Erie Indemnity (ERIE) 10-Q 31 Oct 13 2013 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2013	Oct. 18, 2013	Oct. 18, 2013
		Class A Common Stock	Class B Common Stock
Entity Registrant Name	'ERIE INDEMNITY CO	'	'
Entity Central Index Key	'0000922621	'	'
Document Type	'10-Q	'	'
Amendment Flag	'false	'	'
Document Period End Date	30-Sep-13	'	'
Document Fiscal Year Focus	'2013	'	'
Document Fiscal Period Focus	'Q3	'	'
Current Fiscal Year End Date	'--12-31	'	'
Entity Well-known Seasoned Issuer	'Yes	'	'
Entity Current Reporting Status	'Yes	'	'
Entity Filer Category	'Large Accelerated Filer	'	'
Entity Common Stock, Shares Outstanding	'	46,563,694	2,542

CONSOLIDATED_STATEMENTS_OF_OPE

CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
In Millions, except Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Revenues	'	'	'	'	'
Premiums earned	$1,241	$1,137	$3,631	$3,333	'
Net investment income	109	105	316	326	'
Net realized investment gains (losses)	191	169	501	358	'
Net impairment losses recognized in earnings	-9	0	-10	0	'
Equity in earnings of limited partnerships	37	41	112	99	'
Other income	8	8	24	24	'
Total revenues	1,577	1,460	4,574	4,140	'
Benefits and expenses	'	'	'	'	'
Insurance losses and loss expenses	868	912	2,571	2,571	'
Policy acquisition and underwriting expenses	311	278	906	835	'
Total benefits and expenses	1,179	1,190	3,477	3,406	'
Income (loss) from operations before income taxes and noncontrolling interest	398	270	1,097	734	'
Provision for income taxes	131	86	363	234	'
Net income (loss)	267	184	734	500	619
Less: Net income attributable to noncontrolling interest in consolidated entity b Exchange	221	133	607	370	'
Net income attributable to Indemnity	46	51	127	130	'
Indemnity	'	'	'	'	'
Revenues	'	'	'	'	'
Net investment income	4	4	11	12	'
Net realized investment gains (losses)	1	2	1	4	'
Net impairment losses recognized in earnings	0	0	0	0	'
Benefits and expenses	'	'	'	'	'
Income (loss) from operations before income taxes and noncontrolling interest	70	78	193	197	'
Provision for income taxes	24	27	66	67	'
Net income (loss)	'	'	127	'	160
Net income attributable to Indemnity	$46	$51	$127	$130	'
Class A | Indemnity	'	'	'	'	'
Net income attributable to Indemnity per share	'	'	'	'	'
Common stock - basic (in dollars per share)	$0.98	$1.08	$2.71	$2.73	'
Common stock - diluted (in dollars per share)	$0.87	$0.96	$2.41	$2.43	'
Weighted average shares outstanding attributable to Indemnity - Basic	'	'	'	'	'
Common stock - basic (in shares)	46,656,911	47,188,741	46,707,971	47,476,693	'
Weighted average shares outstanding attributable to Indemnity - Diluted	'	'	'	'	'
Common stock - diluted (in shares)	52,851,250	53,374,846	52,902,310	53,662,798	'
Dividends declared per share	'	'	'	'	'
Common stock (in dollars per share)	$0.59	$0.55	$1.78	$1.66	$4.25
Class B | Indemnity	'	'	'	'	'
Net income attributable to Indemnity per share	'	'	'	'	'
Common stock - basic (in dollars per share)	$147	$162	$406	$411	'
Common stock - diluted (in dollars per share)	$147	$162	$406	$411	'
Weighted average shares outstanding attributable to Indemnity - Basic	'	'	'	'	'
Common stock - basic (in shares)	2,542	2,544	2,542	2,544	'
Weighted average shares outstanding attributable to Indemnity - Diluted	'	'	'	'	'
Common stock - diluted (in shares)	2,542	2,544	2,542	2,544	'
Dividends declared per share	'	'	'	'	'
Common stock (in dollars per share)	$88.88	$82.88	$266.63	$248.63	$637.50

CONSOLIDATED_STATEMENTS_OF_COM

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Statement of Comprehensive Income [Abstract]	'	'	'	'
Net income	$267	$184	$734	$500
Other comprehensive (loss) income	'	'	'	'
Change in unrealized holding (losses) gains on available-for-sale securities, net of tax (benefit) expense of $(12), $59, $(123), and $112, respectively	-23	110	-229	208
Reclassification adjustment for gross losses (gains) included in net income, net of tax (benefit) expense of $(12), $5, $(5), and $13, respectively	21	-11	8	-25
Other comprehensive (loss) income	-2	99	-221	183
Comprehensive income	265	283	513	683
Less: Comprehensive income attributable to noncontrolling interest in consolidated entity b Exchange	221	230	393	549
Total comprehensive income b Indemnity	$44	$53	$120	$134

CONSOLIDATED_STATEMENTS_OF_COM1

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Statement of Comprehensive Income [Abstract]	'	'	'	'
Change in unrealized holding (losses) gains on available-for-sale securities, tax (benefit) expense	($12)	$59	($123)	$112
Reclassification adjustment for gross losses (gains) included in net income, tax (benefit) expense	($12)	$5	($5)	$13

CONSOLIDATED_STATEMENTS_OF_FIN

CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Available-for-sale securities, at fair value:	'	'
Fixed maturities	$8,420	$8,159
Equity securities	897	1,000
Trading securities, at fair value	2,945	2,417
Limited partnerships	1,137	1,217
Other invested assets	21	21
Total investments	13,420	12,814
Cash and cash equivalents (Exchange portion of $502 and $388, respectively)	535	400
Premiums receivable from policyholders	1,203	1,062
Reinsurance recoverable	174	168
Deferred income taxes	42	37
Deferred acquisition costs	574	504
Other assets (Exchange portion of $329 and $339, respectively)	436	456
Total assets	16,384	15,441
Liabilities	'	'
Losses and loss expense reserves	3,712	3,598
Life policy and deposit contract reserves	1,754	1,708
Unearned premiums	2,654	2,365
Deferred income taxes	368	365
Total liabilities	9,185	8,650
Indemnity shareholders' equity	'	'
Total Indemnity shareholders' equity	657	642
Noncontrolling interest in consolidated entity - Exchange	6,542	6,149
Total equity	7,199	6,791
Total liabilities, shareholders' equity and noncontrolling interest	16,384	15,441
Indemnity	'	'
Available-for-sale securities, at fair value:	'	'
Fixed maturities	499	452
Equity securities	48	55
Trading securities, at fair value	0	0
Limited partnerships	158	180
Other invested assets	1	1
Total investments	706	688
Cash and cash equivalents (Exchange portion of $502 and $388, respectively)	33	12
Deferred income taxes	42	37
Other assets (Exchange portion of $329 and $339, respectively)	107	117
Total assets	1,233	1,160
Liabilities	'	'
Deferred income taxes	0	0
Other liabilities	574	515
Total liabilities	576	518
Indemnity shareholders' equity	'	'
Additional paid-in-capital	16	16
Accumulated other comprehensive loss	-140	-133
Retained earnings	1,896	1,852
Total contributed capital and retained earnings	1,774	1,737
Treasury stock, at cost, 21,695,943 and 21,406,519 shares, respectively	-1,117	-1,095
Total Indemnity shareholders' equity	657	642
Total equity	657	642
Total liabilities, shareholders' equity and noncontrolling interest	1,233	1,160
Exchange	'	'
Available-for-sale securities, at fair value:	'	'
Fixed maturities	7,921	7,707
Equity securities	849	945
Trading securities, at fair value	2,945	2,417
Limited partnerships	979	1,037
Other invested assets	20	20
Total investments	12,714	12,126
Cash and cash equivalents (Exchange portion of $502 and $388, respectively)	502	388
Premiums receivable from policyholders	1,203	1,062
Reinsurance recoverable	174	168
Deferred income taxes	0	0
Deferred acquisition costs	574	504
Other assets (Exchange portion of $329 and $339, respectively)	329	339
Total assets	15,496	14,587
Liabilities	'	'
Losses and loss expense reserves	3,712	3,598
Life policy and deposit contract reserves	1,754	1,708
Unearned premiums	2,654	2,365
Deferred income taxes	368	365
Other liabilities	123	99
Total liabilities	8,954	8,438
Indemnity shareholders' equity	'	'
Noncontrolling interest in consolidated entity - Exchange	6,542	6,149
Total equity	6,542	6,149
Total liabilities, shareholders' equity and noncontrolling interest	15,496	14,587
Class A | Indemnity	'	'
Indemnity shareholders' equity	'	'
Common stock	2	2
Class B | Indemnity	'	'
Indemnity shareholders' equity	'	'
Common stock	$0	$0

CONSOLIDATED_STATEMENTS_OF_FIN1

CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (Parenthetical) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Millions, except Share data, unless otherwise specified
Cash and cash equivalents	$535	$400
Other assets	436	456
Indemnity	'	'
Fixed maturities, amortized cost	491	437
Equity securities, cost	48	54
Limited partnerships, cost	133	151
Cash and cash equivalents	33	12
Other assets	107	117
Treasury stock (in shares)	21,695,943	21,406,519
Exchange	'	'
Fixed maturities, amortized cost	7,541	7,016
Equity securities, cost	809	871
Trading securities, cost	2,157	1,910
Limited partnerships, cost	836	913
Cash and cash equivalents	502	388
Other assets	$329	$339
Class A | Indemnity	'	'
Common stock, stated value per share (in dollars per share)	$0.03	$0.03
Common stock, authorized (in shares)	74,996,930	74,996,930
Common stock, issued (in shares)	68,299,200	68,299,200
Common stock, outstanding (in shares)	46,603,257	46,892,681
Class B | Indemnity	'	'
Ratio for converting shares of Class B common stock into shares of Class A common stock (as a percent)	2400.00%	2400.00%
Common stock, stated value per share (in dollars per share)	$70	$70
Common stock, authorized (in shares)	3,070	3,070
Common stock, issued (in shares)	2,542	2,542
Common stock, outstanding (in shares)	2,542	2,542

CONSOLIDATED_STATEMENTS_OF_CAS

CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities	'	'
Premiums collected	$3,780	$3,452
Net investment income received	337	346
Limited partnership distributions	125	94
Service agreement fee received	23	23
Commissions and bonuses paid to agents	-521	-470
Losses paid	-2,039	-2,050
Loss expenses paid	-343	-352
Other underwriting and acquisition costs paid	-465	-432
Income taxes paid	-208	-246
Net cash provided by (used in) operating activities	689	365
Purchase of investments:	'	'
Fixed maturities	-2,157	-1,466
Preferred stock	-94	-118
Common stock	-1,021	-750
Limited partnerships	-66	-64
Sales/maturities of investments:	'	'
Fixed maturity sales	716	535
Fixed maturity calls/maturities	881	877
Preferred stock	84	106
Common stock	1,057	733
Sale of and returns on limited partnerships	125	141
Net purchase of property and equipment	-24	-27
Net collections on agent loans	1	0
Net distributions on life policy loans	0	-1
Net cash provided by (used in) investing activities	-498	-34
Cash flows from financing activities	'	'
Annuity deposits and interest	68	72
Annuity surrenders and withdrawals	-58	-59
Universal life deposits and interest	20	17
Universal life surrenders	-8	-7
Purchase of treasury stock	-22	-55
Dividends paid to shareholders	-56	-80
Net cash provided by (used in) financing activities	-56	-112
Net increase (decrease) in cash and cash equivalents	135	219
Cash and cash equivalents at beginning of period	400	185
Cash and cash equivalents at end of period	$535	$404

Nature_of_Operations

Nature of Operations	9 Months Ended
	Sep. 30, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Nature of Operations	'
	Note 1.  Nature of Operations
	Erie Indemnity Company (“Indemnity”) is a publicly held Pennsylvania business corporation that has been the managing attorney-in-fact for the subscribers (policyholders) at the Erie Insurance Exchange (“Exchange”) since 1925.  The Exchange is a subscriber-owned, Pennsylvania-domiciled reciprocal insurer that writes property and casualty insurance.
	Indemnity’s primary function is to perform certain services for the Exchange relating to the sales, underwriting and issuance of policies on behalf of the Exchange.  This is done in accordance with a subscriber’s agreement (a limited power of attorney) executed by each subscriber (policyholder), which appoints Indemnity as their common attorney-in-fact to transact business on their behalf and to manage the affairs of the Exchange.  Pursuant to the subscriber’s agreement and for its services as attorney-in-fact, Indemnity earns a management fee calculated as a percentage of the direct premiums written by the Exchange and the other members of the Property and Casualty Group (defined below), which are assumed by the Exchange under an intercompany pooling arrangement.
	Indemnity has the power to direct the activities of the Exchange that most significantly impact the Exchange’s economic performance by acting as the common attorney-in-fact and decision maker for the subscribers (policyholders) at the Exchange.
	The Exchange, together with its wholly owned subsidiaries, Erie Insurance Company (“EIC”), Erie Insurance Company of New York (“ENY”), Erie Insurance Property and Casualty Company (“EPC”), and Flagship City Insurance Company (“Flagship”), operate as a property and casualty insurer and are collectively referred to as the “Property and Casualty Group”.  The Property and Casualty Group operates in 11 Midwestern, Mid-Atlantic and Southeastern states and the District of Columbia.
	Erie Family Life Insurance Company (“EFL”), a wholly owned subsidiary of the Exchange, operates as a life insurer that underwrites and sells individual and group life insurance policies and fixed annuities.
	Indemnity plans to expand the property and casualty and life insurance operations of the Erie Insurance Group into the Commonwealth of Kentucky by early 2015.
	All property and casualty and life insurance operations are owned by the Exchange and Indemnity functions solely as the management company.
	The consolidated financial statements of Erie Indemnity Company reflect the results of Indemnity and its variable interest entity, the Exchange, which we refer to collectively as the “Erie Insurance Group” (“we,” “us,” “our”).
	“Indemnity shareholder interest” refers to the interest in Erie Indemnity Company owned by the Class A and Class B shareholders.  “Noncontrolling interest” refers to the interest in the Erie Insurance Exchange held for the subscribers (policyholders).

Significant_Accounting_Policie

Significant Accounting Policies	9 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
Significant Accounting Policies	'
	Note 2.  Significant Accounting Policies
	Basis of presentation
	The accompanying consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles (“GAAP”) and include the accounts of Indemnity together with its affiliate companies in which Indemnity holds a majority voting or economic interest.
	Use of estimates
	The preparation of financial statements in conformity with GAAP requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period.  Actual results could differ from those estimates.
	In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation of our financial position, results of operations and cash flows for the interim periods have been included.  Operating results for the nine months ended September 30, 2013 are not necessarily indicative of the results that may be expected for the year ended December 31, 2013.  The accompanying consolidated financial statements and notes should be read in conjunction with the consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2012 as filed with the Securities and Exchange Commission on February 26, 2013.
	Principles of consolidation
	We consolidate the Exchange as a variable interest entity for which Indemnity is the primary beneficiary.  All intercompany accounts and transactions have been eliminated in consolidation.  The required presentation of noncontrolling interests is reflected in the consolidated financial statements.  Noncontrolling interests represent the ownership interests of the Exchange, all of which are held by parties other than Indemnity (i.e. the Exchange’s subscribers (policyholders)).  Noncontrolling interests also include the Exchange subscribers’ ownership interest in EFL.
	Presentation of assets and liabilities – While the assets of the Exchange are presented separately in the Consolidated Statements of Financial Position, the Exchange’s assets can only be used to satisfy the Exchange’s liabilities or for other unrestricted activities.  Accounting Standards Codification (“ASC”) 810, Consolidation, does not require separate presentation of the Exchange’s assets; however, because the shareholders of Indemnity have no rights to the assets of the Exchange and, conversely, the Exchange has no rights to the assets of Indemnity, we have presented the invested assets of the Exchange separately on the Consolidated Statements of Financial Position along with the remaining consolidated assets reflecting the Exchange’s portion parenthetically.  Liabilities are required under ASC 810, Consolidation, to be presented separately for the Exchange on the Consolidated Statements of Financial Position as the Exchange’s creditors do not have recourse to the general credit of Indemnity.
	Rights of shareholders of Indemnity and subscribers (policyholders) of the Exchange – The shareholders of Indemnity, through the management fee, have a controlling financial interest in the Exchange; however, they have no other rights to or obligations arising from assets and liabilities of the Exchange.  The shareholders of Indemnity own its equity but have no rights or interest in the Exchange’s (noncontrolling interest) income or equity.  The noncontrolling interest equity represents the Exchange’s equity held for the interest of its subscribers (policyholders), who have no rights or interest in the Indemnity shareholder interest income or equity.
	All intercompany assets, liabilities, revenues and expenses between Indemnity and the Exchange have been eliminated in the Consolidated Financial Statements.
	Adopted accounting pronouncements
	In February 2013, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2013-02, Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income.  The amendments in this ASU require an entity to present, either on the face of the statement where net income is presented or in the notes, significant amounts reclassified out of accumulated other comprehensive income by the line items affected by the reclassification. For amounts that are not required to be reclassified in their entirety to net income, an entity is required to cross-reference to other related disclosures for additional information. ASU 2013-02 is effective prospectively for interim and annual periods beginning after December 15, 2012.  We have elected to present amounts reclassified out of accumulated other comprehensive income by component and the respective line items of net income in the notes to our consolidated financial statements. See Note 12. "Indemnity's Accumulated Other Comprehensive Loss".
	Pending accounting pronouncements
	In February 2013, the FASB issued ASU 2013-04, Obligations Resulting from Joint and Several Liability Arrangements for Which the Total Amount of the Obligation Is Fixed at the Reporting Date. The amendments in this ASU provide guidance for the recognition, measurement, and disclosure of obligations resulting from joint and several liability arrangements for which the total amount of the obligation within the scope of this guidance is fixed at the reporting date, except for obligations addressed within existing guidance in GAAP. ASU 2013-04 is effective for interim and annual periods beginning after December 15, 2013, with early adoption permitted.  We do not expect the adoption of this new guidance to have a material impact on our consolidated financial statements.

