9. Reserve for Property-Liability Insurance Claims and Claims Expense

The Company establishes reserves for claims and claims expense on reported and unreported claims of insured losses. The Company's reserving process takes into account known facts and interpretations of circumstances and factors including the Company's experience with similar cases, actual claims paid, historical trends involving claim payment patterns and pending levels of unpaid claims, loss management programs, product mix and contractual terms, changes in law and regulation, judicial decisions, and economic conditions. In the normal course of business, the Company may also supplement its claims processes by utilizing third party adjusters, appraisers, engineers, inspectors, and other professionals and information sources to assess and settle catastrophe and non-catastrophe related claims. The effects of inflation are implicitly considered in the reserving process.

Because reserves are estimates of unpaid portions of losses that have occurred, including incurred but not reported ("IBNR") losses, the establishment of appropriate reserves, including reserves for catastrophes, is an inherently uncertain and complex process. The ultimate cost of losses may vary materially from recorded amounts, which are based on management's best estimates. The highest degree of uncertainty is associated with reserves for losses incurred in the current reporting period as it contains the greatest proportion of losses that have not been reported or settled. The Company regularly updates its reserve estimates as new information becomes available and as events unfold that may affect the resolution of unsettled claims. Changes in prior year reserve estimates, which may be material, are reported in property-liability insurance claims and claims expense in the Consolidated Statements of Operations in the period such changes are determined.

Activity in the reserve for property-liability insurance claims and claims expense is summarized as follows:

($ in millions)	2013			2012			2011

Balance as of January 1	$	21,288		$	20,375		$	19,468
Less reinsurance recoverables		4,010			2,588			2,072


Net balance as of January 1		17,278			17,787			17,396


Esurance acquisition as of October 7, 2011		—			(13	) ⁽¹⁾		425
Incurred claims and claims expense related to:
Current year		18,032			19,149			20,496
Prior years		(121	)		(665	)		(335	)


Total incurred		17,911			18,484			20,161


Claims and claims expense paid related to:
Current year		11,658			12,545			13,893
Prior years		6,338			6,435			6,302


Total paid		17,996			18,980			20,195


Net balance as of December 31		17,193			17,278			17,787
Plus reinsurance recoverables		4,664			4,010			2,588


Balance as of December 31	$	21,857		$	21,288		$	20,375

(1): The Esurance opening balance sheet reserves wer e reestimated in 2012 resulting in a reduction in reserves due to lower severity. The adjustment was recorded as a reduction in goodwill and an increase in payables to the seller under the terms of the purchase agreement and therefore had no impact on claims expense.

Incurred claims and claims expense represents the sum of paid losses and reserve changes in the calendar year. This expense includes losses from catastrophes of $1.25 billion, $2.35 billion and $3.82 billion in 2013, 2012 and 2011, respectively, net of reinsurance and other recoveries (see Note 11). Catastrophes are an inherent risk of the property-liability insurance business that have contributed to, and will continue to contribute to, material year-to-year fluctuations in the Company's results of operations and financial position.

The Company calculates and records a single best reserve estimate for losses from catastrophes, in conformance with generally accepted actuarial standards. As a result, management believes that no other estimate is better than the recorded amount. Due to the uncertainties involved, including the factors described above, the ultimate cost of losses may vary materially from recorded amounts, which are based on management's best estimates. Accordingly, management believes that it is not practical to develop a meaningful range for any such changes in losses incurred.

During 2013, incurred claims and claims expense related to prior years was primarily composed of net decreases in auto reserves of $237 million primarily due to claim severity development that was better than expected, net decreases in homeowners reserves of $5 million due to favorable non-catastrophe reserve reestimates, net decreases in other reserves of $21 million, and net increases in Discontinued Lines and Coverages reserves of $142 million. Incurred claims and claims expense includes favorable catastrophe loss reestimates of $88 million, net of reinsurance and other recoveries.

During 2012, incurred claims and claims expense related to prior years was primarily composed of net decreases in auto reserves of $365 million primarily due to claim severity development that was better than expected, net decreases in homeowners reserves of $321 million due to favorable catastrophe reserve reestimates, net decreases in other reserves of $30 million, and net increases in Discontinued Lines and Coverages reserves of $51 million. Incurred claims and claims expense includes favorable catastrophe loss reestimates of $410 million, net of reinsurance and other recoveries.

During 2011, incurred claims and claims expense related to prior years was primarily composed of net decreases in auto reserves of $381 million primarily due to claim severity development that was better than expected, net decreases in homeowners reserves of $69 million due to favorable catastrophe reserve reestimates, net increases in other reserves of $94 million, and net increases in Discontinued Lines and Coverages reserves of $21 million. Incurred claims and claims expense includes favorable catastrophe loss reestimates of $130 million, net of reinsurance and other recoveries.

Management believes that the reserve for property-liability insurance claims and claims expense, net of reinsurance recoverables, is appropriately established in the aggregate and adequate to cover the ultimate net cost of reported and unreported claims arising from losses which had occurred by the date of the Consolidated Statements of Financial Position based on available facts, technology, laws and regulations.

For further discussion of asbestos and environmental reserves, see Note 15.