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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, 2018 USD ($) claim | Dec. 31, 2017 USD ($) | 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 Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 11,584 |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 17,754 |  |  |  |  |  |  |
Group long-term disability |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 6,217 |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 11,934 |  |  |  |  |  |  |
Group life and accident, excluding premium waiver |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 5,367 |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 5,820 |  |  |  |  |  |  |
2011 | Group long-term disability |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | 1,231 | $ 1,167 | $ 1,087 | $ 996 | $ 886 | $ 743 | $ 508 | $ 118
Cumulative Incurred for Accident Years Displayed in Triangles | 1,638 | 1,649 | 1,660 | 1,669 | 1,659 | 1,660 | 1,761 | $ 1,917
IBNR Reserves | $ 1 |  |  |  |  |  |  |
Claims Reported | claim | 39,097 |  |  |  |  |  |  |
2012 | Group long-term disability |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 1,080 | 1,014 | 933 | 835 | 708 | 483 | 108 |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,504 | 1,515 | 1,530 | 1,532 | 1,539 | 1,605 | $ 1,829 |
IBNR Reserves | $ 1 |  |  |  |  |  |  |
Claims Reported | claim | 37,343 |  |  |  |  |  |  |
2013 | Group long-term disability |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 954 | 881 | 791 | 664 | 443 | 102 |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,413 | 1,416 | 1,429 | 1,429 | 1,479 | $ 1,660 |  |
IBNR Reserves | $ 1 |  |  |  |  |  |  |
Claims Reported | claim | 31,755 |  |  |  |  |  |  |
2014 | Group long-term disability |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 884 | 801 | 675 | 448 | 103 |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,431 | 1,431 | 1,430 | 1,473 | $ 1,636 |  |  |
IBNR Reserves | $ 3 |  |  |  |  |  |  |
Claims Reported | claim | 32,970 |  |  |  |  |  |  |
2015 | Group long-term disability |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 806 | 687 | 460 | 108 |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,420 | 1,422 | 1,442 | $ 1,595 |  |  |  |
IBNR Reserves | $ 5 |  |  |  |  |  |  |
Claims Reported | claim | 33,541 |  |  |  |  |  |  |
2015 | Group life and accident, excluding premium waiver |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 1,906 | 1,888 | 1,529 |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,915 | 1,919 | 1,974 |  |  |  |  |
IBNR Reserves | $ 5 |  |  |  |  |  |  |
Claims Reported | claim | 45,206 |  |  |  |  |  |  |
2016 | Group long-term disability |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 705 | 479 | 112 |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,468 | 1,481 | $ 1,651 |  |  |  |  |
IBNR Reserves | $ 12 |  |  |  |  |  |  |
Claims Reported | claim | 34,259 |  |  |  |  |  |  |
2016 | Group life and accident, excluding premium waiver |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 1,929 | 1,551 |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,953 | 1,999 |  |  |  |  |  |
IBNR Reserves | $ 20 |  |  |  |  |  |  |
Claims Reported | claim | 44,539 |  |  |  |  |  |  |
2017 | Group long-term disability |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 452 | 109 |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,413 | $ 1,597 |  |  |  |  |  |
IBNR Reserves | $ 36 |  |  |  |  |  |  |
Claims Reported | claim | 31,135 |  |  |  |  |  |  |
2017 | Group life and accident, excluding premium waiver |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 1,532 |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,952 |  |  |  |  |  |  |
IBNR Reserves | $ 376 |  |  |  |  |  |  |
Claims Reported | claim | 41,876 |  |  |  |  |  |  |
2018 | Group long-term disability |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance | $ 105 |  |  |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,647 |  |  |  |  |  |  |
IBNR Reserves | $ 810 |  |  |  |  |  |  |
Claims Reported | claim | 19,386 |  |  |  |  |  |  |

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