Affordable Care Act (Details) - USD ($) $ in Millions |
3 Months Ended | |||
|---|---|---|---|---|
Jun. 30, 2017 |
Jun. 30, 2016 |
Sep. 30, 2017 |
Dec. 31, 2016 |
|
| Affordable Care Act [Abstract] | ||||
| Risk adjustment and reinsurance, pre-tax benefit, period increase (decrease) | $ 48 | $ 70 | ||
| Risk adjustment | $ (609) | $ (425) | ||
| Reinsurance | 15 | 122 | ||
| Risk corridor | (8) | (3) | ||
| Minimum MLR | (1) | (18) | ||
| Cost sharing reductions | $ (180) | $ (147) | ||
| X | ||||||||||
- Definition Affordable Care Act [Abstract] No definition available.
|
| X | ||||||||||
- Definition Affordable Care Act Cost Sharing Reductions No definition available.
|
| X | ||||||||||
- Definition Affordable Care Act Minimum Medical Loss Ratio No definition available.
|
| X | ||||||||||
- Definition Affordable Care Act Reinsurance No definition available.
|
| X | ||||||||||
- Definition Affordable Care Act Risk Adjustment No definition available.
|
| X | ||||||||||
- Definition Affordable Care Act Risk Adjustment and Reinsurance, Pre-Tax Benefit, Period Increase (Decrease) No definition available.
|
| X | ||||||||||
- Definition Affordable Care Act Risk Corridor No definition available.
|