium waiver | 2019 |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,902 |  |  |  |  |  |  |  |
IBNR Reserves | $ 373 |  |  |  |  |  |  |  |
Claims Reported | claim | 45,825 |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 1,471 |  |  |  |  |  |  |  |

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