Medical claims payable for the Health Care segment reflects estimates of the ultimate cost of claims that have been incurred but not yet reported, those that have been reported but not yet paid (reported claims in process) and other medical expense payable, that primarily comprises accruals for incentives and other amounts payable to health care professionals and facilities. Incurred but not yet reported comprises the majority of the reserve balance as follows:

	June 30,		December 31,
(In millions)	2011		2010
Incurred but not yet reported	$	1,026	$	1,067
Reported claims in process		182		164
Other medical expense payable		17		15
Medical claims payable	$	1,225	$	1,246

	For the period ended
	June 30,		December 31,
(In millions)	2011		2010
Balance at January 1,	$	1,246	$	921
Less: Reinsurance and other amounts recoverable		236		206
Balance at January 1, net		1,010		715
Incurred claims related to:
Current year		4,232		8,663
Prior years		(121)		(93)
Total incurred		4,111		8,570
Paid claims related to:
Current year		3,310		7,682
Prior years		809		593
Total paid		4,119		8,275
Ending Balance, net		1,002		1,010
Add: Reinsurance and other amounts recoverable		223		236
Ending Balance	$	1,225	$	1,246

Reinsurance and other amounts recoverable reflect amounts due from reinsurers and policyholders to cover incurred but not reported and pending claims for minimum premium products and certain administrative services only business where the right of offset does not exist. See Note 10 for additional information on reinsurance. For the six months ended June 30, 2011, actual experience differed from the Company's key assumptions resulting in favorable incurred claims related to prior years' medical claims payable of $121 million, or 1.4% of the current year incurred claims as reported for the year ended December 31, 2010. Actual completion factors resulted in a reduction in medical claims payable of $80 million, or 0.9% of the current year incurred claims as reported for the year ended December 31, 2010 for the insured book of business. Actual medical cost trend resulted in a reduction in medical claims payable of $41 million, or 0.5% of the current year incurred claims as reported for the year ended December 31, 2010 for the insured book of business.

For the year ended December 31, 2010, actual experience differed from the Company's key assumptions, resulting in favorable incurred claims related to prior years' medical claims payable of $93 million, or 1.3% of the current year incurred claims as reported for the year ended December 31, 2009. Actual completion factors resulted in a reduction of the medical claims payable of $51 million, or 0.7% of the current year incurred claims as reported for the year ended December 31, 2009 for the insured book of business. Actual medical cost trend resulted in a reduction of the medical claims payable of $42 million, or 0.6% of the current year incurred claims as reported for the year ended December 31, 2009 for the insured book of business..

The favorable impacts in 2011 and 2010 relating to completion factors and medical cost trend variances include the release of the provision for moderately adverse conditions, that is a component of the assumptions for both completion factors and medical cost trend, established for claims incurred related to prior years. This release was substantially offset by the provision for moderately adverse conditions established for claims incurred related to the current year.

The corresponding impact of prior year development on shareholders' net income was $47 million for the six months ended June 30, 2011 compared with $17 million for the six months ended June 30, 2010. The favorable effects of prior year development on net income in 2011 and 2010 primarily reflect low medical services utilization trend. The change in the amount of the incurred claims related to prior years in the medical claims payable liability does not directly correspond to an increase or decrease in the Company's shareholders' net income recognized for the following reasons:

First, the Company consistently recognizes the actuarial best estimate of the ultimate liability within a level of confidence, as required by actuarial standards of practice, that require the liabilities to be adequate under moderately adverse conditions. As the Company establishes the liability for each incurral year, the Company ensures that its assumptions appropriately consider moderately adverse conditions. When a portion of the development related to the prior year incurred claims is offset by an increase determined appropriate to address moderately adverse conditions for the current year incurred claims, the Company does not consider that offset amount as having any impact on shareholders' net income.

Second, changes in reserves for the Company's retrospectively experience-rated business do not always impact shareholders' net income. For the Company's retrospectively experience-rated business, only adjustments to medical claims payable on accounts in deficit affect shareholders' net income. An increase or decrease to medical claims payable on accounts in deficit, in effect, accrues to the Company and directly impacts shareholders' net income. An account is in deficit when the accumulated medical costs and administrative charges, including profit charges, exceed the accumulated premium received. Adjustments to medical claims payable on accounts in surplus accrue directly to the policyholder with no impact on the Company's shareholders' net income. An account is in surplus when the accumulated premium received exceeds the accumulated medical costs and administrative charges, including profit charges.

The determination of liabilities for Health Care medical claims payable requires the Company to make critical accounting estimates. See Note 2(N) to the Consolidated Financial Statements in the Company's 2010 Form 10-K.