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Medical Claims Liability - Cumulative incurred and Paid Claims (Details) - Health insurance product line - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Claims Development [Line Items]
Short-duration insurance contracts, incurred claims and allocated claim adjustment expense, net	$ 139,937
Short-duration insurance contracts, cumulative paid claims and allocated claim adjustment expense, net	133,133
Short-duration insurance contracts, liability for unpaid claims and allocated claim adjustment expense, net, not separately presented	6,804
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, cumulative paid claims and allocated claim adjustment expense, net	41,803	41,679	$ 37,876
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, cumulative paid claims and allocated claim adjustment expense, net	46,512	$ 41,972
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, cumulative paid claims and allocated claim adjustment expense, net	$ 44,818

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Amount, after reinsurance, of paid 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 (b)
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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

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-Publisher FASB
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-SubTopic 40
-Section 50
-Paragraph 4B
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Undiscounted amount, after reinsurance, of the liability for unpaid claims and allocated claim adjustment expense for short-duration insurance contracts for accident years not separately presented in claim development information. Excludes unallocated claim adjustment expense.

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