Indemnity_Earnings_Per_Share

Indemnity Earnings Per Share	9 Months Ended
	Sep. 30, 2013
Earnings Per Share [Abstract]	'
Indemnity Earnings Per Share	'
	Note 3.  Indemnity Earnings Per Share
	Class A and Class B basic earnings per share and Class B diluted earnings per share are calculated under the two-class method. The two-class method allocates earnings to each class of stock based upon its dividend rights.  Class B shares are convertible into Class A shares at a conversion ratio of 2,400 to 1. See Note 11. “Indemnity Capital Stock”.
	Class A diluted earnings per share are calculated under the if-converted method, which reflects the conversion of Class B shares to Class A shares. Diluted earnings per share calculations include the effect of any potential common shares. Potential common shares include outstanding vested and not yet vested awards related to our outside directors’ stock compensation plan and any employee stock based awards.
	A reconciliation of the numerators and denominators used in the basic and diluted per-share computations is presented as follows for each class of Indemnity common stock:
		Indemnity Shareholder Interest
	(dollars in millions, except per share data)	Three months ended September 30,
		2013					2012
		Allocated net income (numerator)		Weighted shares (denominator)	Per-share amount		Allocated net income (numerator)		Weighted shares (denominator)	Per- share amount
	Class A – Basic EPS:
	Income available to Class A stockholders	$	46	46,656,911	$	0.98	$	51	47,188,741	$	1.08
	Dilutive effect of stock-based awards	0		93,539	—		0		80,505	—
	Assumed conversion of Class B shares	0		6,100,800	—		0		6,105,600	—
	Class A – Diluted EPS:
	Income available to Class A stockholders on Class A equivalent shares	$	46	52,851,250	$	0.87	$	51	53,374,846	$	0.96
	Class B – Basic and diluted EPS:
	Income available to Class B stockholders	$	0	2,542	$	147	$	0	2,544	$	162
		Indemnity Shareholder Interest
	(dollars in millions, except per share data)	Nine months ended September 30,
		2013					2012
		Allocated net income (numerator)		Weighted shares (denominator)	Per-share amount		Allocated net income (numerator)		Weighted shares (denominator)	Per- share amount
	Class A – Basic EPS:
	Income available to Class A stockholders	$	126	46,707,971	$	2.71	$	129	47,476,693	$	2.73
	Dilutive effect of stock-based awards	0		93,539	—		0		80,505	—
	Assumed conversion of Class B shares	1		6,100,800	—		1		6,105,600	—
	Class A – Diluted EPS:
	Income available to Class A stockholders on Class A equivalent shares	$	127	52,902,310	$	2.41	$	130	53,662,798	$	2.43
	Class B – Basic and diluted EPS:
	Income available to Class B stockholders	$	1	2,542	$	406	$	1	2,544	$	411

Variable_Interest_Entity

Variable Interest Entity	9 Months Ended
	Sep. 30, 2013
Variable Interest Entity [Abstract]	'
Variable Interest Entity	'
	Note 4.  Variable Interest Entity
	Erie Insurance Exchange
	The Exchange is a reciprocal insurance exchange domiciled in Pennsylvania, for which Indemnity serves as attorney-in-fact.  Indemnity holds a variable interest in the Exchange due to the absence of decision-making capabilities by the equity owners (subscribers/policyholders) of the Exchange and due to the significance of the management fee the Exchange pays to Indemnity as its decision maker.  As a result, Indemnity is deemed to have a controlling financial interest in the Exchange and is considered to be its primary beneficiary.
	Consolidation of the Exchange’s financial results is required given the significance of the management fee to the Exchange and because Indemnity has the power to direct the activities of the Exchange that most significantly impact the Exchange’s economic performance.  The Exchange’s anticipated economic performance is the product of its underwriting results combined with its investment results.  The fees paid to Indemnity under the subscriber’s agreement impact the anticipated economic performance attributable to the Exchange’s results.  Indemnity earns a management fee from the Exchange for the services it provides as attorney-in-fact.  Indemnity’s management fee revenues are based on all premiums written or assumed by the Exchange.  Indemnity’s Board of Directors determines the management fee rate to be paid by the Exchange to Indemnity.  This rate cannot exceed 25% of the direct and assumed written premiums of the Exchange, as defined by the subscriber’s agreement signed by each policyholder.  Management fee revenues and management fee expenses are eliminated upon consolidation.
	The shareholders of Indemnity have no rights to the assets of the Exchange and no obligations arising from the liabilities of the Exchange.  Indemnity has no obligation related to any underwriting and/or investment losses experienced by the Exchange.  Indemnity would, however, be adversely impacted if the Exchange incurred significant underwriting and/or investment losses.  If the surplus of the Exchange were to decline significantly from its current level, its financial strength ratings could be reduced and, as a consequence, the Exchange could find it more difficult to retain its existing business and attract new business.  A decline in the business of the Exchange would have an adverse effect on the amount of the management fees Indemnity receives.  In addition, a decline in the surplus of the Exchange from its current level may impact the management fee rate received by Indemnity.  Indemnity also has an exposure to a concentration of credit risk related to the unsecured receivables due from the Exchange for its management fee. If any of these events occurred, Indemnity’s financial position, financial performance and/or cash flows could be adversely impacted.
	All property and casualty and life insurance operations are owned by the Exchange, and Indemnity functions solely as the management company.
	Indemnity has not provided financial or other support to the Exchange for any the reporting periods presented.  At September 30, 2013, there are no explicit or implicit arrangements that would require Indemnity to provide future financial support to the Exchange.  Indemnity is not liable if the Exchange was to be in violation of its debt covenants or was unable to meet its obligation for unfunded commitments to limited partnerships.

Segment_Information

Segment Information	9 Months Ended
	Sep. 30, 2013
Segment Reporting [Abstract]	'
Segment Information	'
	Note 5. Segment Information
	Our reportable segments include management operations, property and casualty insurance operations, life insurance operations and investment operations.  Accounting policies for segments are the same as those described in the summary of significant accounting policies.  See Item 8. “Financial Statements and Supplementary Data, Note 2. Significant Accounting Policies,” in our Annual Report on Form 10-K for the year ended December 31, 2012 as filed with the Securities and Exchange Commission on February 26, 2013.  Assets are not allocated to the segments, but rather, are reviewed in total for purposes of decision-making.  No single customer or agent provides 10% or more of revenues.
	Management operations
	Our management operations segment consists of Indemnity serving as attorney-in-fact for the Exchange.  Indemnity operates in this capacity solely for the Exchange.  We evaluate profitability of our management operations segment principally on the gross margin from management operations.  Indemnity earns a management fee from the Exchange for providing sales, underwriting and policy issuance services.  Management fee revenue, which is eliminated upon consolidation, is calculated as a percentage not to exceed 25% of all the direct premiums written by the Exchange and the other members of the Property and Casualty Group, which are assumed by the Exchange under an intercompany pooling arrangement.  The Property and Casualty Group issues policies with annual terms only.  Management fees are recorded upon policy issuance or renewal, as substantially all of the services required to be performed by Indemnity have been satisfied at that time.  Certain activities are performed and related costs are incurred by us subsequent to policy issuance in connection with the services provided to the Exchange; however, these activities are inconsequential and perfunctory.  Although these management fee revenues and expenses are eliminated upon consolidation, the amount of the fee directly impacts the allocation of our consolidated net income between the noncontrolling interest, which bears the management fee expense and represents the interests of the Exchange subscribers (policyholders), and Indemnity’s interest, which earns the management fee revenue and represents the Indemnity shareholder interest in net income.
	Additionally, the nine months ended September 30, 2012 included an adjustment that reduced commission expense by $6 million which occurred in the second quarter of 2012. This amount represents the reimbursement by the North Carolina Reinsurance Facility (NCRF) for commissions Indemnity paid to agents on the surcharges collected on behalf of the NCRF which was incorrectly recorded as a benefit to the Exchange in prior periods.
	Property and casualty insurance operations
	Our property and casualty insurance operations segment includes personal and commercial lines.  Personal lines consist primarily of personal auto and homeowners and are marketed to individuals.  Commercial lines consist primarily of commercial multi-peril, commercial auto and workers compensation and are marketed to small- and medium-sized businesses.  Our property and casualty policies are sold by independent agents.  Our property and casualty insurance underwriting operations are conducted through the Exchange and its subsidiaries and include assumed voluntary reinsurance from nonaffiliated domestic and foreign sources, assumed involuntary and ceded reinsurance business.  The Exchange exited the assumed voluntary reinsurance business effective December 31, 2003, and therefore unaffiliated reinsurance includes only run-off activity of the previously assumed voluntary reinsurance business.  We evaluate profitability of the property and casualty insurance operations principally based upon net underwriting results represented by the combined ratio.
	Life insurance operations
	Our life insurance operations segment includes traditional and universal life insurance products and fixed annuities marketed to individuals using the same independent agency force utilized by our property and casualty insurance operations.  We evaluate profitability of the life insurance segment principally based upon segment net income, including investments, which for segment purposes are reflected in the investment operations segment.  At the same time, we recognize that investment-related income is integral to the evaluation of the life insurance segment because of the long duration of life products.  For the third quarters of 2013 and 2012, investment activities on life insurance related assets generated revenues of $26 million and $25 million, respectively, resulting in EFL reporting income before income taxes of $10 million and $12 million, respectively, before intercompany eliminations. For the nine months ended September 30, 2013 and 2012, investment activities on life insurance related assets generated revenues of $78 million and $77 million, respectively, resulting in EFL reporting income before income taxes of $34 million for both periods, before intercompany eliminations.
	Investment operations
	The investment operations segment includes returns from our fixed maturity, equity security and limited partnership investment portfolios to support our underwriting business.  The Indemnity and Exchange portfolios are managed with the objective of maximizing after-tax returns on a risk-adjusted basis, while the EFL portfolio is managed to be closely aligned to its liabilities and to maintain a sufficient yield to meet profitability targets.  Management actively evaluates the portfolios for impairments. We record impairment writedowns on investments in instances where the fair value of the investment is substantially below cost, and we conclude that the decline in fair value is other-than-temporary.  Investment related income for the life operations is included in the investment segment results.
	The following tables summarize the components of the Consolidated Statements of Operations by reportable business segment:
		Erie Insurance Group
	(in millions)	Three months ended September 30, 2013
		Management		Property			Life			Investment			Eliminations			Consolidated
		operations		and casualty			insurance			operations
				insurance			operations
				operations
	Premiums earned/life policy revenue			$	1,221		$	21					$	(1	)	$	1,241
	Net investment income									$	111		(2		)	109
	Net realized investment gains									191						191
	Net impairment losses recognized in earnings									(9		)				(9		)
	Equity in earnings of limited partnerships									37						37
	Management fee revenue	$	333										(333		)	—
	Service agreement and other revenue	8					0									8
	Total revenues	341		1,221			21			330			(336		)	1,577
	Cost of management operations	281											(281		)	—
	Insurance losses and loss expenses			841			28						(1		)	868
	Policy acquisition and underwriting expenses			356			9						(54		)	311
	Total benefits and expenses	281		1,197			37			—			(336		)	1,179
	Income (loss) before income taxes	60		24			(16		)	330			—			398
	Provision for income taxes	21		8			(5		)	107			—			131
	Net income (loss)	$	39	$	16		$	(11	)	$	223		—			$	267
		Erie Insurance Group
	(in millions)	Three months ended September 30, 2012
		Management		Property			Life			Investment			Eliminations			Consolidated
		operations		and casualty			insurance			operations
				insurance			operations
				operations
	Premiums earned/life policy revenue			$	1,118		$	19					$	0		$	1,137
	Net investment income									$	108		(3		)	105
	Net realized investment gains									169						169
	Net impairment losses recognized in earnings									0						0
	Equity in earnings of limited partnerships									41						41
	Management fee revenue	$	305										(305		)	—
	Service agreement and other revenue	8					0									8
	Total revenues	313		1,118			19			318			(308		)	1,460
	Cost of management operations	247											(247		)	—
	Insurance losses and loss expenses			890			24						(2		)	912
	Policy acquisition and underwriting expense			329			8						(59		)	278
	Total benefits and expenses	247		1,219			32			—			(308		)	1,190
	Income (loss) before income taxes	66		(101		)	(13		)	318			—			270
	Provision for income taxes	23		(36		)	(4		)	103			—			86
	Net income (loss)	$	43	$	(65	)	$	(9	)	$	215		$	—		$	184
		Erie Insurance Group
	(in millions)	Nine months ended September 30, 2013
		Management		Property			Life			Investment			Eliminations			Consolidated
		operations		and casualty			insurance			operations
				insurance			operations
				operations
	Premiums earned/life policy revenue			$	3,573		$	60					$	(2	)	$	3,631
	Net investment income									$	324		(8		)	316
	Net realized investment gains									501						501
Net impairment losses recognized in earnings									(10		)				(10		)
Equity in earnings of limited partnerships									112						112
Management fee revenue	$	965										(965		)	—
Service agreement and other revenue	23					1									24
Total revenues	988		3,573			61			927			(975		)	4,574
Cost of management operations	820											(820		)	—
Insurance losses and loss expenses			2,495			80						(4		)	2,571
Policy acquisition and underwriting expenses			1,032			25						(151		)	906
Total benefits and expenses	820		3,527			105			—			(975		)	3,477
Income (loss) before income taxes	168		46			(44		)	927			—			1,097
Provision for income taxes	59		16			(15		)	303			—			363
Net income (loss)	$	109	$	30		$	(29	)	$	624		$	—		$	734
	Erie Insurance Group
(in millions)	Nine months ended September 30, 2012
	Management operations		Property			Life insurance operations			Investment operations			Eliminations			Consolidated
			and casualty
			insurance
			operations
Premiums earned/life policy revenue			$	3,279		$	55					$	(1	)	$	3,333
Net investment income									$	334		(8		)	326
Net realized investment gains									358						358
Net impairment losses recognized in earnings									0						0
Equity in earnings of limited partnerships									99						99
Management fee revenue	$	882										(882		)	—
Service agreement and other revenue	23					1									24
Total revenues	905		3,279			56			791			(891		)	4,140
Cost of management operations	734											(734		)	—
Insurance losses and loss expenses			2,501			74						(4		)	2,571
Policy acquisition and underwriting expenses			963			25						(153		)	835
Total benefits and expenses	734		3,464			99			—			(891		)	3,406
Income (loss) before income taxes	171		(185		)	(43		)	791			—			734
Provision for income taxes	60		(65		)	(15		)	254			—			234
Net income (loss)	$	111	$	(120	)	$	(28	)	$	537		$	—		$	500

