INCOME TAXES - Provision for Income Taxes Reconciliation (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
|
| Income Tax Disclosure [Abstract] | |||
| Income tax provision at federal statutory rate | $ 729 | $ 436 | $ 1,407 |
| States, net of federal benefit, and Puerto Rico | 49 | 42 | 80 |
| Tax exempt investment income | (6) | (11) | (22) |
| Health insurance industry fee | 0 | 243 | 0 |
| Nondeductible executive compensation | 25 | 17 | 36 |
| Tax reform | 0 | (39) | 133 |
| KMG sale | 0 | (272) | 0 |
| Other, net | (34) | (25) | (62) |
| Provision for income taxes | $ 763 | $ 391 | $ 1,572 |