BENEFITS PAYABLE - Narrative (Details)
claim in Millions, $ in Millions |
12 Months Ended |
|
Dec. 31, 2019
USD ($)
claim
|
Dec. 31, 2018
USD ($)
claim
|
Dec. 31, 2017
USD ($)
claim
|
| Claims Development [Line Items] |
|
|
|
| Favorable medical claims reserve development related to prior fiscal years | $ |
$ 336
|
$ 503
|
$ 483
|
| Benefit expense reduction excluded from previous short duration benefits payable rollforward | $ |
|
|
$ (22)
|
| Retail |
|
|
|
| Claims Development [Line Items] |
|
|
|
| Total IBNR | $ |
3,600
|
|
|
| Group and Specialty |
|
|
|
| Claims Development [Line Items] |
|
|
|
| Total IBNR | $ |
$ 567
|
|
|
| 2019 Claims Incurred Year | Retail |
|
|
|
| Claims Development [Line Items] |
|
|
|
| Cumulative number of reported claims |
123.0
|
|
|
| 2019 Claims Incurred Year | Group and Specialty |
|
|
|
| Claims Development [Line Items] |
|
|
|
| Cumulative number of reported claims |
9.7
|
|
|
| 2018 Claims Incurred Year | Retail |
|
|
|
| Claims Development [Line Items] |
|
|
|
| Cumulative number of reported claims |
|
109.6
|
|
| 2018 Claims Incurred Year | Group and Specialty |
|
|
|
| Claims Development [Line Items] |
|
|
|
| Cumulative number of reported claims |
|
10.8
|
|
| 2017 Claims Incurred Year | Retail |
|
|
|
| Claims Development [Line Items] |
|
|
|
| Cumulative number of reported claims |
|
|
104.7
|
| 2017 Claims Incurred Year | Group and Specialty |
|
|
|
| Claims Development [Line Items] |
|
|
|
| Cumulative number of reported claims |
|
|
11.1
|