Fair_Value

Fair Value	9 Months Ended
	Sep. 30, 2013
Fair Value Disclosures [Abstract]	'
Fair Value	'
	Note 6. Fair Value
	Our available-for-sale and trading securities are recorded at fair value, which is the price that would be received to sell the asset in an orderly transaction between willing market participants as of the measurement date.
	Valuation techniques used to derive the fair value of our available-for-sale and trading securities are based upon observable and unobservable inputs.  Observable inputs reflect market data obtained from independent sources.  Unobservable inputs reflect our own assumptions regarding fair market value for these securities.  Although the majority of our prices are obtained from third party sources, we also perform an internal pricing review for securities with low trading volumes under current market conditions. Financial instruments are categorized based upon the following characteristics or inputs to the valuation techniques:
	•	Level 1 – Quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity can access at the measurement date.
	•	Level 2 – Inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly.
	•	Level 3 – Unobservable inputs for the asset or liability.
	Estimates of fair values for our investment portfolio are obtained primarily from a nationally recognized pricing service.  Our Level 1 category includes those securities valued using an exchange traded price provided by the pricing service.  The methodologies used by the pricing service that support a Level 2 classification of a financial instrument include multiple verifiable, observable inputs including benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers and reference data.  Pricing service valuations for Level 3 securities are based upon proprietary models and are used when observable inputs are not available or in illiquid markets.
	In limited circumstances we adjust the price received from the pricing service when, in our judgment, a better reflection of fair value is available based upon corroborating information and our knowledge and monitoring of market conditions such as a disparity in price of comparable securities and/or non-binding broker quotes.  In other circumstances, certain securities are internally priced because prices are not provided by the pricing service.
	We perform continuous reviews of the prices obtained from the pricing service.  This includes evaluating the methodology and inputs used by the pricing service to ensure that we determine the proper classification level of the financial instrument.  Price variances, including large periodic changes, are investigated and corroborated by market data.  We have reviewed the pricing methodologies of our pricing service as well as other observable inputs, such as data, and transaction volumes and believe that their prices adequately consider market activity in determining fair value.  Our review process continues to evolve based upon accounting guidance and requirements.
	When a price from the pricing service is not available, values are determined by obtaining broker/dealer quotes and/or market comparables.  When available, we obtain multiple quotes for the same security.  The ultimate value for these securities is determined based upon our best estimate of fair value using corroborating market information.  Our evaluation includes the consideration of benchmark yields, reported trades, issuer spreads, two-sided markets, benchmark securities, bids, offers and reference data.
	For certain securities in an illiquid market, there may be no prices available from a pricing service and no comparable market quotes available.  In these situations, we value the security using an internally-developed, risk-adjusted discounted cash flow model.
	The following table represents our consolidated fair value measurements on a recurring basis by asset class and level of input at September 30, 2013:
			Erie Insurance Group
			30-Sep-13
			Fair value measurements using:
	(in millions)		Total		Quoted prices in			Observable inputs			Unobservable inputs
					active markets for identical assets			Level 2			Level 3
					Level 1
	Indemnity
	Available-for-sale securities:
	States & political subdivisions		$	219	$	0		$	219		$	0
	Corporate debt securities		279		0			278			1
	Collateralized debt obligations		1		0			0			1
	Total fixed maturities		499		0			497			2
	Nonredeemable preferred stock		23		2			21			0
	Common stock		25		25			0			0
	Total available-for-sale securities		547		27			518			2
	Other investments (1)		19		0			0			19
	Total – Indemnity		$	566	$	27		$	518		$	21
	Exchange
	Available-for-sale securities:
	U.S. government & agencies		$	173	$	0		$	173		$	0
	States & political subdivisions		1,431		0			1,431			0
	Foreign government securities		15		0			15			0
	Corporate debt securities		5,969		0			5,943			26
	Residential mortgage-backed securities		199		0			199			0
	Commercial mortgage-backed securities		48		0			48			0
	Collateralized debt obligations		20		0			11			9
	Other debt securities		66		0			66			0
	Total fixed maturities		7,921		0			7,886			35
	Nonredeemable preferred stock		611		230			381			0
	Common stock		238		238			0			0
	Total available-for-sale securities		8,770		468			8,267			35
	Trading securities:
	Common stock		2,945		2,931			0			14
	Total trading securities		2,945		2,931			0			14
	Other investments (1)		100		0			0			100
	Total – Exchange		$	11,815	$	3,399		$	8,267		$	149
	Total – Erie Insurance Group		$	12,381	$	3,426		$	8,785		$	170
	(1)          Other investments measured at fair value represent four real estate funds included on the balance sheet as limited partnership investments that are reported under the fair value option. These investments can never be redeemed with the funds. Instead, distributions are received when liquidation of the underlying assets of the funds occur. It is estimated that the underlying assets will generally be liquidated between 5 and 10 years from the inception of the funds. The fair value of these investments is based on the net asset value (NAV) information provided by the general partner. Fair value is based on our proportionate share of the NAV based on the most recent partners' capital statements received from the general partners, which is generally one quarter prior to our balance sheet date. These values are then analyzed to determine if they represent the NAV at our balance sheet date, with adjustment being made where appropriate. We consider observable market data and perform a review validating the appropriateness of the NAV at each balance sheet date. It is likely that all of the investments will be redeemed at a future date for an amount different than the NAV of our ownership interest in partners' capital as of September 30, 2013. During the nine months ended September 30, 2013, Indemnity made no contributions and received distributions totaling $1.4 million, and the Exchange made no contributions and received distributions totaling $18.3 million for these investments. As of September 30, 2013, the amount of unfunded commitments related to the investments was $1.5 million for Indemnity and $4.5 million for the Exchange.
	Level 3 Assets – Quarterly Change:
			Erie Insurance Group
	(in millions)		Beginning balance at June 30, 2013		Included in			Included			Purchases		Sales			Transfers			Ending balance at September 30, 2013
					earnings (1)			in other comprehensive								in and (out) of
								income								Level 3 (2)
	Indemnity
	Available-for-sale securities:
	Corporate debt securities		$	1	$	0		$	0		$	0	$	0		$	0		$	1
	Collateralized debt obligations		1		0			0			0		0			0			1
	Total fixed maturities		2		0			0			0		0			0			2
	Total available-for-sale securities		2		0			0			0		0			0			2
	Other investments		20		0			0			0		(1		)	0			19
	Total Level 3 assets – Indemnity		$	22	$	0		$	0		$	0	$	(1	)	$	0		$	21
Exchange
Available-for-sale securities:
Corporate debt securities		$	33	$	0		$	0		$	0	$	0		$	(7	)	$	26
Commercial mortgage-backed securities		4		0			0			0		0			(4		)	0
Collateralized debt obligations		12		0			0			0		(3		)	0			9
Total fixed maturities		49		0			0			0		(3		)	(11		)	35
Nonredeemable preferred stock		7		0			(3		)	0		(4		)	0			0
Total available-for-sale securities		56		0			(3		)	0		(7		)	(11		)	35
Trading securities:
Common stock		7		3			0			4		0			0			14
Total trading securities		7		3			0			4		0			0			14
Other investments		113		3			0			0		(16		)	0			100
Total Level 3 assets – Exchange		$	176	$	6		$	(3	)	$	4	$	(23	)	$	(11	)	$	149
Total Level 3 assets – Erie Insurance Group		$	198	$	6		$	(3	)	$	4	$	(24	)	$	(11	)	$	170
-1	These amounts are reported in the Consolidated Statement of Operations. There is $3 million included in net realized investment gains (losses) and $3 million included in equity in earnings of limited partnerships for the three months ended September 30, 2013 on Level 3 securities.
-2	Transfers in and out of Level 3 are attributable to changes in the availability of market observable information for individual securities within the respective categories. Transfers in and out of levels are recognized at the start of the period.
We review the fair value hierarchy classifications each reporting period.  Transfers between hierarchy levels may occur due to changes in the available market observable inputs.  Transfers in and out of level classifications are reported as having occurred at the beginning of the quarter in which the transfers occurred.
For Indemnity, there were no transfers between Level 1 and Level 2 or between Level 2 and Level 3 for the three months ended September 30, 2013.
For the Exchange, there were no transfers between Level 1 and Level 2 or from Level 2 to Level 3 for the three months ended September 30, 2013. Level 3 to Level 2 transfers totaled $11 million for two fixed maturity holdings. These transfers out of Level 3 were primarily the result of using observable market data to determine the fair value at September 30, 2013.
Level 3 Assets – Year-to-Date Change:
		Erie Insurance Group
(in millions)		Beginning balance at December 31, 2012		Included in			Included			Purchases		Sales			Transfers			Ending balance at September 30, 2013
				earnings (1)			in other comprehensive								in and (out) of
							income								Level 3 (2)
Indemnity
Available-for-sale securities:
Corporate debt securities		$	1	$	0		$	0		$	0	$	0		$	0		$	1
Collateralized debt obligations		3		0			0			0		(2		)	0			1
Total fixed maturities		4		0			0			0		(2		)	0			2
Total available-for-sale securities		4		0			0			0		(2		)	0			2
Other investments		19		1			0			0		(1		)	0			19
Total Level 3 assets – Indemnity		$	23	$	1		$	0		$	0	$	(3	)	$	0		$	21
Exchange
Available-for-sale securities:
Corporate debt securities		$	43	$	0		$	0		$	1	$	(3	)	$	(15	)	$	26
Commercial mortgage-backed securities		0		0			0			0		(1		)	1			0
Collateralized debt obligations		16		2			0			0		(10		)	1			9
Total fixed maturities		59		2			0			1		(14		)	(13		)	35
Nonredeemable preferred stock		0		2			(1		)	4		(10		)	5			0
Total available-for-sale securities		59		4			(1		)	5		(24		)	(8		)	35
Trading securities:
Common stock		15		0			0			4		(5		)	0			14
Total trading securities		15		0			0			4		(5		)	0			14
Other investments		109		9			0			0		(18		)	0			100
Total Level 3 assets – Exchange		$	183	$	13		$	(1	)	$	9	$	(47	)	$	(8	)	$	149
Total Level 3 assets – Erie Insurance Group		$	206	$	14		$	(1	)	$	9	$	(50	)	$	(8	)	$	170
-1	These amounts are reported in the Consolidated Statement of Operations. There is $4 million included in net realized investment gains (losses) and $10 million included in equity in earnings of limited partnerships for the nine months ended September 30, 2013 on Level 3 securities.
-2	Transfers in and out of Level 3 are attributable to changes in the availability of market observable information for individual securities within the respective categories. Transfers in and out of levels are recognized at the start of the period.
For Indemnity, there were no Level 1 to Level 2 transfers for the nine months ended September 30, 2013. Level 2 to Level 1 transfers totaled $1 million due to trading activity levels related to one preferred stock holding, and there were no transfers between Levels 2 and 3.
For the Exchange, Level 1 to Level 2 transfers totaled $6 million and Level 2 to Level 1 transfers totaled $51 million due to trading activity levels related to one preferred stock holding and five preferred stock holdings, respectively, for the nine months ended September 30, 2013. Level 2 to Level 3 transfers totaled $39 million for seven fixed maturity holdings and one preferred stock holding, and Level 3 to Level 2 transfers totaled $47 million for six fixed maturity holdings. These transfers in and out of Level 3 were primarily the result of using non-binding and binding broker quotes, respectively, to determine the fair value at September 30, 2013.
Quantitative and Qualitative Disclosures about Unobservable Inputs
		Erie Insurance Group
		30-Sep-13
(dollars in millions)		Fair		No. of		Valuation techniques	Unobservable input		Range	Weighted
		value		holdings						average
Indemnity
Corporate debt securities		$	1	1		Market approach	Non-binding broker quote		112.32
Collateralized debt obligations		1		2		Income approach	Projected maturity date		Mar 2014 - Jul 2015
							Repayment at maturity		35 - 100%	70.00%
							Discount rate		7.5 - 15.0%	11.00%
Other investments		$	19	2		See (1) below
Total Level 3 assets – Indemnity		$	21	5
Exchange
Corporate debt securities		26		7		Market approach	Non-binding broker quote		107.40 - 115.50	110
							Comparable transaction EBITDA multiples		6.7 - 17.1x	8.0x
							Comparable security yield		6.00%
Collateralized debt obligations		6		4		Income approach	Projected maturity date		Mar 2014 - Oct 2035
							Repayment at maturity		35 - 100%	90.00%
							Discount rate		7.0 - 18.0%	9.00%
							Projected LIBOR rate		0.26%
		3		3		Market approach	Non-binding broker quote		21.00 - 64.00	51
Common stock		14		4		Market approach	Comparable transaction EBITDA multiples		6.7 - 17.1x	8.0x
							Discount for lack of marketability		5 - 30%	30%
Other investments		100		4		See (1) below
Total Level 3 assets – Exchange		$	149	22
Total Level 3 assets – Erie Insurance Group		$	170	27
-1	Other investments representing certain limited partnerships are recorded at fair value and are based upon net asset value (NAV) provided by the general partner where the unobservable inputs are not reasonably available to us.
Securities valued using unobservable inputs shown above totaled $170 million at September 30, 2013. Level 3 assets represent less than 1.4% of the total assets measured at fair value on a recurring basis for the Erie Insurance Group.
Corporate debt securities – The unobservable input used in the fair value measurement of certain corporate debt securities is the likelihood of repayment by the underlying entity when there is no market for trading these securities.  When available, we obtain non-binding broker quotes to value such securities.
Collateralized-debt-obligation securities – The unobservable inputs used in the fair value measurement of certain collateralized-debt-obligation securities are the repayment at maturity of underlying collateral available to pay note holders, the projected maturity of the underlying security, an expectation that the London Inter-Bank Offer Rates (“LIBOR”) do not change until maturity and a discount rate appropriate for the security.  Significant changes in any of those inputs in isolation would result in a significantly higher or lower fair value measurement.  Generally, a change in the assumption used for the performance of the underlying collateral is accompanied by an opposite change in the maturity and a directionally opposite change in the discount rate used to value the security.  LIBOR assumptions are independent of collateral performance.
Collateralized-debt-obligation securities and Corporate debt securities – When a non-binding broker quote was the only input available, it was considered unobservable.
Common stock investments and Corporate debt securities – The unobservable inputs used in the fair value measurement of direct private equity common stock investments and certain corporate debt securities are comparable private transaction earnings before interest, taxes, depreciation and amortization (“EBITDA”) multiples, the average EBITDA multiple for comparable publicly traded companies and the amount of discount applied to the price due to the illiquidity of the securities being valued.  Significant changes in any of those inputs in isolation could result in a significantly higher or lower fair value measurement.
The following table represents our consolidated fair value measurements on a recurring basis by asset class and level of input at December 31, 2012:
		Erie Insurance Group
		31-Dec-12
		Fair value measurements using:
(in millions)		Total		Quoted prices in			Observable			Unobservable
				active markets for			inputs			inputs
				identical assets			Level 2			Level 3
				Level 1
Indemnity
Available-for-sale securities:
States & political subdivisions		$	185	$	0		$	185		$	0
Corporate debt securities		261		0			260			1
Commercial mortgage-backed securities		3		0			3			0
Collateralized debt obligations		3		0			0			3
Total fixed maturities		452		0			448			4
Nonredeemable preferred stock		29		4			25			0
Common stock		26		26			0			0
Total available-for-sale securities		507		30			473			4
Other investments (1)		19		0			0			19
Total – Indemnity		$	526	$	30		$	473		$	23
Exchange
Available-for-sale securities:
U.S. government & agencies		$	191	$	0		$	191		$	0
States & political subdivisions		1,321		0			1,321			0
Foreign government securities		16		0			16			0
Corporate debt securities		5,777		0			5,734			43
Residential mortgage-backed securities		231		0			231			0
Commercial mortgage-backed securities		67		0			67			0
Collateralized debt obligations		49		0			33			16
Other debt securities		55		0			55			0
Total fixed maturities		7,707		0			7,648			59
Nonredeemable preferred stock		631		199			432			0
Common stock		314		314			0			0
Total available-for-sale securities		8,652		513			8,080			59
Trading securities:
Common stock		2,417		2,402			0			15
Total trading securities		2,417		2,402			0			15
Other investments (1)		109		0			0			109
Total – Exchange		$	11,178	$	2,915		$	8,080		$	183
Total – Erie Insurance Group		$	11,704	$	2,945		$	8,553		$	206
(1)          Other investments measured at fair value represent four real estate funds included on the balance sheet as limited partnership investments that are reported under the fair value option. These investments can never be redeemed with the funds. Instead, distributions are received when liquidation of the underlying assets of the funds occur. It is estimated that the underlying assets will generally be liquidated between 5 and 10 years from the inception of the funds. The fair value of these investments is based on the net asset value (NAV) information provided by the general partner. Fair value is based on our proportionate share of the NAV based on the most recent partners' capital statements received from the general partners, which is generally one quarter prior to our balance sheet date. These values are then analyzed to determine if they represent the NAV at our balance sheet date, with adjustment being made where appropriate. We consider observable market data and perform a review validating the appropriateness of the NAV at each balance sheet date. It is likely that all of the investments will be redeemed at a future date for an amount different than the NAV of our ownership interest in partners' capital as of December 31, 2012. During the year ended December 31, 2012, Indemnity made contributions totaling $0.2 million and received distributions totaling $0.3 million, and the Exchange made contributions totaling $0.7 million and received distributions totaling $4.7 million for these investments. As of December 31, 2012, the amount of unfunded commitments related to the investments was $1.5 million for Indemnity and $4.5 million for the Exchange.
Level 3 Assets – Quarterly Change:
		Erie Insurance Group
(in millions)		Beginning balance at June 30, 2012		Included in			Included			Purchases		Sales			Transfers			Ending balance at September 30, 2012
				earnings (1)			in other								in and (out) of
							comprehensive								Level 3 (2)
							income
Indemnity
Available-for-sale securities:
Corporate debt securities		$	1	$	0		$	0		$	0	$	0		$	0		$	1
Collateralized debt obligations		4		0			0			0		(1		)	0			3
Total fixed maturities		5		0			0			0		(1		)	0			4
Total available-for-sale securities		5		0			0			0		(1		)	0			4
Other investments (3)		18		0			0			0		0			0			18
Total Level 3 assets – Indemnity		$	23	$	0		$	0		$	0	$	(1	)	$	0		$	22
Exchange
Available-for-sale securities:
States & political subdivisions		$	4	$	0		$	0		$	0	$	0		$	0		$	4
Corporate debt securities		23		0			1			0		0			10			34
Collateralized debt obligations		27		0			0			0		(4		)	23			46
Other debt securities		5		0			0			0		0			0			5
Total fixed maturities		59		0			1			0		(4		)	33			89
Nonredeemable preferred stock		5		0			1			0		0			0			6
Total available-for-sale securities		64		0			2			0		(4		)	33			95
Trading securities:
Common stock		14		(1		)	0			0		0			0			13
Total trading securities		14		(1		)	0			0		0			0			13
Other investments (3)		107		3			0			0		(2		)	0			108
Total Level 3 assets – Exchange		$	185	$	2		$	2		$	0	$	(6	)	$	33		$	216
Total Level 3 assets – Erie Insurance Group		$	208	$	2		$	2		$	0	$	(7	)	$	33		$	238
-1	These amounts are reported in the Consolidated Statement of Operations. There is $(1) million included in net realized investment gains (losses) and $3 million included in equity in earnings of limited partnerships for the three months ended September 30, 2012 on Level 3 securities.
-2	Transfers in and out of Level 3 are attributable to changes in the availability of market observable information for individual securities within the respective categories. Transfers in and out of levels are recognized at the start of the period.
-3	The other investments reported as Level 3 assets represent real estate funds which were previously presented with our limited partnerships reported under the equity method of accounting and therefore were not included in our fair value measurements table. This table has been adjusted to reflect the appropriate fair value of these assets for the three months ended September 30, 2012.
We review the fair value hierarchy classifications each reporting period.  Transfers between hierarchy levels may occur due to changes in the available market observable inputs.  Transfers in and out of level classifications are reported as having occurred at the beginning of the quarter in which the transfers occurred.
For Indemnity, Level 1 to Level 2 transfers totaled $2 million and Level 2 to Level 1 transfers totaled $1 million due to trading activity levels related to one preferred stock holding and one preferred stock holding, respectively, for the three months ended September 30, 2012. There were no transfers between Level 2 and Level 3.
For the Exchange, Level 1 to Level 2 transfers totaled $42 million and Level 2 to Level 1 transfers totaled $35 million due to trading activity levels related to three preferred stock holdings and five preferred stock holdings, respectively, for the three months ended September 30, 2012. Transfers between Level 2 and Level 3 totaled $34 million and Level 3 to Level 2 transfers totaled $1 million related to four fixed maturity holdings and one fixed maturity holding, respectively. These transfers in and out of Level 3 were primarily the result of using unobservable and observable market data, respectively, to determine the fair value at September 30, 2012.
Level 3 Assets – Year-to-Date Change:
		Erie Insurance Group
(in millions)		Beginning balance at December 31, 2011		Included in			Included			Purchases		Sales			Transfers			Ending balance at September 30, 2012
				earnings (1)			in other								in and (out) of
							comprehensive								Level 3 (2)
							income
Indemnity
Corporate debt securities		$	0	$	0		$	0		$	0	$	0		$	1		$	1
Collateralized debt obligations		4		0			0			0		(1		)	0			3
Total fixed maturities		4		0			0			0		(1		)	1			4
Total available-for-sale securities		4		0			0			0		(1		)	1			4
Other investments (3)		17		1			0			0		0			0			18
Total Level 3 assets – Indemnity		$	21	$	1		$	0		$	0	$	(1	)	$	1		$	22
Exchange
Available-for-sale securities:
States & political subdivisions		$	4	$	0		$	0		$	0	$	0		$	0		$	4
Corporate debt securities		12		0			1			1		(5		)	25			34
Collateralized debt obligations		29		1			3			0		(7		)	20			46
Other debt securities		5		0			0			0		0			0			5
Total fixed maturities		50		1			4			1		(12		)	45			89
Nonredeemable preferred stock		5		0			1			0		0			0			6
Total available-for-sale securities		55		1			5			1		(12		)	45			95
Trading securities:
Common stock		12		2			0			0		(1		)	0			13
Total trading securities		12		2			0			0		(1		)	0			13
Other investments (3)		102		9			0			0		(3		)	0			108
Total Level 3 assets – Exchange		$	169	$	12		$	5		$	1	$	(16	)	$	45		$	216
Total Level 3 assets – Erie Insurance Group		$	190	$	13		$	5		$	1	$	(17	)	$	46		$	238
-1	These amounts are reported in the Consolidated Statement of Operations. There is $3 million included in net realized investment gains (losses) and $10 million included in equity in earnings of limited partnerships for the nine months ended September 30, 2012 on Level 3 securities.
-2	Transfers in and out of Level 3 are attributable to changes in the availability of market observable information for individual securities within the respective categories. Transfers in and out of levels are recognized at the start of the period.
-3	The other investments reported as Level 3 assets represent real estate funds which were previously presented with our limited partnerships reported under the equity method of accounting and therefore were not included in our fair value measurements table. This table has been adjusted to reflect the appropriate fair value of these assets for the nine months ended September 30, 2012.
For Indemnity, Level 1 to Level 2 transfers totaled $3 million and Level 2 to Level 1 transfers totaled $1 million due to trading activity levels related to two preferred stock holdings and one preferred stock holding, respectively, for the nine months ended September 30, 2012. Level 2 to Level 3 transfers totaled $1 million due to trading activity levels related to one fixed maturity holding, and there were no transfers from Level 3 to Level 2.
For the Exchange, Level 1 to Level 2 transfers totaled $56 million and Level 2 to Level 1 transfers totaled $53 million due to trading activity levels related to six preferred stock holdings and six preferred stock holdings, respectively, for the nine months ended September 30, 2012. Level 2 to Level 3 transfers totaled $46 million and Level 3 to Level 2 transfers totaled $1 million related to eight fixed maturity holdings and one fixed maturity holding, respectively. These transfers in and out of Level 3 were primarily the result of using non-binding and binding broker quotes, respectively, to determine the fair value at September 30, 2012.
The following table sets forth our consolidated fair value measurements on a recurring basis by pricing source at September 30, 2013:
		Erie Insurance Group
(in millions)		30-Sep-13
		Total		Level 1			Level 2			Level 3
Indemnity
Fixed maturities:
Priced via pricing services		$	497	$	0		$	497		$	0
Priced via market comparables/broker quotes (1)		1		0			0			1
Priced via internal modeling		1		0			0			1
Total fixed maturities		499		0			497			2
Nonredeemable preferred stock:
Priced via pricing services		21		2			19			0
Priced via market comparables/broker quotes (1)		2		0			2			0
Priced via internal modeling		0		0			0			0
Total nonredeemable preferred stock		23		2			21			0
Common stock:
Priced via pricing services		25		25			0			0
Priced via market comparables/broker quotes (1)		0		0			0			0
Priced via internal modeling		0		0			0			0
Total common stock		25		25			0			0
Other investments:
Priced via unobservable inputs (2)		19		0			0			19
Total other investments		19		0			0			19
Total – Indemnity		$	566	$	27		$	518		$	21
Exchange
Fixed maturities:
Priced via pricing services		$	7,836	$	0		$	7,836		$	0
Priced via market comparables/broker quotes (1)		71		0			50			21
Priced via internal modeling		14		0			0			14
Total fixed maturities		7,921		0			7,886			35
Nonredeemable preferred stock:
Priced via pricing services		597		230			367			0
Priced via market comparables/broker quotes (1)		14		0			14			0
Priced via internal modeling		0		0			0			0
Total nonredeemable preferred stock		611		230			381			0
Common stock:
Priced via pricing services		3,169		3,169			0			0
Priced via market comparables/broker quotes (1)		0		0			0			0
Priced via internal modeling		14		0			0			14
Total common stock		3,183		3,169			0			14
Other investments:
Priced via unobservable inputs (2)		100		0			0			100
Total other investments		100		0			0			100
Total – Exchange		$	11,815	$	3,399		$	8,267		$	149
Total – Erie Insurance Group		$	12,381	$	3,426		$	8,785		$	170
-1	When a non-binding broker quote was the only price available, the security was classified as Level 3.
-2	Other investments measured at fair value represent real estate funds included on the balance sheet as limited partnership investments that are reported under the fair value option. The fair value of these investments is based on the net asset value (NAV) information provided by the general partner.
There were no assets measured at fair value on a nonrecurring basis during the nine months ended September 30, 2013.

