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Reserve for Unpaid Losses and Loss Adjustment Expenses - Historical Loss Development Triangles, Group (Details) - Group Insurance Policies claim in Millions, $ in Millions | Dec. 31, 2017 USD ($) claim | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($)
--- | --- | --- | --- | --- | --- | --- | ---
Claims Development [Line Items] |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | $ 16,350 |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 10,488 |  |  |  |  |  |
Group long-term disability |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 10,511 |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 5,138 |  |  |  |  |  |
Group life and accident, excluding premium waiver |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 5,839 |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 5,350 |  |  |  |  |  |
2011 | Group long-term disability |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,649 | $ 1,660 | $ 1,669 | $ 1,659 | $ 1,660 | $ 1,761 | $ 1,917
IBNR Reserves | $ 1 |  |  |  |  |  |
Claims Reported | claim | 39,149 |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 1,167 | 1,087 | 996 | 886 | 743 | 508 | $ 118
2012 | Group long-term disability |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,515 | 1,530 | 1,532 | 1,539 | 1,605 | 1,829 |
IBNR Reserves | $ 0 |  |  |  |  |  |
Claims Reported | claim | 37,438 |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 1,014 | 933 | 835 | 708 | 483 | $ 108 |
2013 | Group long-term disability |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,416 | 1,429 | 1,429 | 1,479 | 1,660 |  |
IBNR Reserves | $ 2 |  |  |  |  |  |
Claims Reported | claim | 31,752 |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 881 | 791 | 664 | 443 | $ 102 |  |
2014 | Group long-term disability |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,431 | 1,430 | 1,473 | 1,636 |  |  |
IBNR Reserves | $ 2 |  |  |  |  |  |
Claims Reported | claim | 32,936 |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 801 | 675 | 448 | $ 103 |  |  |
2015 | Group long-term disability |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,422 | 1,442 | 1,595 |  |  |  |
IBNR Reserves | $ 15 |  |  |  |  |  |
Claims Reported | claim | 33,349 |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 687 | 460 | 108 |  |  |  |
2015 | Group life and accident, excluding premium waiver |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,921 | 1,919 | 1,983 |  |  |  |
IBNR Reserves | $ 8 |  |  |  |  |  |
Claims Reported | claim | 47,954 |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 1,911 | 1,889 | $ 1,541 |  |  |  |
2016 | Group long-term disability |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,481 | 1,651 |  |  |  |  |
IBNR Reserves | $ 38 |  |  |  |  |  |
Claims Reported | claim | 33,413 |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 479 | 112 |  |  |  |  |
2016 | Group life and accident, excluding premium waiver |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,919 | 1,974 |  |  |  |  |
IBNR Reserves | $ 23 |  |  |  |  |  |
Claims Reported | claim | 44,762 |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 1,888 | $ 1,529 |  |  |  |  |
2017 | Group long-term disability |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,597 |  |  |  |  |  |
IBNR Reserves | $ 687 |  |  |  |  |  |
Claims Reported | claim | 23,158 |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 109 |  |  |  |  |  |
2017 | Group life and accident, excluding premium waiver |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,999 |  |  |  |  |  |
IBNR Reserves | $ 401 |  |  |  |  |  |
Claims Reported | claim | 35,592 |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 1,551 |  |  |  |  |  |

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