Medical Claims Liability - Narrative (Details) - USD ($) $ in Millions |
9 Months Ended | |
|---|---|---|
Sep. 30, 2018 |
Sep. 30, 2017 |
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| Insurance [Abstract] | ||
| Amounts recorded as an adjustment to premium revenues related to minimum HBR and return of premium programs | $ 23 | $ (4) |
| Short-duration insurance contracts, Incurred but not reported and expected development on reported claims | $ 5,326 | |
| X | ||||||||||
- Definition Amounts recorded as an adjustment to premium revenues related to minimum HBR and return of premium programs No definition available.
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Undiscounted amount, after reinsurance, of incurred-but-not-reported (IBNR) liabilities plus expected development on reported claims, for claims and allocated claim adjustment expense for short-duration insurance contracts. Excludes unallocated claim adjustment expense. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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