Investments

Investments	9 Months Ended
	Sep. 30, 2013
Investments [Abstract]	'
Investments	'
	Note 7.  Investments
	Available-for-sale securities
	The following table summarizes the cost and fair value of our available-for-sale securities at September 30, 2013:
			Erie Insurance Group
			30-Sep-13
	(in millions)		Amortized				Gross unrealized gains				Gross unrealized losses				Estimated fair value
			cost
	Indemnity
	Available-for-sale securities:
	States & political subdivisions		$	212			$	8			$	1			$	219
	Corporate debt securities		278				2				1				279
	Collateralized debt obligations		1				0				0				1
	Total fixed maturities		491				10				2				499
	Nonredeemable preferred stock		22				1				0				23
	Common stock		26				0				1				25
	Total available-for-sale securities – Indemnity		$	539			$	11			$	3			$	547
	Exchange
	Available-for-sale securities:
	U.S. government & agencies		$	173			$	2			$	2			$	173
	States & political subdivisions		1,383				60				12				1,431
	Foreign government securities		15				0				0				15
	Corporate debt securities		5,647				367				45				5,969
	Residential mortgage-backed securities		200				4				5				199
	Commercial mortgage-backed securities		46				2				0				48
	Collateralized debt obligations		13				7				0				20
	Other debt securities		64				3				1				66
	Total fixed maturities		7,541				445				65				7,921
	Nonredeemable preferred stock		568				53				10				611
	Common stock		241				0				3				238
	Total available-for-sale securities – Exchange		$	8,350			$	498			$	78			$	8,770
	Total available-for-sale securities – Erie Insurance Group		$	8,889			$	509			$	81			$	9,317
	The following table summarizes the cost and fair value of our available-for-sale securities at December 31, 2012:
			Erie Insurance Group
			31-Dec-12
	(in millions)		Amortized				Gross unrealized gains				Gross unrealized losses				Estimated fair value
			cost
	Indemnity
	Available-for-sale securities:
	States & political subdivisions		$	172			$	13			$	0			$	185
	Corporate debt securities		259				2				0				261
	Commercial mortgage-backed securities		3				0				0				3
	Collateralized debt obligations		3				0				0				3
	Total fixed maturities		437				15				0				452
	Nonredeemable preferred stock		28				2				1				29
	Common stock		26				0				0				26
	Total available-for-sale securities – Indemnity		$	491			$	17			$	1			$	507
	Exchange
	Available-for-sale securities:
	U.S. government & agencies		$	190			$	2			$	1			$	191
	States & political subdivisions		1,218				103				0				1,321
	Foreign government securities		15				1				0				16
	Corporate debt securities		5,211				569				3				5,777
	Residential mortgage-backed securities		226				6				1				231
	Commercial mortgage-backed securities		62				5				0				67
	Collateralized debt obligations		43				6				0				49
	Other debt securities		51				4				0				55
	Total fixed maturities		7,016				696				5				7,707
	Nonredeemable preferred stock		555				77				1				631
	Common stock		316				0				2				314
	Total available-for-sale securities – Exchange		$	7,887			$	773			$	8			$	8,652
	Total available-for-sale securities – Erie Insurance Group		$	8,378			$	790			$	9			$	9,159
	The amortized cost and estimated fair value of fixed maturities at September 30, 2013 are shown below by remaining contractual term to maturity.  Mortgage-backed securities are allocated based upon their stated maturity dates.  Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
			Erie Insurance Group
		30-Sep-13
(in millions)		Amortized				Estimated
		cost				fair value
Indemnity
Due in one year or less		$	106			$	106
Due after one year through five years		239				242
Due after five years through ten years		71				73
Due after ten years		75				78
Total fixed maturities – Indemnity		$	491			$	499
Exchange
Due in one year or less		476				484
Due after one year through five years		2,681				2,862
Due after five years through ten years		2,781				2,927
Due after ten years		1,603				1,648
Total fixed maturities – Exchange		$	7,541			$	7,921
Total fixed maturities – Erie Insurance Group		$	8,032			$	8,420
Available-for-sale securities in a gross unrealized loss position at September 30, 2013 are as follows.  Data is provided by length of time for securities in a gross unrealized loss position.
		Erie Insurance Group
		30-Sep-13
(dollars in millions)		Less than 12 months								12 months or longer							Total
Indemnity		Fair				Unrealized losses				Fair				Unrealized losses			Fair		Unrealized losses		No. of holdings
		value								value							value
Available-for-sale securities:
States & political subdivisions		$	23			$	1			$	0			$	0		$	23	$	1	10
Corporate debt securities		73				1				10				0			83		1		15
Total fixed maturities		96				2				10				0			106		2		25
Nonredeemable preferred stock		3				0				6				0			9		0		4
Common stock		25				1				0				0			25		1		2
Total available-for-sale securities – Indemnity		$	124			$	3			$	16			$	0		$	140	$	3	31
Quality breakdown of fixed maturities:
Investment grade		$	96			$	2			$	10			$	0		$	106	$	2	25
Non-investment grade		0				0				0				0			0		0		0
Total fixed maturities – Indemnity		$	96			$	2			$	10			$	0		$	106	$	2	25
Exchange
Available-for-sale securities:
U.S. government & agencies		$	104			$	2			$	0			$	0		$	104	$	2	7
States & political subdivisions		309				12				0				0			309		12		77
Foreign government securities		5				0				0				0			5		0		1
Corporate debt securities		1,116				44				6				1			1,122		45		199
Residential mortgage-backed securities		87				4				14				1			101		5		18
Other debt securities		32				1				0				0			32		1		6
Total fixed maturities		1,653				63				20				2			1,673		65		308
Nonredeemable preferred stock		165				9				15				1			180		10		24
Common stock		238				3				0				0			238		3		3
Total available-for-sale securities – Exchange		$	2,056			$	75			$	35			$	3		$	2,091	$	78	335
Quality breakdown of fixed maturities:
Investment grade		$	1,561			$	58			$	19			$	2		$	1,580	$	60	289
Non-investment grade		92				5				1				0			93		5		19
Total fixed maturities – Exchange		$	1,653			$	63			$	20			$	2		$	1,673	$	65	308
The above securities for Indemnity and the Exchange have been evaluated and determined to be temporary impairments for which we expect to recover our entire principal plus interest.  The primary components of this analysis include a general review of market conditions and financial performance of the issuer along with the extent and duration at which fair value is less than cost.  Any securities that we intend to sell or will more likely than not be required to sell before recovery are included in other-than-temporary impairments with the impairment charges recognized in earnings.
Available-for-sale securities in a gross unrealized loss position at December 31, 2012 are as follows.  Data is provided by length of time for securities in a gross unrealized loss position.
		Erie Insurance Group
		December 31, 2012
(dollars in millions)		Less than 12 months								12 months or longer							Total
Indemnity		Fair				Unrealized				Fair				Unrealized			Fair		Unrealized		No. of
		value				losses				value				losses			value		losses		holdings
Available-for-sale securities:
Corporate debt securities		$	59			$	0			$	0			$	0		$	59	$	0	12
Commercial mortgage-backed securities		0				0				3				0			3		0		1
Total fixed maturities		59				0				3				0			62		0		13
Nonredeemable preferred stock		7				0				3				1			10		1		4
Common stock		26				0				0				0			26		0		2
Total available-for-sale securities – Indemnity		$	92			$	0			$	6			$	1		$	98	$	1	19
Quality breakdown of fixed maturities:
Investment grade		$	55			$	0			$	3			$	0		$	58	$	0	12
Non-investment grade		4				0				0				0			4		0		1
Total fixed maturities – Indemnity		$	59			$	0			$	3			$	0		$	62	$	0	13
Exchange
Available-for-sale securities:
U.S. government & agencies		$	80			$	1			$	0			$	0		$	80	$	1	7
States & political subdivisions		23				0				0				0			23		0		11
Corporate debt securities		152				3				9				0			161		3		31
Residential mortgage-backed securities		56				1				0				0			56		1		9
Collateralized debt obligations		0				0				21				0			21		0		1
Other debt securities		5				0				0				0			5		0		2
Total fixed maturities		316				5				30				0			346		5		61
Nonredeemable preferred stock		64				0				18				1			82		1		13
Common stock		314				2				0				0			314		2		3
Total available-for-sale securities – Exchange		$	694			$	7			$	48			$	1		$	742	$	8	77
Quality breakdown of fixed maturities:
Investment grade		$	296			$	4			$	24			$	0		$	320	$	4	53
Non-investment grade		20				1				6				0			26		1		8
Total fixed maturities – Exchange		$	316			$	5			$	30			$	0		$	346	$	5	61
The above securities for Indemnity and the Exchange have been evaluated and determined to be temporary impairments for which we expect to recover our entire principal plus interest.  The primary components of this analysis include a general review of market conditions and financial performance of the issuer along with the extent and duration at which fair value is less than cost.  Any securities that we intend to sell or will more likely than not be required to sell before recovery are included in other-than-temporary impairments with the impairment charges recognized in earnings.
Net investment income
Interest and dividend income are recognized as earned and recorded to net investment income.  Investment income, net of expenses, was generated from the following portfolios:
		Erie Insurance Group
(in millions)		Three months ended September 30,								Nine months ended September 30,
		2013				2012				2013				2012
Indemnity
Fixed maturities		$	3			$	4			$	9			$	10
Equity securities		1				0				2				2
Cash equivalents and other		0				1				1				1
Total investment income		4				5				12				13
Less: investment expenses		0				1				1				1
Investment income, net of expenses – Indemnity		$	4			$	4			$	11			$	12
Exchange
Fixed maturities		$	83			$	87			$	249			$	266
Equity securities		29				23				80				72
Cash equivalents and other		1				0				1				2
Total investment income		113				110				330				340
Less: investment expenses		8				9				25				26
Investment income, net of expenses – Exchange		$	105			$	101			$	305			$	314
Investment income, net of expenses – Erie Insurance Group		$	109			$	105			$	316			$	326
Realized investment gains (losses)
Realized gains and losses on sales of securities are recognized in income based upon the specific identification method. Realized gains (losses) on investments were as follows:
		Erie Insurance Group
(in millions)		Three months ended September 30,								Nine months ended September 30,
		2013				2012				2013				2012
Indemnity
Available-for-sale securities:
Fixed maturities:
Gross realized gains		$	1			$	0			$	1			$	0
Gross realized losses		0				0				0				0
Net realized gains		1				0				1				0
Equity securities:
Gross realized gains		0				0				0				0
Gross realized losses		0				0				0				0
Net realized gains		0				0				0				0
Trading securities:
Common stock:
Gross realized gains		0				0				0				1
Gross realized losses		0				0				0				0
Increases in fair value(1)		0				2				0				3
Net realized gains		0				2				0				4
Net realized investment gains – Indemnity		$	1			$	2			$	1			$	4
Exchange
Available-for-sale securities:
Fixed maturities:
Gross realized gains		$	4			$	22			$	26			$	47
Gross realized losses		(20		)		(6		)		(25		)		(12		)
Net realized (losses) gains		(16		)		16				1				35
Equity securities:
Gross realized gains		0				5				4				10
Gross realized losses		(9		)		(5		)		(9		)		(7		)
Net realized (losses) gains		(9		)		0				(5		)		3
Trading securities:
Common stock:
Gross realized gains		90				37				246				122
Gross realized losses		(8		)		(24		)		(23		)		(57		)
Increases in fair value(1)		133				138				281				251
Net realized gains		215				151				504				316
Net realized investment gains – Exchange		$	190			$	167			$	500			$	354
Net realized investment gains – Erie Insurance Group		$	191			$	169			$	501			$	358
-1	The fair value on our common stock portfolio is based upon exchange traded prices provided by a nationally recognized pricing service.
Net impairment losses
The components of other-than-temporary impairments on investments are included below:
(in millions)		Erie Insurance Group
		Three months ended September 30,								Nine months ended September 30,
		2013				2012				2013				2012
Indemnity
Fixed maturities		$	0			$	0			$	0			$	0
Equity securities		0				0				0				0
Total other-than-temporary impairments		0				0				0				0
Portion recognized in other comprehensive income		0				0				0				0
Net impairment losses recognized in earnings – Indemnity		$	0			$	0			$	0			$	0
Exchange
Fixed maturities		$	1			$	0			$	2			$	0
Equity securities		8				0				8				0
Total other-than-temporary impairments		9				0				10				0
Portion recognized in other comprehensive income		0				0				0				0
Net impairment losses recognized in earnings – Exchange		$	9			$	0			$	10			$	0
Net impairment losses recognized in earnings – Erie Insurance Group		$	9			$	0			$	10			$	0
In considering if fixed maturity securities were credit-impaired, some of the factors considered include: potential for the default of interest and/or principal, level of subordination, collateral of the issue, compliance with financial covenants, credit ratings and industry conditions.  We have the intent to sell all credit-impaired fixed maturity securities, therefore the entire amount of the impairment charges were included in earnings and no non-credit impairments were recognized in other comprehensive income.
Limited partnerships
Limited partnership investments, excluding certain real estate limited partnerships recorded at fair value, are generally reported on a one-quarter lag, therefore our year-to-date limited partnership results through September 30, 2013 are comprised of partnership financial results for the fourth quarter of 2012 and first six months of 2013.  Given the lag in reporting, our limited partnership results do not reflect the market conditions of the third quarter of 2013.  Cash contributions made to and distributions received from the partnerships are recorded in the period in which the transaction occurs.
We have provided summarized financial information in the following table for the nine months ended September 30, 2013 and for the year ended December 31, 2012.  Amounts provided in the table are presented using the latest available financial statements received from the partnerships.  Limited partnership financial information has been presented based upon the investment percentage in the partnerships for the Erie Insurance Group consistent with how management evaluates the investments.
As these investments are generally reported on a one-quarter lag, our limited partnership results through September 30, 2013 include partnership financial results for the fourth quarter of 2012 and the first two quarters of 2013.
		Erie Insurance Group
		As of and for the nine months ended September 30, 2013
(dollars in millions)		Number of			Asset				Income (loss)				Income
		partnerships			recorded				recognized				(1oss)
Investment percentage in limited partnerships									due to valuation				recorded
									adjustments by
									the partnerships
Indemnity
Private equity:
Less than 10%		26			$	51			$	(7	)		$	7
Greater than or equal to 10% but less than 50%		3			14				2				0
Greater than 50%		0			0				0				0
Total private equity		29			65				(5		)		7
Mezzanine debt:
Less than 10%		11			15				0				1
Greater than or equal to 10% but less than 50%		3			7				0				2
Greater than 50%		1			0				0				0
Total mezzanine debt		15			22				0				3
Real estate:
Less than 10%		12			47				1				3
Greater than or equal to 10% but less than 50%		3			15				1				2
Greater than 50%		3			9				1				0
Total real estate		18			71				3				5
Total limited partnerships – Indemnity		62			$	158			$	(2	)		$	15
Exchange
Private equity:
Less than 10%		43			$	414			$	(29	)		$	65
Greater than or equal to 10% but less than 50%		3			63				11				(1		)
Greater than 50%		0			0				0				0
Total private equity		46			477				(18		)		64
Mezzanine debt:
Less than 10%		19			121				1				11
Greater than or equal to 10% but less than 50%		4			23				(1		)		5
Greater than 50%		3			34				1				2
Total mezzanine debt		26			178				1				18
Real estate:
Less than 10%		22			216				(5		)		24
Greater than or equal to 10% but less than 50%		6			76				2				7
Greater than 50%		3			32				(2		)		8
Total real estate		31			324				(5		)		39
Total limited partnerships – Exchange		103			$	979			$	(22	)		$	121
Total limited partnerships – Erie Insurance Group					$	1,137			$	(24	)		$	136
Per the limited partnership financial statements, total partnership assets were $49 billion and total partnership liabilities were $5 billion at September 30, 2013 (as recorded in the June 30, 2013 limited partnership financial statements).  For the nine months period comparable to that presented in the preceding table (fourth quarter of 2012 and first two quarters of 2013), total partnership valuation adjustment gains were $1 billion and total partnership net income was $5 billion.
As these investments are generally reported on a one-quarter lag, our limited partnership results through December 31, 2012 include partnership financial results for the fourth quarter of 2011 and the first three quarters of 2012.
		Erie Insurance Group
		As of and for the year ended December 31, 2012
(dollars in millions)		Number of			Asset				Income (loss)				Income
		partnerships			recorded				recognized				(1oss)
Investment percentage in limited partnerships									due to valuation				recorded
									adjustments by
									the partnerships
Indemnity
Private equity:
Less than 10%		26			$	60			$	(3	)		$	6
Greater than or equal to 10% but less than 50%		3			13				4				0
Greater than 50%		0			0				0				0
Total private equity		29			73				1				6
Mezzanine debt:
Less than 10%		11			18				(2		)		5
Greater than or equal to 10% but less than 50%		3			9				0				2
Greater than 50%		1			0				1				(1		)
Total mezzanine debt		15			27				(1		)		6
Real estate:
Less than 10%		12			55				4				(3		)
Greater than or equal to 10% but less than 50%		3			16				(1		)		1
Greater than 50%		3			9				2				0
Total real estate		18			80				5				(2		)
Total limited partnerships – Indemnity		62			$	180			$	5			$	10
Exchange
Private equity:
Less than 10%		42			$	424			$	22			$	24
Greater than or equal to 10% but less than 50%		3			58				16				(1		)
Greater than 50%		0			0				0				0
Total private equity		45			482				38				23
Mezzanine debt:
Less than 10%		18			132				(5		)		29
Greater than or equal to 10% but less than 50%		4			27				1				4
Greater than 50%		3			37				(2		)		5
Total mezzanine debt		25			196				(6		)		38
Real estate:
Less than 10%		22			274				(7		)		26
Greater than or equal to 10% but less than 50%		5			52				(4		)		3
Greater than 50%		3			33				6				(1		)
Total real estate		30			359				(5		)		28
Total limited partnerships – Exchange		100			$	1,037			$	27			$	89
Total limited partnerships – Erie Insurance Group					$	1,217			$	32			$	99
Per the limited partnership financial statements, total partnership assets were $53 billion and total partnership liabilities were $6 billion at December 31, 2012 (as recorded in the September 30, 2012 limited partnership financial statements).  For the twelve month period comparable to that presented in the preceding table (fourth quarter of 2011 and first three quarters of 2012), total partnership valuation adjustment gains were $2 billion and total partnership net income was $5 billion.
See also Note 14. “Commitments and Contingencies,” for investment commitments related to limited partnerships.

Bank_Line_of_Credit

Bank Line of Credit	9 Months Ended
	Sep. 30, 2013
Debt Disclosure [Abstract]	'
Bank Line of Credit	'
	Note 8.  Bank Line of Credit
	As of September 30, 2013, Indemnity has access to a $100 million bank revolving line of credit with a $25 million letter of credit sublimit that expires on November 3, 2016. As of September 30, 2013, a total of $98.2 million remains available under the facility due to $1.8 million outstanding letters of credit, which reduce the availability for letters of credit to $23.2 million.  There were no borrowings outstanding on the line of credit as of September 30, 2013.  Bonds with a fair value of $111 million were pledged as collateral on the line at September 30, 2013.
	As of September 30, 2013, the Exchange has access to a $300 million bank revolving line of credit with a $25 million letter of credit sublimit that expires on October 28, 2016. As of September 30, 2013, a total of $298.9 million remains available under the facility due to $1.1 million outstanding letters of credit, which reduce the availability for letters of credit to $23.9 million.  There were no borrowings outstanding on the line of credit as of September 30, 2013.  Bonds with a fair value of $332 million were pledged as collateral on the line at September 30, 2013.
	Both lines have securities pledged as collateral that have no trading restrictions and are reported as available-for-sale fixed maturities in the Consolidated Statements of Financial Position as of September 30, 2013.  The banks require compliance with certain covenants, which include minimum net worth and leverage ratios for Indemnity’s line of credit and statutory surplus and risk based capital ratios for the Exchange’s line of credit.  We are in compliance with all covenants at September 30, 2013.
	On October 25, 2013, Indemnity amended its revolving credit facility to extend the maturity date to November 3, 2018, lower the borrowing costs, and eliminate the minimum net worth financial covenant.
	On October 25, 2013, the Exchange entered into a second amended and restated credit agreement to extend the maturity date to October 25, 2018, lower the borrowing costs, and eliminate the minimum statutory surplus covenant.

Income_Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2013
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	Note 9.  Income Taxes
	Deferred tax assets and liabilities are recognized for the expected future tax consequences of events that have been included in the financial statements or tax returns.  Valuation allowances are established, when necessary, to reduce deferred tax assets to the amount expected to be realized.
	At September 30, 2013, we recorded a net deferred tax liability of $326 million on our Consolidated Statements of Financial Position.  Of this amount, $42 million is a net deferred tax asset attributable to Indemnity and $368 million is a net deferred tax liability attributable to the Exchange.  There was no deferred tax valuation allowance recorded at September 30, 2013.  Our effective tax rate is calculated after consideration of permanent differences related to our investment revenues.  Given that these amounts represent over 98% of the total permanent differences, the effective tax rate is approximately 35% for both Indemnity and the Exchange when the investment related permanent differences are excluded.

