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Medical Claims Liability (Tables) | 12 Months Ended
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Dec. 31, 2018
Insurance [Abstract] |
Schedule Of Change In Medical Claims Liability by Operating Segment | The following table summarizes the change in medical claims liability ($ in millions):
|  | Year Ended December 31,
|  | 2018 |  | 2017 |  | 2016
Balance, January 1 |  | $ | 4,286 |  |  | $ | 3,929 |  |  | $ | 2,298 |
Less: reinsurance recoverable |  | 18 |  |  | 5 |  |  | — |
Balance, January 1, net |  | 4,268 |  |  | 3,924 |  |  | 2,298 |
Acquisitions |  | 1,204 |  |  | — |  |  | 1,482 |
Less: acquired reinsurance recoverable |  | 8 |  |  | — |  |  | — |
Incurred related to: |  |  |  |  |  |
Current year |  | 46,484 |  |  | 38,225 |  |  | 30,946 |
Prior years |  | (427 | ) |  | (374 | ) |  | (310 | )
Total incurred |  | 46,057 |  |  | 37,851 |  |  | 30,636 |
Paid related to: |  |  |  |  |  |
Current year |  | 41,161 |  |  | 34,196 |  |  | 28,532 |
Prior years |  | 3,556 |  |  | 3,311 |  |  | 1,960 |
Total paid |  | 44,717 |  |  | 37,507 |  |  | 30,492 |
Balance at December 31, net |  | 6,804 |  |  | 4,268 |  |  | 3,924 |
Plus: reinsurance recoverable |  | 27 |  |  | 18 |  |  | 5 |
Balance, December 31 |  | $ | 6,831 |  |  | $ | 4,286 |  |  | $ | 3,929 |
Short-duration Insurance Contracts, Claims Development | Incurred and paid claims development as of December 31, 2018 is as follows ($ in millions):
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance
For the Years Ended December 31,
Claim Year |  | 2016 (unaudited) |  | 2017 (unaudited) |  | 2018
2016 |  | $ | 42,512 |  |  | $ | 41,947 |  |  | $ | 41,890 |
2017 |  |  |  | 47,310 |  |  | 46,738 |
2018 |  |  |  |  |  | 51,309 |
|  | Total incurred claims |  |  | $ | 139,937 |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance
For the Years Ended December 31,
Claim Year |  | 2016 (unaudited) |  | 2017 (unaudited) |  | 2018
2016 |  | $ | 37,876 |  |  | $ | 41,679 |  |  | $ | 41,803 |
2017 |  |  |  | 41,972 |  |  | 46,512 |
2018 |  |  |  |  |  | 44,818 |
|  | Total payment of incurred claims |  |  | $ | 133,133 |
|  | Medical claims liability, net of reinsurance |  |  | $ | 6,804 |
Information is summarized as follows (in millions):
| December 31, 2018
| Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance |  | Total IBNR Plus Expected Development on Reported Claims |  | Cumulative Paid Claims
2016 | $ | 41,890 |  |  | $ | 3 |  |  | 228.8 |
2017 | 46,738 |  |  | 60 |  |  | 256.7 |
2018 | 51,309 |  |  | 5,092 |  |  | 266.8 |

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- Definition Tabular disclosure of the activity in the reserve for settling insured claims and expenses incurred in the claims settlement process for the period. The estimated liability includes the amount of money that will be required for future payments of (a) claims that have been reported to the insurer, (b) claims related to insured events that have occurred but that have not been reported to the insurer as of the date the liability is estimated, and (c) claim adjustment expenses. Claim adjustment expenses include costs incurred in the claim settlement process such as legal fees; outside adjuster fees; and costs to record, process, and adjust claims. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=99382578&loc=d3e14764-158437 + Details
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- Definition Tabular disclosure of undiscounted information about claims development by accident year for short-duration insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=99384497&loc=SL65671311-158438 + Details
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