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Medical Claims and Benefits Payable - Reconciliation of Claims Development (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Insurance [Abstract]
Incurred claims and allocated claims adjustment expenses	$ 54,039
Less: cumulative paid claims and allocated claims adjustment expenses	(51,180)
All outstanding liabilities before 2019	6
Acquired balances, net of post-acquisition adjustments	224
Non-risk and other provider payables	274
Medical claims and benefits payable	$ 3,363	$ 2,696	$ 1,854	$ 1,961

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- Definition

Short-duration Insurance Contracts, Liability for Unpaid Claims and Claim Adjustment Expense, Outstanding Liabilities Relating to Prior Years

+ References

No definition available.

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- Definition

The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 50
-Paragraph 3
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- Definition

Amount of increase (decrease) in the cost of settling unpaid claims after deduction of reinsurance recoveries related to the acquisition of a business. Includes, but is not limited to, claims which have been incurred but not reported.

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- Definition

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.

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- Definition

Undiscounted amount, after reinsurance, of the liability for unpaid claims and allocated claim adjustment expense for short-duration insurance contracts. Excludes unallocated claim adjustment expense.

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Amount of aggregate reconciling items for the reconciliation of the liability in the disclosure of claims development (in excess of) less than the liability for unpaid claims and claims adjustment expense for short-duration insurance contracts.

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