Postretirement_Benefits

Postretirement Benefits	9 Months Ended
	Sep. 30, 2013
Compensation and Retirement Disclosure [Abstract]	'
Postretirement Benefits	'
	Note 10.   Postretirement Benefits
	The liabilities for the postretirement plans described in this note are presented in total for all employees of the Erie Insurance Group.  The gross liability for postretirement benefits is presented in the Consolidated Statements of Financial Position as part of other liabilities.  A portion of annual expenses related to our postretirement benefit plans is allocated to related entities within the Erie Insurance Group.
	We offer a noncontributory defined benefit pension plan that covers substantially all employees.  This is the largest postretirement benefit plan we offer.  We also offer an unfunded supplemental employee retirement plan (“SERP”) for certain members of executive and senior management of the Erie Insurance Group. The cost of our pension plans are as follows:
		Erie Insurance Group
	(in millions)	Three months ended September 30,						Nine months ended September 30,
		2013			2012			2013			2012
	Service cost for benefits earned	$	7		$	5		$	20		$	16
	Interest cost on benefits obligation	6			6			19			18
	Expected return on plan assets	(8		)	(6		)	(23		)	(20		)
	Prior service cost amortization	0			1			1			1
	Net actuarial loss amortization	4			2			11			8
	Pension plan cost	$	9		$	8		$	28		$	23
	Prior to 2003, the employee pension plan purchased annuities from EFL for certain plan participants that were receiving benefit payments under the pension plan. These are nonparticipating annuity contracts under which EFL has unconditionally contracted to provide specified benefits to beneficiaries; however, the pension plan remains the primary obligor to the beneficiaries and a contingent liability, $27 million at September 30, 2013, exists in the event EFL does not honor the annuity contracts.

Indemnity_Capital_Stock

Indemnity Capital Stock	9 Months Ended
	Sep. 30, 2013
Class of Stock Disclosures [Abstract]	'
Indemnity Capital Stock	'
	Note 11.  Indemnity Capital Stock
	Class A and B common stock
	Holders of Class B shares may, at their option, convert their shares into Class A shares at the rate of 2,400 Class A shares per Class B share.  There were no share conversions during the nine months ended September 30, 2013. In both the first and fourth quarters of 2012, two shares of Class B common stock were converted into 4,800 shares of Class A common stock. There is no provision for conversion of Class A shares to Class B shares, and, Class B shares surrendered for conversion cannot be reissued.
	Stock repurchase program
	In October 2011, our Board of Directors approved a continuation of the current stock repurchase program for a total of $150 million, with no time limitation.  Indemnity had approximately $47 million of repurchase authority remaining under this program at September 30, 2013.

Indemnity_Accumulated_Other_Co

Indemnity Accumulated Other Comprehensive Income (Loss)	9 Months Ended
	Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]	'
Indemnity Accumulated Other Comprehensive Income (Loss)	'
	Note 12.  Indemnity Accumulated Other Comprehensive Loss
	Changes in Indemnity's accumulated other comprehensive loss by component attributable to the Indemnity shareholder interest is presented as follows for the nine months ended September 30, 2013:
			Indemnity Shareholder Interest
	(in millions)		Unrealized holding gains (losses) on available-for-sale securities			Postretirement plans(2)			Total
	Balance at December 31, 2012		$	13		$	(146	)	$	(133	)
	Other comprehensive loss before reclassifications, net of tax		(8		)	0			(8		)
	Amounts reclassified from accumulated other comprehensive loss, net of tax(1)		1			0			1
	Net current period other comprehensive loss, net of tax		(7		)	0			(7		)
	Balance at September 30, 2013		$	6		$	(146	)	$	(140	)
	-1	See the following table for details about these reclassifications.
	-2	There are no amounts reclassified out of accumulated other comprehensive loss related to postretirement plan items during interim periods.
	Amounts reclassified out of accumulated other comprehensive income (loss) and the related affected line item in the Consolidated Statements of Operations where net income is presented are as follows for the three and nine months ended September 30, 2013:
			Erie Insurance Group
			Three months ended			Nine months ended
			30-Sep-13			30-Sep-13
	(in millions)		Amounts reclassified from accumulated other comprehensive income (loss)(1)
	Unrealized holding gains (losses) on available-for-sale securities:
	Net realized investment losses		$	(24	)	$	(3	)
	Net impairment losses recognized in earnings		(9		)	(10		)
	Loss from operations before income taxes and noncontrolling interest		(33		)	(13		)
	Provision for income taxes		(12		)	(5		)
	Net loss		(21		)	(8		)
	Less: Net loss attributable to noncontrolling interest in consolidated entity – Exchange		(22		)	(9		)
	Net income attributable to Indemnity		$	1		$	1
	Amortization of postretirement plan items(2):
	Net income attributable to Indemnity		$	0		$	0
	Net income attributable to Indemnity		$	1		$	1
	-1	Positive amounts indicate net income, while negative amounts indicate net loss.
	-2	There are no amounts reclassified out of accumulated other comprehensive loss related to postretirement plan items during interim periods.

Indemnity_Shareholders_Equity_

Indemnity Shareholders' Equity and Noncontrolling Interest	9 Months Ended
	Sep. 30, 2013
Stockholders' Equity Note [Abstract]	'
Indemnity Shareholders' Equity and Noncontrolling Interest	'
	Note 13.  Indemnity Shareholders’ Equity and Noncontrolling Interest
	A reconciliation of the beginning and ending balances of Indemnity's shareholders’ equity and the noncontrolling interest is presented as follows for the year ended December 31, 2012 and for the nine months ended September 30, 2013:
		Erie Insurance Group
	(in millions, except per share data)	Indemnity			Exchange			Erie
		shareholder			noncontrolling			Insurance
		interest			interest			Group
	Balance at December 31, 2011	$	781		$	5,512		$	6,293
	Net income	160			459			619
	Change in other comprehensive (loss) income, net of tax	(28		)	178			150
	Net purchase of treasury stock	(69		)	—			(69		)
	Dividends declared:
	Class A $4.25 per share	(200		)	—			(200		)
	Class B $637.50 per share	(2		)	—			(2		)
	Balance at December 31, 2012	$	642		$	6,149		$	6,791
	Net income	127			607			734
	Change in other comprehensive loss, net of tax	(7		)	(214		)	(221		)
	Net purchase of treasury stock	(22		)	—			(22		)
	Dividends declared:
	Class A $1.7775 per share	(82		)	—			(82		)
	Class B $266.6250 per share	(1		)	—			(1		)
	Balance at September 30, 2013	$	657		$	6,542		$	7,199

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	Note 14.  Commitments and Contingencies
	Indemnity has contractual commitments to invest up to $30 million related to its limited partnership investments at September 30, 2013.  These commitments are split among private equity securities of $14 million, mezzanine debt securities of $10 million, and real estate activities of $6 million.  These commitments will be funded as required by the partnership agreements.
	The Exchange, including EFL, has contractual commitments to invest up to $388 million related to its limited partnership investments at September 30, 2013.  These commitments are split among private equity securities of $137 million, mezzanine debt securities of $164 million, and real estate activities of $87 million.  These commitments will be funded as required by the partnership agreements.
	We are involved in litigation arising in the ordinary course of conducting business.  In accordance with current accounting standards for loss contingencies and based upon information currently known to us, we establish reserves for litigation when it is probable that a loss associated with a claim or proceeding has been incurred and the amount of the loss or range of loss can be reasonably estimated.  When no amount within the range of loss is a better estimate than any other amount, we accrue the minimum amount of the estimable loss.  To the extent that such litigation against us may have an exposure to a loss in excess of the amount we have accrued, we believe that such excess would not be material to our consolidated financial condition, results of operations or cash flows.  Legal fees are expensed as incurred.  We believe that our accruals for legal proceedings are appropriate and, individually and in the aggregate, are not expected to be material to our consolidated financial condition, operations or cash flows.
	We review all litigation on an ongoing basis when making accrual and disclosure decisions.  For certain legal proceedings, we cannot reasonably estimate losses or a range of loss, if any, particularly for proceedings that are in their early stages of development or where the plaintiffs seek indeterminate damages.  Various factors, including, but not limited to, the outcome of potentially lengthy discovery and the resolution of important factual questions, may need to be determined before probability can be established or before a loss or range of loss can be reasonably estimated.  If the loss contingency in question is not both probable and reasonably estimable, we do not establish an accrual and the matter will continue to be monitored for any developments that would make the loss contingency both probable and reasonably estimable.  In the event that a legal proceeding results in a substantial judgment against, or settlement by, us, there can be no assurance that any resulting liability or financial commitment would not have a material adverse effect on the financial condition, results of operations or cash flows of the Indemnity shareholder interest or the consolidated financial statements of Erie Indemnity Company.
	We are subject to escheatment laws and regulations requiring the identification, reporting and payment to the state of unclaimed or abandoned funds of our policyholders, annuitants, claimants and shareholders. We are also subject to audit and examination for compliance with these requirements.
	In August 2012, we were notified that we would be subject to an audit of our compliance with the unclaimed property laws of a number of jurisdictions both within and outside our operating territory. The audit commenced in April 2013 and is ongoing. Additionally, EFL has been named in a lawsuit filed by the State Treasurer of West Virginia. The Complaint alleges that EFL has failed to comply with the West Virginia Uniform Unclaimed Property Act. EFL filed a motion to dismiss and a decision has not yet been rendered.
	It is probable that ongoing inquiries, audits, and other regulatory activity will result in the payment of additional death claims and escheatment of funds, as well as possible fines. EFL will incur expenses to identify death claims, confirm that benefits are due and notify the beneficiaries. At this time, we are not able to reasonably estimate the possible loss or range of loss related to this issue due to the early stage of development.

Indemnity_Supplemental_Informa

Indemnity Supplemental Information	9 Months Ended
	Sep. 30, 2013
Condensed Financial Information of Parent Company Only Disclosure [Abstract]	'
Indemnity Supplemental Information	'
	Note 15.  Indemnity Supplemental Information
	Consolidating Statement of Financial Position
		Erie Insurance Group
		At September 30, 2013
	(in millions)	Indemnity			Exchange			Reclassifications			Erie
		shareholder			noncontrolling			and			Insurance
		interest			interest			eliminations			Group
	Assets
	Investments
	Available-for-sale securities, at fair value:
	Fixed maturities	$	499		$	7,921		$	—		$	8,420
	Equity securities	48			849			—			897
	Trading securities, at fair value	0			2,945			—			2,945
	Limited partnerships	158			979			—			1,137
	Other invested assets	1			20			—			21
	Total investments	706			12,714			—			13,420
	Cash and cash equivalents	33			502			—			535
	Premiums receivable from policyholders	—			1,203			—			1,203
	Reinsurance recoverable	—			174			—			174
	Deferred income tax asset	42			0			—			42
	Deferred acquisition costs	—			574			—			574
	Other assets	107			329			—			436
	Receivables from the Exchange and other affiliates	320			—			(320		)	—
	Note receivable from EFL	25			—			(25		)	—
	Total assets	$	1,233		$	15,496		$	(345	)	$	16,384
	Liabilities
	Losses and loss expense reserves	$	—		$	3,712		$	—		$	3,712
	Life policy and deposit contract reserves	—			1,754			—			1,754
	Unearned premiums	—			2,654			—			2,654
	Deferred income tax liability	0			368			—			368
	Other liabilities	576			466			(345		)	697
	Total liabilities	576			8,954			(345		)	9,185
	Shareholders’ equity and noncontrolling interest
	Total Indemnity shareholders’ equity	657			—			—			657
	Noncontrolling interest in consolidated entity – Exchange	—			6,542			—			6,542
	Total equity	657			6,542			—			7,199
	Total liabilities, shareholders’ equity and noncontrolling interest	$	1,233		$	15,496		$	(345	)	$	16,384
	Consolidating Statement of Financial Position
		Erie Insurance Group
		At December 31, 2012
	(in millions)	Indemnity			Exchange			Reclassifications			Erie
		shareholder			noncontrolling			and			Insurance
		interest			interest			eliminations			Group
	Assets
	Investments
	Available-for-sale securities, at fair value:
	Fixed maturities	$	452		$	7,707		$	—		$	8,159
	Equity securities	55			945			—			1,000
	Trading securities, at fair value	0			2,417			—			2,417
	Limited partnerships	180			1,037			—			1,217
	Other invested assets	1			20			—			21
	Total investments	688			12,126			—			12,814
	Cash and cash equivalents	12			388			—			400
	Premiums receivable from policyholders	—			1,062			—			1,062
	Reinsurance recoverable	—			168			—			168
	Deferred income tax asset	37			0			—			37
	Deferred acquisition costs	—			504			—			504
	Other assets	117			339			—			456
	Receivables from the Exchange and other affiliates	281			—			(281		)	—
	Note receivable from EFL	25			—			(25		)	—
	Total assets	$	1,160		$	14,587		$	(306	)	$	15,441
	Liabilities
	Losses and loss expense reserves	$	—		$	3,598		$	—		$	3,598
Life policy and deposit contract reserves	—			1,708			—			1,708
Unearned premiums	—			2,365			—			2,365
Deferred income tax liability	0			365			—			365
Other liabilities	518			402			(306		)	614
Total liabilities	518			8,438			(306		)	8,650
Shareholders’ equity and noncontrolling interest
Total Indemnity shareholders’ equity	642			—			—			642
Noncontrolling interest in consolidated entity – Exchange	—			6,149			—			6,149
Total equity	642			6,149			—			6,791
Total liabilities, shareholders’ equity and noncontrolling interest	$	1,160		$	14,587		$	(306	)	$	15,441
Receivables from the Exchange and EFL and concentrations of credit risk – Financial instruments could potentially expose Indemnity to concentrations of credit risk, including unsecured receivables from the Exchange.  A majority of Indemnity’s revenue and receivables are from the Exchange and affiliates.  See also Note 4, “Variable Interest Entity.”
Management fees and expense allocation amounts due from the Exchange were $317 million and $278 million at September 30, 2013 and December 31, 2012, respectively.  The receivable from EFL for expense allocations and interest on the surplus note totaled $3 million at September 30, 2013 and December 31, 2012.
Note receivable from EFL – Indemnity is due $25 million from EFL in the form of a surplus note that was issued in 2003.  The note may be repaid only out of unassigned surplus of EFL.  Both principal and interest payments are subject to prior approval by the Pennsylvania Insurance Commissioner.  The note bears an annual interest rate of 6.7% and will be payable on demand on or after December 31, 2018, with interest scheduled to be paid semi-annually, subject to prior approval by the Pennsylvania Insurance Commissioner.  For the nine months ended September 30, 2013 and 2012, Indemnity recognized interest income on the note of $1.3 million.
Income attributable to Indemnity shareholder interest
	Indemnity Shareholder Interest
(in millions)	Three months ended September 30,						Nine months ended September 30,
	2013			2012			2013			2012
Management operations:
Management fee revenue, net	$	333		$	305		$	965		$	882
Service agreement revenue	8			8			23			23
Total revenue from management operations	341			313			988			905
Cost of management operations	281			247			820			734
Income from management operations before taxes	60			66			168			171
Investment operations:
Net investment income	4			4			11			12
Net realized gains on investments	1			2			1			4
Net impairment losses recognized in earnings	0			0			0			0
Equity in earnings of limited partnerships	5			6			13			10
Income from investment operations before taxes	10			12			25			26
Income from operations before income taxes	70			78			193			197
Provision for income taxes	24			27			66			67
Net income attributable to Indemnity	$	46		$	51		$	127		$	130
Indemnity’s components of direct cash flows as included in the Consolidated Statements of Cash Flows
	Indemnity Shareholder Interest
(in millions)	Nine months ended September 30,
	2013			2012
Management fee received	$	933		$	851
Service agreement fee received	23			23
Net investment income received	16			19
Limited partnership distributions	18			11
Decrease in reimbursements collected from affiliates	(8		)	(2		)
Commissions and bonuses paid to agents	(521		)	(470		)
Salaries and wages paid	(110		)	(99		)
Pension contribution and employee benefits paid	(33		)	(36		)
General operating expenses paid	(124		)	(99		)
Income taxes paid	(62		)	(54		)
Net cash provided by operating activities	132			144
Net cash used in investing activities	(33		)	(8		)
Net cash used in financing activities	(78		)	(135		)
Net increase in cash and cash equivalents	21			1
Cash and cash equivalents at beginning of period	12			11
Cash and cash equivalents at end of period	$	33		$	12

Subsequent_Events

Subsequent Events	9 Months Ended
	Sep. 30, 2013
Subsequent Events [Abstract]	'
Subsequent Events	'
	Note 16.  Subsequent Events
	Other than Indemnity and the Exchange amending their respective bank revolving lines of credit on October 25, 2013, as discussed in Note 8. "Bank Line of Credit," no items were identified in this period subsequent to the financial statement date that required adjustment or additional disclosure.

