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Medical Claims Liability - Incurred Claims and Allocated Claims Adjustment Expenses (Details) - Health insurance product line claim in Millions, $ in Millions	Dec. 31, 2018 USD ($) claim	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Claims Development [Line Items]
Short-duration insurance contracts, incurred claims and allocated claim adjustment expense, net	$ 139,937
Short-duration insurance contracts, accident year 2016
Claims Development [Line Items]
Short-duration insurance contracts, incurred claims and allocated claim adjustment expense, net	41,890	$ 41,947	$ 42,512
Short-duration insurance contracts, expected development on reported claims	$ 3
Short-duration Insurance contracts, number of reported claims | claim	228.8
Short-duration insurance contracts, accident year 2017
Claims Development [Line Items]
Short-duration insurance contracts, incurred claims and allocated claim adjustment expense, net	$ 46,738	$ 47,310
Short-duration insurance contracts, expected development on reported claims	$ 60
Short-duration Insurance contracts, number of reported claims | claim	256.7
Short-duration insurance contracts, accident year 2018
Claims Development [Line Items]
Short-duration insurance contracts, incurred claims and allocated claim adjustment expense, net	$ 51,309
Short-duration insurance contracts, expected development on reported claims	$ 5,092
Short-duration Insurance contracts, number of reported claims | claim	266.8

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- Definition

Short-duration Insurance Contracts, Incurred but Not Reported Liabilities and Expected Development on Reported Claims

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- Definition

Undiscounted amount, after reinsurance, of incurred claims and allocated claim adjustment expense used in claims development for short-duration insurance contracts. Excludes unallocated claim adjustment expense.

+ 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
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99384497&loc=SL65671311-158438

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- Definition

Cumulative number of reported claims for short-duration insurance contracts.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 50
-Paragraph 4D
-Subparagraph (b)
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