Significant_Accounting_Policie1

Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
Basis of presentation	'
	Basis of presentation
	The accompanying consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles (“GAAP”) and include the accounts of Indemnity together with its affiliate companies in which Indemnity holds a majority voting or economic interest.
Use of estimates	'
	Use of estimates
	The preparation of financial statements in conformity with GAAP requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period.  Actual results could differ from those estimates.
	In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation of our financial position, results of operations and cash flows for the interim periods have been included.  Operating results for the nine months ended September 30, 2013 are not necessarily indicative of the results that may be expected for the year ended December 31, 2013.  The accompanying consolidated financial statements and notes should be read in conjunction with the consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2012 as filed with the Securities and Exchange Commission on February 26, 2013.
Principles of consolidation	'
	Principles of consolidation
	We consolidate the Exchange as a variable interest entity for which Indemnity is the primary beneficiary.  All intercompany accounts and transactions have been eliminated in consolidation.  The required presentation of noncontrolling interests is reflected in the consolidated financial statements.  Noncontrolling interests represent the ownership interests of the Exchange, all of which are held by parties other than Indemnity (i.e. the Exchange’s subscribers (policyholders)).  Noncontrolling interests also include the Exchange subscribers’ ownership interest in EFL.
	Presentation of assets and liabilities – While the assets of the Exchange are presented separately in the Consolidated Statements of Financial Position, the Exchange’s assets can only be used to satisfy the Exchange’s liabilities or for other unrestricted activities.  Accounting Standards Codification (“ASC”) 810, Consolidation, does not require separate presentation of the Exchange’s assets; however, because the shareholders of Indemnity have no rights to the assets of the Exchange and, conversely, the Exchange has no rights to the assets of Indemnity, we have presented the invested assets of the Exchange separately on the Consolidated Statements of Financial Position along with the remaining consolidated assets reflecting the Exchange’s portion parenthetically.  Liabilities are required under ASC 810, Consolidation, to be presented separately for the Exchange on the Consolidated Statements of Financial Position as the Exchange’s creditors do not have recourse to the general credit of Indemnity.
	Rights of shareholders of Indemnity and subscribers (policyholders) of the Exchange – The shareholders of Indemnity, through the management fee, have a controlling financial interest in the Exchange; however, they have no other rights to or obligations arising from assets and liabilities of the Exchange.  The shareholders of Indemnity own its equity but have no rights or interest in the Exchange’s (noncontrolling interest) income or equity.  The noncontrolling interest equity represents the Exchange’s equity held for the interest of its subscribers (policyholders), who have no rights or interest in the Indemnity shareholder interest income or equity.
	All intercompany assets, liabilities, revenues and expenses between Indemnity and the Exchange have been eliminated in the Consolidated Financial Statements.
Adopted accounting pronouncements	'
	Adopted accounting pronouncements
	In February 2013, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2013-02, Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income.  The amendments in this ASU require an entity to present, either on the face of the statement where net income is presented or in the notes, significant amounts reclassified out of accumulated other comprehensive income by the line items affected by the reclassification. For amounts that are not required to be reclassified in their entirety to net income, an entity is required to cross-reference to other related disclosures for additional information. ASU 2013-02 is effective prospectively for interim and annual periods beginning after December 15, 2012.  We have elected to present amounts reclassified out of accumulated other comprehensive income by component and the respective line items of net income in the notes to our consolidated financial statements. See Note 12. "Indemnity's Accumulated Other Comprehensive Loss".
	Pending accounting pronouncements
	In February 2013, the FASB issued ASU 2013-04, Obligations Resulting from Joint and Several Liability Arrangements for Which the Total Amount of the Obligation Is Fixed at the Reporting Date. The amendments in this ASU provide guidance for the recognition, measurement, and disclosure of obligations resulting from joint and several liability arrangements for which the total amount of the obligation within the scope of this guidance is fixed at the reporting date, except for obligations addressed within existing guidance in GAAP. ASU 2013-04 is effective for interim and annual periods beginning after December 15, 2013, with early adoption permitted.  We do not expect the adoption of this new guidance to have a material impact on our consolidated financial statements.
Earnings per share	'
	Class A and Class B basic earnings per share and Class B diluted earnings per share are calculated under the two-class method. The two-class method allocates earnings to each class of stock based upon its dividend rights.  Class B shares are convertible into Class A shares at a conversion ratio of 2,400 to 1. See Note 11. “Indemnity Capital Stock”.
	Class A diluted earnings per share are calculated under the if-converted method, which reflects the conversion of Class B shares to Class A shares. Diluted earnings per share calculations include the effect of any potential common shares. Potential common shares include outstanding vested and not yet vested awards related to our outside directors’ stock compensation plan and any employee stock based awards.
Consolidation of variable interest entity	'
	Erie Insurance Exchange
	The Exchange is a reciprocal insurance exchange domiciled in Pennsylvania, for which Indemnity serves as attorney-in-fact.  Indemnity holds a variable interest in the Exchange due to the absence of decision-making capabilities by the equity owners (subscribers/policyholders) of the Exchange and due to the significance of the management fee the Exchange pays to Indemnity as its decision maker.  As a result, Indemnity is deemed to have a controlling financial interest in the Exchange and is considered to be its primary beneficiary.
	Consolidation of the Exchange’s financial results is required given the significance of the management fee to the Exchange and because Indemnity has the power to direct the activities of the Exchange that most significantly impact the Exchange’s economic performance.  The Exchange’s anticipated economic performance is the product of its underwriting results combined with its investment results.  The fees paid to Indemnity under the subscriber’s agreement impact the anticipated economic performance attributable to the Exchange’s results.  Indemnity earns a management fee from the Exchange for the services it provides as attorney-in-fact.  Indemnity’s management fee revenues are based on all premiums written or assumed by the Exchange.  Indemnity’s Board of Directors determines the management fee rate to be paid by the Exchange to Indemnity.  This rate cannot exceed 25% of the direct and assumed written premiums of the Exchange, as defined by the subscriber’s agreement signed by each policyholder.  Management fee revenues and management fee expenses are eliminated upon consolidation.
	The shareholders of Indemnity have no rights to the assets of the Exchange and no obligations arising from the liabilities of the Exchange.  Indemnity has no obligation related to any underwriting and/or investment losses experienced by the Exchange.  Indemnity would, however, be adversely impacted if the Exchange incurred significant underwriting and/or investment losses.  If the surplus of the Exchange were to decline significantly from its current level, its financial strength ratings could be reduced and, as a consequence, the Exchange could find it more difficult to retain its existing business and attract new business.  A decline in the business of the Exchange would have an adverse effect on the amount of the management fees Indemnity receives.  In addition, a decline in the surplus of the Exchange from its current level may impact the management fee rate received by Indemnity.  Indemnity also has an exposure to a concentration of credit risk related to the unsecured receivables due from the Exchange for its management fee. If any of these events occurred, Indemnity’s financial position, financial performance and/or cash flows could be adversely impacted.
	All property and casualty and life insurance operations are owned by the Exchange, and Indemnity functions solely as the management company.
	Indemnity has not provided financial or other support to the Exchange for any the reporting periods presented.  At September 30, 2013, there are no explicit or implicit arrangements that would require Indemnity to provide future financial support to the Exchange.  Indemnity is not liable if the Exchange was to be in violation of its debt covenants or was unable to meet its obligation for unfunded commitments to limited partnerships.
Fair value of financial instruments	'
	Our available-for-sale and trading securities are recorded at fair value, which is the price that would be received to sell the asset in an orderly transaction between willing market participants as of the measurement date.
	Valuation techniques used to derive the fair value of our available-for-sale and trading securities are based upon observable and unobservable inputs.  Observable inputs reflect market data obtained from independent sources.  Unobservable inputs reflect our own assumptions regarding fair market value for these securities.  Although the majority of our prices are obtained from third party sources, we also perform an internal pricing review for securities with low trading volumes under current market conditions. Financial instruments are categorized based upon the following characteristics or inputs to the valuation techniques:
	•	Level 1 – Quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity can access at the measurement date.
	•	Level 2 – Inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly.
	•	Level 3 – Unobservable inputs for the asset or liability.
	Estimates of fair values for our investment portfolio are obtained primarily from a nationally recognized pricing service.  Our Level 1 category includes those securities valued using an exchange traded price provided by the pricing service.  The methodologies used by the pricing service that support a Level 2 classification of a financial instrument include multiple verifiable, observable inputs including benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers and reference data.  Pricing service valuations for Level 3 securities are based upon proprietary models and are used when observable inputs are not available or in illiquid markets.
	In limited circumstances we adjust the price received from the pricing service when, in our judgment, a better reflection of fair value is available based upon corroborating information and our knowledge and monitoring of market conditions such as a disparity in price of comparable securities and/or non-binding broker quotes.  In other circumstances, certain securities are internally priced because prices are not provided by the pricing service.
	We perform continuous reviews of the prices obtained from the pricing service.  This includes evaluating the methodology and inputs used by the pricing service to ensure that we determine the proper classification level of the financial instrument.  Price variances, including large periodic changes, are investigated and corroborated by market data.  We have reviewed the pricing methodologies of our pricing service as well as other observable inputs, such as data, and transaction volumes and believe that their prices adequately consider market activity in determining fair value.  Our review process continues to evolve based upon accounting guidance and requirements.
	When a price from the pricing service is not available, values are determined by obtaining broker/dealer quotes and/or market comparables.  When available, we obtain multiple quotes for the same security.  The ultimate value for these securities is determined based upon our best estimate of fair value using corroborating market information.  Our evaluation includes the consideration of benchmark yields, reported trades, issuer spreads, two-sided markets, benchmark securities, bids, offers and reference data.
	For certain securities in an illiquid market, there may be no prices available from a pricing service and no comparable market quotes available.  In these situations, we value the security using an internally-developed, risk-adjusted discounted cash flow model.
Fair value of financial instruments, transfers between levels	'
	We review the fair value hierarchy classifications each reporting period.  Transfers between hierarchy levels may occur due to changes in the available market observable inputs.  Transfers in and out of level classifications are reported as having occurred at the beginning of the quarter in which the transfers occurred.
Investments - Limited partnerships	'
	Limited partnership investments, excluding certain real estate limited partnerships recorded at fair value, are generally reported on a one-quarter lag, therefore our year-to-date limited partnership results through September 30, 2013 are comprised of partnership financial results for the fourth quarter of 2012 and first six months of 2013.  Given the lag in reporting, our limited partnership results do not reflect the market conditions of the third quarter of 2013.  Cash contributions made to and distributions received from the partnerships are recorded in the period in which the transaction occurs.
Deferred taxes	'
	Deferred tax assets and liabilities are recognized for the expected future tax consequences of events that have been included in the financial statements or tax returns.  Valuation allowances are established, when necessary, to reduce deferred tax assets to the amount expected to be realized.
Commitments and contingencies	'
	We are involved in litigation arising in the ordinary course of conducting business.  In accordance with current accounting standards for loss contingencies and based upon information currently known to us, we establish reserves for litigation when it is probable that a loss associated with a claim or proceeding has been incurred and the amount of the loss or range of loss can be reasonably estimated.  When no amount within the range of loss is a better estimate than any other amount, we accrue the minimum amount of the estimable loss.  To the extent that such litigation against us may have an exposure to a loss in excess of the amount we have accrued, we believe that such excess would not be material to our consolidated financial condition, results of operations or cash flows.  Legal fees are expensed as incurred.  We believe that our accruals for legal proceedings are appropriate and, individually and in the aggregate, are not expected to be material to our consolidated financial condition, operations or cash flows.
	We review all litigation on an ongoing basis when making accrual and disclosure decisions.  For certain legal proceedings, we cannot reasonably estimate losses or a range of loss, if any, particularly for proceedings that are in their early stages of development or where the plaintiffs seek indeterminate damages.  Various factors, including, but not limited to, the outcome of potentially lengthy discovery and the resolution of important factual questions, may need to be determined before probability can be established or before a loss or range of loss can be reasonably estimated.  If the loss contingency in question is not both probable and reasonably estimable, we do not establish an accrual and the matter will continue to be monitored for any developments that would make the loss contingency both probable and reasonably estimable.  In the event that a legal proceeding results in a substantial judgment against, or settlement by, us, there can be no assurance that any resulting liability or financial commitment would not have a material adverse effect on the financial condition, results of operations or cash flows of the Indemnity shareholder interest or the consolidated financial statements of Erie Indemnity Company.

Indemnity_Earnings_Per_Share_T

Indemnity Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2013
Earnings Per Share [Abstract]	'
Schedule of reconciliation of the numerators and denominators used in the basic and diluted per-share computations	'
	A reconciliation of the numerators and denominators used in the basic and diluted per-share computations is presented as follows for each class of Indemnity common stock:
		Indemnity Shareholder Interest
	(dollars in millions, except per share data)	Three months ended September 30,
		2013					2012
		Allocated net income (numerator)		Weighted shares (denominator)	Per-share amount		Allocated net income (numerator)		Weighted shares (denominator)	Per- share amount
	Class A – Basic EPS:
	Income available to Class A stockholders	$	46	46,656,911	$	0.98	$	51	47,188,741	$	1.08
	Dilutive effect of stock-based awards	0		93,539	—		0		80,505	—
	Assumed conversion of Class B shares	0		6,100,800	—		0		6,105,600	—
	Class A – Diluted EPS:
	Income available to Class A stockholders on Class A equivalent shares	$	46	52,851,250	$	0.87	$	51	53,374,846	$	0.96
	Class B – Basic and diluted EPS:
	Income available to Class B stockholders	$	0	2,542	$	147	$	0	2,544	$	162
		Indemnity Shareholder Interest
	(dollars in millions, except per share data)	Nine months ended September 30,
		2013					2012
		Allocated net income (numerator)		Weighted shares (denominator)	Per-share amount		Allocated net income (numerator)		Weighted shares (denominator)	Per- share amount
	Class A – Basic EPS:
	Income available to Class A stockholders	$	126	46,707,971	$	2.71	$	129	47,476,693	$	2.73
	Dilutive effect of stock-based awards	0		93,539	—		0		80,505	—
	Assumed conversion of Class B shares	1		6,100,800	—		1		6,105,600	—
	Class A – Diluted EPS:
	Income available to Class A stockholders on Class A equivalent shares	$	127	52,902,310	$	2.41	$	130	53,662,798	$	2.43
	Class B – Basic and diluted EPS:
	Income available to Class B stockholders	$	1	2,542	$	406	$	1	2,544	$	411

Segment_Information_Tables

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2013
Segment Reporting [Abstract]	'
Schedule of components of the Consolidated Statements of Operations by reportable business segment	'
	The following tables summarize the components of the Consolidated Statements of Operations by reportable business segment:
		Erie Insurance Group
	(in millions)	Three months ended September 30, 2013
		Management		Property			Life			Investment			Eliminations			Consolidated
		operations		and casualty			insurance			operations
				insurance			operations
				operations
	Premiums earned/life policy revenue			$	1,221		$	21					$	(1	)	$	1,241
	Net investment income									$	111		(2		)	109
	Net realized investment gains									191						191
	Net impairment losses recognized in earnings									(9		)				(9		)
	Equity in earnings of limited partnerships									37						37
	Management fee revenue	$	333										(333		)	—
	Service agreement and other revenue	8					0									8
	Total revenues	341		1,221			21			330			(336		)	1,577
	Cost of management operations	281											(281		)	—
	Insurance losses and loss expenses			841			28						(1		)	868
	Policy acquisition and underwriting expenses			356			9						(54		)	311
	Total benefits and expenses	281		1,197			37			—			(336		)	1,179
	Income (loss) before income taxes	60		24			(16		)	330			—			398
	Provision for income taxes	21		8			(5		)	107			—			131
	Net income (loss)	$	39	$	16		$	(11	)	$	223		—			$	267
		Erie Insurance Group
	(in millions)	Three months ended September 30, 2012
		Management		Property			Life			Investment			Eliminations			Consolidated
		operations		and casualty			insurance			operations
				insurance			operations
				operations
	Premiums earned/life policy revenue			$	1,118		$	19					$	0		$	1,137
	Net investment income									$	108		(3		)	105
	Net realized investment gains									169						169
	Net impairment losses recognized in earnings									0						0
	Equity in earnings of limited partnerships									41						41
	Management fee revenue	$	305										(305		)	—
	Service agreement and other revenue	8					0									8
	Total revenues	313		1,118			19			318			(308		)	1,460
	Cost of management operations	247											(247		)	—
	Insurance losses and loss expenses			890			24						(2		)	912
	Policy acquisition and underwriting expense			329			8						(59		)	278
	Total benefits and expenses	247		1,219			32			—			(308		)	1,190
	Income (loss) before income taxes	66		(101		)	(13		)	318			—			270
	Provision for income taxes	23		(36		)	(4		)	103			—			86
	Net income (loss)	$	43	$	(65	)	$	(9	)	$	215		$	—		$	184
		Erie Insurance Group
	(in millions)	Nine months ended September 30, 2013
		Management		Property			Life			Investment			Eliminations			Consolidated
		operations		and casualty			insurance			operations
				insurance			operations
				operations
	Premiums earned/life policy revenue			$	3,573		$	60					$	(2	)	$	3,631
	Net investment income									$	324		(8		)	316
	Net realized investment gains									501						501
	Net impairment losses recognized in earnings									(10		)				(10		)
	Equity in earnings of limited partnerships									112						112
	Management fee revenue	$	965										(965		)	—
	Service agreement and other revenue	23					1									24
	Total revenues	988		3,573			61			927			(975		)	4,574
	Cost of management operations	820											(820		)	—
	Insurance losses and loss expenses			2,495			80						(4		)	2,571
	Policy acquisition and underwriting expenses			1,032			25						(151		)	906
	Total benefits and expenses	820		3,527			105			—			(975		)	3,477
	Income (loss) before income taxes	168		46			(44		)	927			—			1,097
	Provision for income taxes	59		16			(15		)	303			—			363
Net income (loss)	$	109	$	30		$	(29	)	$	624		$	—		$	734
	Erie Insurance Group
(in millions)	Nine months ended September 30, 2012
	Management operations		Property			Life insurance operations			Investment operations			Eliminations			Consolidated
			and casualty
			insurance
			operations
Premiums earned/life policy revenue			$	3,279		$	55					$	(1	)	$	3,333
Net investment income									$	334		(8		)	326
Net realized investment gains									358						358
Net impairment losses recognized in earnings									0						0
Equity in earnings of limited partnerships									99						99
Management fee revenue	$	882										(882		)	—
Service agreement and other revenue	23					1									24
Total revenues	905		3,279			56			791			(891		)	4,140
Cost of management operations	734											(734		)	—
Insurance losses and loss expenses			2,501			74						(4		)	2,571
Policy acquisition and underwriting expenses			963			25						(153		)	835
Total benefits and expenses	734		3,464			99			—			(891		)	3,406
Income (loss) before income taxes	171		(185		)	(43		)	791			—			734
Provision for income taxes	60		(65		)	(15		)	254			—			234
Net income (loss)	$	111	$	(120	)	$	(28	)	$	537		$	—		$	500

Fair_Value_Tables

Fair Value (Tables)	9 Months Ended
	Sep. 30, 2013
Fair Value Disclosures [Abstract]	'
Schedule of consolidated fair value measurements on a recurring basis by asset class and level of input	'
	The following table represents our consolidated fair value measurements on a recurring basis by asset class and level of input at September 30, 2013:
			Erie Insurance Group
			30-Sep-13
			Fair value measurements using:
	(in millions)		Total		Quoted prices in			Observable inputs			Unobservable inputs
					active markets for identical assets			Level 2			Level 3
					Level 1
	Indemnity
	Available-for-sale securities:
	States & political subdivisions		$	219	$	0		$	219		$	0
	Corporate debt securities		279		0			278			1
	Collateralized debt obligations		1		0			0			1
	Total fixed maturities		499		0			497			2
	Nonredeemable preferred stock		23		2			21			0
	Common stock		25		25			0			0
	Total available-for-sale securities		547		27			518			2
	Other investments (1)		19		0			0			19
	Total – Indemnity		$	566	$	27		$	518		$	21
	Exchange
	Available-for-sale securities:
	U.S. government & agencies		$	173	$	0		$	173		$	0
	States & political subdivisions		1,431		0			1,431			0
	Foreign government securities		15		0			15			0
	Corporate debt securities		5,969		0			5,943			26
	Residential mortgage-backed securities		199		0			199			0
	Commercial mortgage-backed securities		48		0			48			0
	Collateralized debt obligations		20		0			11			9
	Other debt securities		66		0			66			0
	Total fixed maturities		7,921		0			7,886			35
	Nonredeemable preferred stock		611		230			381			0
	Common stock		238		238			0			0
	Total available-for-sale securities		8,770		468			8,267			35
	Trading securities:
	Common stock		2,945		2,931			0			14
	Total trading securities		2,945		2,931			0			14
	Other investments (1)		100		0			0			100
	Total – Exchange		$	11,815	$	3,399		$	8,267		$	149
	Total – Erie Insurance Group		$	12,381	$	3,426		$	8,785		$	170
	(1)          Other investments measured at fair value represent four real estate funds included on the balance sheet as limited partnership investments that are reported under the fair value option. These investments can never be redeemed with the funds. Instead, distributions are received when liquidation of the underlying assets of the funds occur. It is estimated that the underlying assets will generally be liquidated between 5 and 10 years from the inception of the funds. The fair value of these investments is based on the net asset value (NAV) information provided by the general partner. Fair value is based on our proportionate share of the NAV based on the most recent partners' capital statements received from the general partners, which is generally one quarter prior to our balance sheet date. These values are then analyzed to determine if they represent the NAV at our balance sheet date, with adjustment being made where appropriate. We consider observable market data and perform a review validating the appropriateness of the NAV at each balance sheet date. It is likely that all of the investments will be redeemed at a future date for an amount different than the NAV of our ownership interest in partners' capital as of September 30, 2013. During the nine months ended September 30, 2013, Indemnity made no contributions and received distributions totaling $1.4 million, and the Exchange made no contributions and received distributions totaling $18.3 million for these investments. As of September 30, 2013, the amount of unfunded commitments related to the investments was $1.5 million for Indemnity and $4.5 million for the Exchange.
	The following table represents our consolidated fair value measurements on a recurring basis by asset class and level of input at December 31, 2012:
			Erie Insurance Group
			31-Dec-12
			Fair value measurements using:
	(in millions)		Total		Quoted prices in			Observable			Unobservable
					active markets for			inputs			inputs
					identical assets			Level 2			Level 3
					Level 1
	Indemnity
	Available-for-sale securities:
	States & political subdivisions		$	185	$	0		$	185		$	0
	Corporate debt securities		261		0			260			1
	Commercial mortgage-backed securities		3		0			3			0
	Collateralized debt obligations		3		0			0			3
	Total fixed maturities		452		0			448			4
	Nonredeemable preferred stock		29		4			25			0
	Common stock		26		26			0			0
	Total available-for-sale securities		507		30			473			4
	Other investments (1)		19		0			0			19
	Total – Indemnity		$	526	$	30		$	473		$	23
	Exchange
	Available-for-sale securities:
	U.S. government & agencies		$	191	$	0		$	191		$	0
	States & political subdivisions		1,321		0			1,321			0
Foreign government securities		16		0			16			0
Corporate debt securities		5,777		0			5,734			43
Residential mortgage-backed securities		231		0			231			0
Commercial mortgage-backed securities		67		0			67			0
Collateralized debt obligations		49		0			33			16
Other debt securities		55		0			55			0
Total fixed maturities		7,707		0			7,648			59
Nonredeemable preferred stock		631		199			432			0
Common stock		314		314			0			0
Total available-for-sale securities		8,652		513			8,080			59
Trading securities:
Common stock		2,417		2,402			0			15
Total trading securities		2,417		2,402			0			15
Other investments (1)		109		0			0			109
Total – Exchange		$	11,178	$	2,915		$	8,080		$	183
Total – Erie Insurance Group		$	11,704	$	2,945		$	8,553		$	206
(1)          Other investments measured at fair value represent four real estate funds included on the balance sheet as limited partnership investments that are reported under the fair value option. These investments can never be redeemed with the funds. Instead, distributions are received when liquidation of the underlying assets of the funds occur. It is estimated that the underlying assets will generally be liquidated between 5 and 10 years from the inception of the funds. The fair value of these investments is based on the net asset value (NAV) information provided by the general partner. Fair value is based on our proportionate share of the NAV based on the most recent partners' capital statements received from the general partners, which is generally one quarter prior to our balance sheet date. These values are then analyzed to determine if they represent the NAV at our balance sheet date, with adjustment being made where appropriate. We consider observable market data and perform a review validating the appropriateness of the NAV at each balance sheet date. It is likely that all of the investments will be redeemed at a future date for an amount different than the NAV of our ownership interest in partners' capital as of December 31, 2012. During the year ended December 31, 2012, Indemnity made contributions totaling $0.2 million and received distributions totaling $0.3 million, and the Exchange made contributions totaling $0.7 million and received distributions totaling $4.7 million for these investments. As of December 31, 2012, the amount of unfunded commitments related to the investments was $1.5 million for Indemnity and $4.5 million for the Exchange.
Schedule of roll forward of consolidated Level 3 fair value measurements on a recurring basis	'
	Level 3 Assets – Year-to-Date Change:
			Erie Insurance Group
	(in millions)		Beginning balance at December 31, 2012		Included in			Included			Purchases		Sales			Transfers			Ending balance at September 30, 2013
					earnings (1)			in other comprehensive								in and (out) of
								income								Level 3 (2)
	Indemnity
	Available-for-sale securities:
	Corporate debt securities		$	1	$	0		$	0		$	0	$	0		$	0		$	1
	Collateralized debt obligations		3		0			0			0		(2		)	0			1
	Total fixed maturities		4		0			0			0		(2		)	0			2
	Total available-for-sale securities		4		0			0			0		(2		)	0			2
	Other investments		19		1			0			0		(1		)	0			19
	Total Level 3 assets – Indemnity		$	23	$	1		$	0		$	0	$	(3	)	$	0		$	21
	Exchange
	Available-for-sale securities:
	Corporate debt securities		$	43	$	0		$	0		$	1	$	(3	)	$	(15	)	$	26
	Commercial mortgage-backed securities		0		0			0			0		(1		)	1			0
	Collateralized debt obligations		16		2			0			0		(10		)	1			9
	Total fixed maturities		59		2			0			1		(14		)	(13		)	35
	Nonredeemable preferred stock		0		2			(1		)	4		(10		)	5			0
	Total available-for-sale securities		59		4			(1		)	5		(24		)	(8		)	35
	Trading securities:
	Common stock		15		0			0			4		(5		)	0			14
	Total trading securities		15		0			0			4		(5		)	0			14
	Other investments		109		9			0			0		(18		)	0			100
	Total Level 3 assets – Exchange		$	183	$	13		$	(1	)	$	9	$	(47	)	$	(8	)	$	149
	Total Level 3 assets – Erie Insurance Group		$	206	$	14		$	(1	)	$	9	$	(50	)	$	(8	)	$	170
	-1	These amounts are reported in the Consolidated Statement of Operations. There is $4 million included in net realized investment gains (losses) and $10 million included in equity in earnings of limited partnerships for the nine months ended September 30, 2013 on Level 3 securities.
	-2	Transfers in and out of Level 3 are attributable to changes in the availability of market observable information for individual securities within the respective categories. Transfers in and out of levels are recognized at the start of the period.
	Level 3 Assets – Quarterly Change:
			Erie Insurance Group
	(in millions)		Beginning balance at June 30, 2012		Included in			Included			Purchases		Sales			Transfers			Ending balance at September 30, 2012
					earnings (1)			in other								in and (out) of
								comprehensive								Level 3 (2)
								income
	Indemnity
	Available-for-sale securities:
	Corporate debt securities		$	1	$	0		$	0		$	0	$	0		$	0		$	1
	Collateralized debt obligations		4		0			0			0		(1		)	0			3
	Total fixed maturities		5		0			0			0		(1		)	0			4
	Total available-for-sale securities		5		0			0			0		(1		)	0			4
	Other investments (3)		18		0			0			0		0			0			18
	Total Level 3 assets – Indemnity		$	23	$	0		$	0		$	0	$	(1	)	$	0		$	22
	Exchange
	Available-for-sale securities:
	States & political subdivisions		$	4	$	0		$	0		$	0	$	0		$	0		$	4
	Corporate debt securities		23		0			1			0		0			10			34
	Collateralized debt obligations		27		0			0			0		(4		)	23			46
	Other debt securities		5		0			0			0		0			0			5
	Total fixed maturities		59		0			1			0		(4		)	33			89
	Nonredeemable preferred stock		5		0			1			0		0			0			6
	Total available-for-sale securities		64		0			2			0		(4		)	33			95
	Trading securities:
	Common stock		14		(1		)	0			0		0			0			13
	Total trading securities		14		(1		)	0			0		0			0			13
	Other investments (3)		107		3			0			0		(2		)	0			108
	Total Level 3 assets – Exchange		$	185	$	2		$	2		$	0	$	(6	)	$	33		$	216
	Total Level 3 assets – Erie Insurance Group		$	208	$	2		$	2		$	0	$	(7	)	$	33		$	238
	-1	These amounts are reported in the Consolidated Statement of Operations. There is $(1) million included in net realized investment gains (losses) and $3 million included in equity in earnings of limited partnerships for the three months ended September 30, 2012 on Level 3 securities.
	-2	Transfers in and out of Level 3 are attributable to changes in the availability of market observable information for individual securities within the respective categories. Transfers in and out of levels are recognized at the start of the period.
	-3	The other investments reported as Level 3 assets represent real estate funds which were previously presented with our limited partnerships reported under the equity method of accounting and therefore were not included in our fair value measurements table. This table has been adjusted to reflect the appropriate fair value of these assets for the three months ended September 30, 2012.
	Level 3 Assets – Quarterly Change:
			Erie Insurance Group
(in millions)		Beginning balance at June 30, 2013		Included in			Included			Purchases		Sales			Transfers			Ending balance at September 30, 2013
				earnings (1)			in other comprehensive								in and (out) of
							income								Level 3 (2)
Indemnity
Available-for-sale securities:
Corporate debt securities		$	1	$	0		$	0		$	0	$	0		$	0		$	1
Collateralized debt obligations		1		0			0			0		0			0			1
Total fixed maturities		2		0			0			0		0			0			2
Total available-for-sale securities		2		0			0			0		0			0			2
Other investments		20		0			0			0		(1		)	0			19
Total Level 3 assets – Indemnity		$	22	$	0		$	0		$	0	$	(1	)	$	0		$	21
Exchange
Available-for-sale securities:
Corporate debt securities		$	33	$	0		$	0		$	0	$	0		$	(7	)	$	26
Commercial mortgage-backed securities		4		0			0			0		0			(4		)	0
Collateralized debt obligations		12		0			0			0		(3		)	0			9
Total fixed maturities		49		0			0			0		(3		)	(11		)	35
Nonredeemable preferred stock		7		0			(3		)	0		(4		)	0			0
Total available-for-sale securities		56		0			(3		)	0		(7		)	(11		)	35
Trading securities:
Common stock		7		3			0			4		0			0			14
Total trading securities		7		3			0			4		0			0			14
Other investments		113		3			0			0		(16		)	0			100
Total Level 3 assets – Exchange		$	176	$	6		$	(3	)	$	4	$	(23	)	$	(11	)	$	149
Total Level 3 assets – Erie Insurance Group		$	198	$	6		$	(3	)	$	4	$	(24	)	$	(11	)	$	170
-1	These amounts are reported in the Consolidated Statement of Operations. There is $3 million included in net realized investment gains (losses) and $3 million included in equity in earnings of limited partnerships for the three months ended September 30, 2013 on Level 3 securities.
-2	Transfers in and out of Level 3 are attributable to changes in the availability of market observable information for individual securities within the respective categories. Transfers in and out of levels are recognized at the start of the period.
Level 3 Assets – Year-to-Date Change:
		Erie Insurance Group
(in millions)		Beginning balance at December 31, 2011		Included in			Included			Purchases		Sales			Transfers			Ending balance at September 30, 2012
				earnings (1)			in other								in and (out) of
							comprehensive								Level 3 (2)
							income
Indemnity
Corporate debt securities		$	0	$	0		$	0		$	0	$	0		$	1		$	1
Collateralized debt obligations		4		0			0			0		(1		)	0			3
Total fixed maturities		4		0			0			0		(1		)	1			4
Total available-for-sale securities		4		0			0			0		(1		)	1			4
Other investments (3)		17		1			0			0		0			0			18
Total Level 3 assets – Indemnity		$	21	$	1		$	0		$	0	$	(1	)	$	1		$	22
Exchange
Available-for-sale securities:
States & political subdivisions		$	4	$	0		$	0		$	0	$	0		$	0		$	4
Corporate debt securities		12		0			1			1		(5		)	25			34
Collateralized debt obligations		29		1			3			0		(7		)	20			46
Other debt securities		5		0			0			0		0			0			5
Total fixed maturities		50		1			4			1		(12		)	45			89
Nonredeemable preferred stock		5		0			1			0		0			0			6
Total available-for-sale securities		55		1			5			1		(12		)	45			95
Trading securities:
Common stock		12		2			0			0		(1		)	0			13
Total trading securities		12		2			0			0		(1		)	0			13
Other investments (3)		102		9			0			0		(3		)	0			108
Total Level 3 assets – Exchange		$	169	$	12		$	5		$	1	$	(16	)	$	45		$	216
Total Level 3 assets – Erie Insurance Group		$	190	$	13		$	5		$	1	$	(17	)	$	46		$	238
-1	These amounts are reported in the Consolidated Statement of Operations. There is $3 million included in net realized investment gains (losses) and $10 million included in equity in earnings of limited partnerships for the nine months ended September 30, 2012 on Level 3 securities.
-2	Transfers in and out of Level 3 are attributable to changes in the availability of market observable information for individual securities within the respective categories. Transfers in and out of levels are recognized at the start of the period.
-3	The other investments reported as Level 3 assets represent real estate funds which were previously presented with our limited partnerships reported under the equity method of accounting and therefore were not included in our fair value measurements table. This table has been adjusted to reflect the appropriate fair value of these assets for the nine months ended September 30, 2012.
Schedule of Quantitative and Qualitative Disclosures about Unobservable Inputs	'
	Quantitative and Qualitative Disclosures about Unobservable Inputs
			Erie Insurance Group
			30-Sep-13
	(dollars in millions)		Fair		No. of		Valuation techniques	Unobservable input		Range	Weighted
			value		holdings						average
	Indemnity
	Corporate debt securities		$	1	1		Market approach	Non-binding broker quote		112.32
	Collateralized debt obligations		1		2		Income approach	Projected maturity date		Mar 2014 - Jul 2015
								Repayment at maturity		35 - 100%	70.00%
								Discount rate		7.5 - 15.0%	11.00%
	Other investments		$	19	2		See (1) below
	Total Level 3 assets – Indemnity		$	21	5
	Exchange
	Corporate debt securities		26		7		Market approach	Non-binding broker quote		107.40 - 115.50	110
								Comparable transaction EBITDA multiples		6.7 - 17.1x	8.0x
								Comparable security yield		6.00%
	Collateralized debt obligations		6		4		Income approach	Projected maturity date		Mar 2014 - Oct 2035
								Repayment at maturity		35 - 100%	90.00%
								Discount rate		7.0 - 18.0%	9.00%
								Projected LIBOR rate		0.26%
			3		3		Market approach	Non-binding broker quote		21.00 - 64.00	51
	Common stock		14		4		Market approach	Comparable transaction EBITDA multiples		6.7 - 17.1x	8.0x
								Discount for lack of marketability		5 - 30%	30%
	Other investments		100		4		See (1) below
	Total Level 3 assets – Exchange		$	149	22
	Total Level 3 assets – Erie Insurance Group		$	170	27
	-1	Other investments representing certain limited partnerships are recorded at fair value and are based upon net asset value (NAV) provided by the general partner where the unobservable inputs are not reasonably available to us.
Schedule of consolidated fair value measurements on a recurring basis by pricing source	'
	The following table sets forth our consolidated fair value measurements on a recurring basis by pricing source at September 30, 2013:
			Erie Insurance Group
	(in millions)		30-Sep-13
			Total		Level 1			Level 2			Level 3
	Indemnity
	Fixed maturities:
	Priced via pricing services		$	497	$	0		$	497		$	0
	Priced via market comparables/broker quotes (1)		1		0			0			1
	Priced via internal modeling		1		0			0			1
	Total fixed maturities		499		0			497			2
	Nonredeemable preferred stock:
	Priced via pricing services		21		2			19			0
	Priced via market comparables/broker quotes (1)		2		0			2			0
	Priced via internal modeling		0		0			0			0
	Total nonredeemable preferred stock		23		2			21			0
	Common stock:
	Priced via pricing services		25		25			0			0
	Priced via market comparables/broker quotes (1)		0		0			0			0
	Priced via internal modeling		0		0			0			0
	Total common stock		25		25			0			0
	Other investments:
	Priced via unobservable inputs (2)		19		0			0			19
	Total other investments		19		0			0			19
	Total – Indemnity		$	566	$	27		$	518		$	21
	Exchange
	Fixed maturities:
	Priced via pricing services		$	7,836	$	0		$	7,836		$	0
	Priced via market comparables/broker quotes (1)		71		0			50			21
	Priced via internal modeling		14		0			0			14
	Total fixed maturities		7,921		0			7,886			35
	Nonredeemable preferred stock:
	Priced via pricing services		597		230			367			0
	Priced via market comparables/broker quotes (1)		14		0			14			0
	Priced via internal modeling		0		0			0			0
	Total nonredeemable preferred stock		611		230			381			0
	Common stock:
	Priced via pricing services		3,169		3,169			0			0
	Priced via market comparables/broker quotes (1)		0		0			0			0
	Priced via internal modeling		14		0			0			14
	Total common stock		3,183		3,169			0			14
	Other investments:
	Priced via unobservable inputs (2)		100		0			0			100
	Total other investments		100		0			0			100
	Total – Exchange		$	11,815	$	3,399		$	8,267		$	149
	Total – Erie Insurance Group		$	12,381	$	3,426		$	8,785		$	170
	-1	When a non-binding broker quote was the only price available, the security was classified as Level 3.
	-2	Other investments measured at fair value represent real estate funds included on the balance sheet as limited partnership investments that are reported under the fair value option. The fair value of these investments is based on the net asset value (NAV) information provided by the general partner.

Investments_Tables

Investments (Tables)	9 Months Ended
	Sep. 30, 2013
Investments [Abstract]	'
Schedule of reconciliation of cost to fair value of available-for-sale securities	'
	The following table summarizes the cost and fair value of our available-for-sale securities at September 30, 2013:
			Erie Insurance Group
			30-Sep-13
	(in millions)		Amortized				Gross unrealized gains				Gross unrealized losses				Estimated fair value
			cost
	Indemnity
	Available-for-sale securities:
	States & political subdivisions		$	212			$	8			$	1			$	219
	Corporate debt securities		278				2				1				279
	Collateralized debt obligations		1				0				0				1
	Total fixed maturities		491				10				2				499
	Nonredeemable preferred stock		22				1				0				23
	Common stock		26				0				1				25
	Total available-for-sale securities – Indemnity		$	539			$	11			$	3			$	547
	Exchange
	Available-for-sale securities:
	U.S. government & agencies		$	173			$	2			$	2			$	173
	States & political subdivisions		1,383				60				12				1,431
	Foreign government securities		15				0				0				15
	Corporate debt securities		5,647				367				45				5,969
	Residential mortgage-backed securities		200				4				5				199
	Commercial mortgage-backed securities		46				2				0				48
	Collateralized debt obligations		13				7				0				20
	Other debt securities		64				3				1				66
	Total fixed maturities		7,541				445				65				7,921
	Nonredeemable preferred stock		568				53				10				611
	Common stock		241				0				3				238
	Total available-for-sale securities – Exchange		$	8,350			$	498			$	78			$	8,770
	Total available-for-sale securities – Erie Insurance Group		$	8,889			$	509			$	81			$	9,317
	The following table summarizes the cost and fair value of our available-for-sale securities at December 31, 2012:
			Erie Insurance Group
			31-Dec-12
	(in millions)		Amortized				Gross unrealized gains				Gross unrealized losses				Estimated fair value
			cost
	Indemnity
	Available-for-sale securities:
	States & political subdivisions		$	172			$	13			$	0			$	185
	Corporate debt securities		259				2				0				261
	Commercial mortgage-backed securities		3				0				0				3
	Collateralized debt obligations		3				0				0				3
	Total fixed maturities		437				15				0				452
	Nonredeemable preferred stock		28				2				1				29
	Common stock		26				0				0				26
	Total available-for-sale securities – Indemnity		$	491			$	17			$	1			$	507
	Exchange
	Available-for-sale securities:
	U.S. government & agencies		$	190			$	2			$	1			$	191
	States & political subdivisions		1,218				103				0				1,321
	Foreign government securities		15				1				0				16
	Corporate debt securities		5,211				569				3				5,777
	Residential mortgage-backed securities		226				6				1				231
	Commercial mortgage-backed securities		62				5				0				67
	Collateralized debt obligations		43				6				0				49
	Other debt securities		51				4				0				55
	Total fixed maturities		7,016				696				5				7,707
	Nonredeemable preferred stock		555				77				1				631
	Common stock		316				0				2				314
	Total available-for-sale securities – Exchange		$	7,887			$	773			$	8			$	8,652
	Total available-for-sale securities – Erie Insurance Group		$	8,378			$	790			$	9			$	9,159
Schedule of amortized cost and estimated fair value of fixed maturities by remaining contractual term to maturity	'
	The amortized cost and estimated fair value of fixed maturities at September 30, 2013 are shown below by remaining contractual term to maturity.  Mortgage-backed securities are allocated based upon their stated maturity dates.  Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
			Erie Insurance Group
			30-Sep-13
	(in millions)		Amortized				Estimated
			cost				fair value
	Indemnity
	Due in one year or less		$	106			$	106
	Due after one year through five years		239				242
	Due after five years through ten years		71				73
	Due after ten years		75				78
	Total fixed maturities – Indemnity		$	491			$	499
	Exchange
	Due in one year or less		476				484
	Due after one year through five years		2,681				2,862
	Due after five years through ten years		2,781				2,927
	Due after ten years		1,603				1,648
	Total fixed maturities – Exchange		$	7,541			$	7,921
	Total fixed maturities – Erie Insurance Group		$	8,032			$	8,420
Schedule of available-for-sale securities in a gross unrealized loss position by length of time for securities in a gross unrealized loss position	'
	Available-for-sale securities in a gross unrealized loss position at December 31, 2012 are as follows.  Data is provided by length of time for securities in a gross unrealized loss position.
			Erie Insurance Group
			December 31, 2012
	(dollars in millions)		Less than 12 months								12 months or longer							Total
	Indemnity		Fair				Unrealized				Fair				Unrealized			Fair		Unrealized		No. of
			value				losses				value				losses			value		losses		holdings
	Available-for-sale securities:
	Corporate debt securities		$	59			$	0			$	0			$	0		$	59	$	0	12
	Commercial mortgage-backed securities		0				0				3				0			3		0		1
	Total fixed maturities		59				0				3				0			62		0		13
	Nonredeemable preferred stock		7				0				3				1			10		1		4
	Common stock		26				0				0				0			26		0		2
	Total available-for-sale securities – Indemnity		$	92			$	0			$	6			$	1		$	98	$	1	19
	Quality breakdown of fixed maturities:
	Investment grade		$	55			$	0			$	3			$	0		$	58	$	0	12
	Non-investment grade		4				0				0				0			4		0		1
	Total fixed maturities – Indemnity		$	59			$	0			$	3			$	0		$	62	$	0	13
	Exchange
	Available-for-sale securities:
	U.S. government & agencies		$	80			$	1			$	0			$	0		$	80	$	1	7
	States & political subdivisions		23				0				0				0			23		0		11
	Corporate debt securities		152				3				9				0			161		3		31
	Residential mortgage-backed securities		56				1				0				0			56		1		9
	Collateralized debt obligations		0				0				21				0			21		0		1
	Other debt securities		5				0				0				0			5		0		2
	Total fixed maturities		316				5				30				0			346		5		61
	Nonredeemable preferred stock		64				0				18				1			82		1		13
	Common stock		314				2				0				0			314		2		3
	Total available-for-sale securities – Exchange		$	694			$	7			$	48			$	1		$	742	$	8	77
	Quality breakdown of fixed maturities:
	Investment grade		$	296			$	4			$	24			$	0		$	320	$	4	53
	Non-investment grade		20				1				6				0			26		1		8
	Total fixed maturities – Exchange		$	316			$	5			$	30			$	0		$	346	$	5	61
	Available-for-sale securities in a gross unrealized loss position at September 30, 2013 are as follows.  Data is provided by length of time for securities in a gross unrealized loss position.
			Erie Insurance Group
			30-Sep-13
	(dollars in millions)		Less than 12 months								12 months or longer							Total
	Indemnity		Fair				Unrealized losses				Fair				Unrealized losses			Fair		Unrealized losses		No. of holdings
			value								value							value
	Available-for-sale securities:
	States & political subdivisions		$	23			$	1			$	0			$	0		$	23	$	1	10
	Corporate debt securities		73				1				10				0			83		1		15
	Total fixed maturities		96				2				10				0			106		2		25
	Nonredeemable preferred stock		3				0				6				0			9		0		4
	Common stock		25				1				0				0			25		1		2
	Total available-for-sale securities – Indemnity		$	124			$	3			$	16			$	0		$	140	$	3	31
	Quality breakdown of fixed maturities:
	Investment grade		$	96			$	2			$	10			$	0		$	106	$	2	25
	Non-investment grade		0				0				0				0			0		0		0
	Total fixed maturities – Indemnity		$	96			$	2			$	10			$	0		$	106	$	2	25
	Exchange
	Available-for-sale securities:
	U.S. government & agencies		$	104			$	2			$	0			$	0		$	104	$	2	7
	States & political subdivisions		309				12				0				0			309		12		77
	Foreign government securities		5				0				0				0			5		0		1
	Corporate debt securities		1,116				44				6				1			1,122		45		199
	Residential mortgage-backed securities		87				4				14				1			101		5		18
	Other debt securities		32				1				0				0			32		1		6
	Total fixed maturities		1,653				63				20				2			1,673		65		308
	Nonredeemable preferred stock		165				9				15				1			180		10		24
	Common stock		238				3				0				0			238		3		3
	Total available-for-sale securities – Exchange		$	2,056			$	75			$	35			$	3		$	2,091	$	78	335
	Quality breakdown of fixed maturities:
Investment grade		$	1,561			$	58			$	19			$	2		$	1,580	$	60	289
Non-investment grade		92				5				1				0			93		5		19
Total fixed maturities – Exchange		$	1,653			$	63			$	20			$	2		$	1,673	$	65	308
Schedule of investment income, net of expenses, from portfolios	'
	Interest and dividend income are recognized as earned and recorded to net investment income.  Investment income, net of expenses, was generated from the following portfolios:
			Erie Insurance Group
	(in millions)		Three months ended September 30,								Nine months ended September 30,
			2013				2012				2013				2012
	Indemnity
	Fixed maturities		$	3			$	4			$	9			$	10
	Equity securities		1				0				2				2
	Cash equivalents and other		0				1				1				1
	Total investment income		4				5				12				13
	Less: investment expenses		0				1				1				1
	Investment income, net of expenses – Indemnity		$	4			$	4			$	11			$	12
	Exchange
	Fixed maturities		$	83			$	87			$	249			$	266
	Equity securities		29				23				80				72
	Cash equivalents and other		1				0				1				2
	Total investment income		113				110				330				340
	Less: investment expenses		8				9				25				26
	Investment income, net of expenses – Exchange		$	105			$	101			$	305			$	314
	Investment income, net of expenses – Erie Insurance Group		$	109			$	105			$	316			$	326
Schedule of realized gains (losses) on investments	'
	Realized gains and losses on sales of securities are recognized in income based upon the specific identification method. Realized gains (losses) on investments were as follows:
			Erie Insurance Group
	(in millions)		Three months ended September 30,								Nine months ended September 30,
			2013				2012				2013				2012
	Indemnity
	Available-for-sale securities:
	Fixed maturities:
	Gross realized gains		$	1			$	0			$	1			$	0
	Gross realized losses		0				0				0				0
	Net realized gains		1				0				1				0
	Equity securities:
	Gross realized gains		0				0				0				0
	Gross realized losses		0				0				0				0
	Net realized gains		0				0				0				0
	Trading securities:
	Common stock:
	Gross realized gains		0				0				0				1
	Gross realized losses		0				0				0				0
	Increases in fair value(1)		0				2				0				3
	Net realized gains		0				2				0				4
	Net realized investment gains – Indemnity		$	1			$	2			$	1			$	4
	Exchange
	Available-for-sale securities:
	Fixed maturities:
	Gross realized gains		$	4			$	22			$	26			$	47
	Gross realized losses		(20		)		(6		)		(25		)		(12		)
	Net realized (losses) gains		(16		)		16				1				35
	Equity securities:
	Gross realized gains		0				5				4				10
	Gross realized losses		(9		)		(5		)		(9		)		(7		)
	Net realized (losses) gains		(9		)		0				(5		)		3
	Trading securities:
	Common stock:
	Gross realized gains		90				37				246				122
	Gross realized losses		(8		)		(24		)		(23		)		(57		)
	Increases in fair value(1)		133				138				281				251
	Net realized gains		215				151				504				316
	Net realized investment gains – Exchange		$	190			$	167			$	500			$	354
	Net realized investment gains – Erie Insurance Group		$	191			$	169			$	501			$	358
	-1	The fair value on our common stock portfolio is based upon exchange traded prices provided by a nationally recognized pricing service.
Schedule of components of other-than-temporary impairments on investments	'
	The components of other-than-temporary impairments on investments are included below:
	(in millions)		Erie Insurance Group
			Three months ended September 30,								Nine months ended September 30,
			2013				2012				2013				2012
	Indemnity
	Fixed maturities		$	0			$	0			$	0			$	0
	Equity securities		0				0				0				0
	Total other-than-temporary impairments		0				0				0				0
	Portion recognized in other comprehensive income		0				0				0				0
	Net impairment losses recognized in earnings – Indemnity		$	0			$	0			$	0			$	0
	Exchange
	Fixed maturities		$	1			$	0			$	2			$	0
	Equity securities		8				0				8				0
	Total other-than-temporary impairments		9				0				10				0
	Portion recognized in other comprehensive income		0				0				0				0
	Net impairment losses recognized in earnings – Exchange		$	9			$	0			$	10			$	0
	Net impairment losses recognized in earnings – Erie Insurance Group		$	9			$	0			$	10			$	0
Schedule of limited partnership results, generally reported on a one-quarter lag	'
	As these investments are generally reported on a one-quarter lag, our limited partnership results through September 30, 2013 include partnership financial results for the fourth quarter of 2012 and the first two quarters of 2013.
			Erie Insurance Group
			As of and for the nine months ended September 30, 2013
	(dollars in millions)		Number of			Asset				Income (loss)				Income
			partnerships			recorded				recognized				(1oss)
	Investment percentage in limited partnerships									due to valuation				recorded
										adjustments by
										the partnerships
	Indemnity
	Private equity:
	Less than 10%		26			$	51			$	(7	)		$	7
	Greater than or equal to 10% but less than 50%		3			14				2				0
	Greater than 50%		0			0				0				0
	Total private equity		29			65				(5		)		7
	Mezzanine debt:
	Less than 10%		11			15				0				1
	Greater than or equal to 10% but less than 50%		3			7				0				2
	Greater than 50%		1			0				0				0
	Total mezzanine debt		15			22				0				3
	Real estate:
	Less than 10%		12			47				1				3
	Greater than or equal to 10% but less than 50%		3			15				1				2
	Greater than 50%		3			9				1				0
	Total real estate		18			71				3				5
	Total limited partnerships – Indemnity		62			$	158			$	(2	)		$	15
	Exchange
	Private equity:
	Less than 10%		43			$	414			$	(29	)		$	65
	Greater than or equal to 10% but less than 50%		3			63				11				(1		)
	Greater than 50%		0			0				0				0
	Total private equity		46			477				(18		)		64
	Mezzanine debt:
	Less than 10%		19			121				1				11
	Greater than or equal to 10% but less than 50%		4			23				(1		)		5
	Greater than 50%		3			34				1				2
	Total mezzanine debt		26			178				1				18
	Real estate:
	Less than 10%		22			216				(5		)		24
	Greater than or equal to 10% but less than 50%		6			76				2				7
	Greater than 50%		3			32				(2		)		8
	Total real estate		31			324				(5		)		39
	Total limited partnerships – Exchange		103			$	979			$	(22	)		$	121
	Total limited partnerships – Erie Insurance Group					$	1,137			$	(24	)		$	136
	As these investments are generally reported on a one-quarter lag, our limited partnership results through December 31, 2012 include partnership financial results for the fourth quarter of 2011 and the first three quarters of 2012.
			Erie Insurance Group
			As of and for the year ended December 31, 2012
	(dollars in millions)		Number of			Asset				Income (loss)				Income
			partnerships			recorded				recognized				(1oss)
	Investment percentage in limited partnerships									due to valuation				recorded
										adjustments by
										the partnerships
	Indemnity
	Private equity:
	Less than 10%		26			$	60			$	(3	)		$	6
	Greater than or equal to 10% but less than 50%		3			13				4				0
	Greater than 50%		0			0				0				0
	Total private equity		29			73				1				6
	Mezzanine debt:
	Less than 10%		11			18				(2		)		5
	Greater than or equal to 10% but less than 50%		3			9				0				2
	Greater than 50%		1			0				1				(1		)
	Total mezzanine debt		15			27				(1		)		6
	Real estate:
Less than 10%		12			55				4				(3		)
Greater than or equal to 10% but less than 50%		3			16				(1		)		1
Greater than 50%		3			9				2				0
Total real estate		18			80				5				(2		)
Total limited partnerships – Indemnity		62			$	180			$	5			$	10
Exchange
Private equity:
Less than 10%		42			$	424			$	22			$	24
Greater than or equal to 10% but less than 50%		3			58				16				(1		)
Greater than 50%		0			0				0				0
Total private equity		45			482				38				23
Mezzanine debt:
Less than 10%		18			132				(5		)		29
Greater than or equal to 10% but less than 50%		4			27				1				4
Greater than 50%		3			37				(2		)		5
Total mezzanine debt		25			196				(6		)		38
Real estate:
Less than 10%		22			274				(7		)		26
Greater than or equal to 10% but less than 50%		5			52				(4		)		3
Greater than 50%		3			33				6				(1		)
Total real estate		30			359				(5		)		28
Total limited partnerships – Exchange		100			$	1,037			$	27			$	89
Total limited partnerships – Erie Insurance Group					$	1,217			$	32			$	99

Postretirement_Benefits_Tables

Postretirement Benefits (Tables)	9 Months Ended
	Sep. 30, 2013
Compensation and Retirement Disclosure [Abstract]	'
Schedule of cost of pension plans	'
	The cost of our pension plans are as follows:
		Erie Insurance Group
	(in millions)	Three months ended September 30,						Nine months ended September 30,
		2013			2012			2013			2012
	Service cost for benefits earned	$	7		$	5		$	20		$	16
	Interest cost on benefits obligation	6			6			19			18
	Expected return on plan assets	(8		)	(6		)	(23		)	(20		)
	Prior service cost amortization	0			1			1			1
	Net actuarial loss amortization	4			2			11			8
	Pension plan cost	$	9		$	8		$	28		$	23

Indemnity_Accumulated_Other_Co1

Indemnity Accumulated Other Comprehensive Income (Loss) (Tables)	9 Months Ended
	Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]	'
Schedule of changes in Indemnity's accumulated other comprehensive loss by component attributable to the Indemnity shareholder interest	'
	Changes in Indemnity's accumulated other comprehensive loss by component attributable to the Indemnity shareholder interest is presented as follows for the nine months ended September 30, 2013:
			Indemnity Shareholder Interest
	(in millions)		Unrealized holding gains (losses) on available-for-sale securities			Postretirement plans(2)			Total
	Balance at December 31, 2012		$	13		$	(146	)	$	(133	)
	Other comprehensive loss before reclassifications, net of tax		(8		)	0			(8		)
	Amounts reclassified from accumulated other comprehensive loss, net of tax(1)		1			0			1
	Net current period other comprehensive loss, net of tax		(7		)	0			(7		)
	Balance at September 30, 2013		$	6		$	(146	)	$	(140	)
	-1	See the following table for details about these reclassifications.
	-2	There are no amounts reclassified out of accumulated other comprehensive loss related to postretirement plan items during interim periods.
Schedule of amounts reclassified out of accumulated other comprehensive income (loss) and the related affected line item in the Consolidated Statements of Operations where net income is presented	'
	Amounts reclassified out of accumulated other comprehensive income (loss) and the related affected line item in the Consolidated Statements of Operations where net income is presented are as follows for the three and nine months ended September 30, 2013:
			Erie Insurance Group
			Three months ended			Nine months ended
			30-Sep-13			30-Sep-13
	(in millions)		Amounts reclassified from accumulated other comprehensive income (loss)(1)
	Unrealized holding gains (losses) on available-for-sale securities:
	Net realized investment losses		$	(24	)	$	(3	)
	Net impairment losses recognized in earnings		(9		)	(10		)
	Loss from operations before income taxes and noncontrolling interest		(33		)	(13		)
	Provision for income taxes		(12		)	(5		)
	Net loss		(21		)	(8		)
	Less: Net loss attributable to noncontrolling interest in consolidated entity – Exchange		(22		)	(9		)
	Net income attributable to Indemnity		$	1		$	1
	Amortization of postretirement plan items(2):
	Net income attributable to Indemnity		$	0		$	0
	Net income attributable to Indemnity		$	1		$	1
	-1	Positive amounts indicate net income, while negative amounts indicate net loss.
	-2	There are no amounts reclassified out of accumulated other comprehensive loss related to postretirement plan items during interim periods.

Indemnity_Shareholders_Equity_1

Indemnity Shareholders' Equity and Noncontrolling Interest (Tables)	9 Months Ended
	Sep. 30, 2013
Stockholders' Equity Note [Abstract]	'
Schedule of reconciliation of the beginning and ending balances of Indemnity's shareholders' equity and the noncontrolling interest	'
	A reconciliation of the beginning and ending balances of Indemnity's shareholders’ equity and the noncontrolling interest is presented as follows for the year ended December 31, 2012 and for the nine months ended September 30, 2013:
		Erie Insurance Group
	(in millions, except per share data)	Indemnity			Exchange			Erie
		shareholder			noncontrolling			Insurance
		interest			interest			Group
	Balance at December 31, 2011	$	781		$	5,512		$	6,293
	Net income	160			459			619
	Change in other comprehensive (loss) income, net of tax	(28		)	178			150
	Net purchase of treasury stock	(69		)	—			(69		)
	Dividends declared:
	Class A $4.25 per share	(200		)	—			(200		)
	Class B $637.50 per share	(2		)	—			(2		)
	Balance at December 31, 2012	$	642		$	6,149		$	6,791
	Net income	127			607			734
	Change in other comprehensive loss, net of tax	(7		)	(214		)	(221		)
	Net purchase of treasury stock	(22		)	—			(22		)
	Dividends declared:
	Class A $1.7775 per share	(82		)	—			(82		)
	Class B $266.6250 per share	(1		)	—			(1		)
	Balance at September 30, 2013	$	657		$	6,542		$	7,199

Indemnity_Supplemental_Informa1

Indemnity Supplemental Information (Tables)	9 Months Ended
	Sep. 30, 2013
Condensed financial statements	'
Schedule of Consolidating Statement of Financial Position	'
	Consolidating Statement of Financial Position
		Erie Insurance Group
		At September 30, 2013
	(in millions)	Indemnity			Exchange			Reclassifications			Erie
		shareholder			noncontrolling			and			Insurance
		interest			interest			eliminations			Group
	Assets
	Investments
	Available-for-sale securities, at fair value:
	Fixed maturities	$	499		$	7,921		$	—		$	8,420
	Equity securities	48			849			—			897
	Trading securities, at fair value	0			2,945			—			2,945
	Limited partnerships	158			979			—			1,137
	Other invested assets	1			20			—			21
	Total investments	706			12,714			—			13,420
	Cash and cash equivalents	33			502			—			535
	Premiums receivable from policyholders	—			1,203			—			1,203
	Reinsurance recoverable	—			174			—			174
	Deferred income tax asset	42			0			—			42
	Deferred acquisition costs	—			574			—			574
	Other assets	107			329			—			436
	Receivables from the Exchange and other affiliates	320			—			(320		)	—
	Note receivable from EFL	25			—			(25		)	—
	Total assets	$	1,233		$	15,496		$	(345	)	$	16,384
	Liabilities
	Losses and loss expense reserves	$	—		$	3,712		$	—		$	3,712
	Life policy and deposit contract reserves	—			1,754			—			1,754
	Unearned premiums	—			2,654			—			2,654
	Deferred income tax liability	0			368			—			368
	Other liabilities	576			466			(345		)	697
	Total liabilities	576			8,954			(345		)	9,185
	Shareholders’ equity and noncontrolling interest
	Total Indemnity shareholders’ equity	657			—			—			657
	Noncontrolling interest in consolidated entity – Exchange	—			6,542			—			6,542
	Total equity	657			6,542			—			7,199
	Total liabilities, shareholders’ equity and noncontrolling interest	$	1,233		$	15,496		$	(345	)	$	16,384
	Consolidating Statement of Financial Position
		Erie Insurance Group
		At December 31, 2012
	(in millions)	Indemnity			Exchange			Reclassifications			Erie
		shareholder			noncontrolling			and			Insurance
		interest			interest			eliminations			Group
	Assets
	Investments
	Available-for-sale securities, at fair value:
	Fixed maturities	$	452		$	7,707		$	—		$	8,159
	Equity securities	55			945			—			1,000
	Trading securities, at fair value	0			2,417			—			2,417
	Limited partnerships	180			1,037			—			1,217
	Other invested assets	1			20			—			21
	Total investments	688			12,126			—			12,814
	Cash and cash equivalents	12			388			—			400
	Premiums receivable from policyholders	—			1,062			—			1,062
	Reinsurance recoverable	—			168			—			168
	Deferred income tax asset	37			0			—			37
	Deferred acquisition costs	—			504			—			504
	Other assets	117			339			—			456
	Receivables from the Exchange and other affiliates	281			—			(281		)	—
	Note receivable from EFL	25			—			(25		)	—
	Total assets	$	1,160		$	14,587		$	(306	)	$	15,441
	Liabilities
	Losses and loss expense reserves	$	—		$	3,598		$	—		$	3,598
	Life policy and deposit contract reserves	—			1,708			—			1,708
Unearned premiums	—			2,365			—			2,365
Deferred income tax liability	0			365			—			365
Other liabilities	518			402			(306		)	614
Total liabilities	518			8,438			(306		)	8,650
Shareholders’ equity and noncontrolling interest
Total Indemnity shareholders’ equity	642			—			—			642
Noncontrolling interest in consolidated entity – Exchange	—			6,149			—			6,149
Total equity	642			6,149			—			6,791
Total liabilities, shareholders’ equity and noncontrolling interest	$	1,160		$	14,587		$	(306	)	$	15,441
Indemnity	'
Condensed financial statements	'
Schedule of Income attributable to Indemnity shareholder interest	'
	Income attributable to Indemnity shareholder interest
		Indemnity Shareholder Interest
	(in millions)	Three months ended September 30,						Nine months ended September 30,
		2013			2012			2013			2012
	Management operations:
	Management fee revenue, net	$	333		$	305		$	965		$	882
	Service agreement revenue	8			8			23			23
	Total revenue from management operations	341			313			988			905
	Cost of management operations	281			247			820			734
	Income from management operations before taxes	60			66			168			171
	Investment operations:
	Net investment income	4			4			11			12
	Net realized gains on investments	1			2			1			4
	Net impairment losses recognized in earnings	0			0			0			0
	Equity in earnings of limited partnerships	5			6			13			10
	Income from investment operations before taxes	10			12			25			26
	Income from operations before income taxes	70			78			193			197
	Provision for income taxes	24			27			66			67
	Net income attributable to Indemnity	$	46		$	51		$	127		$	130
Schedule of Indemnity's components of direct cash flows as included in the Consolidated Statements of Cash Flows	'
	Indemnity’s components of direct cash flows as included in the Consolidated Statements of Cash Flows
		Indemnity Shareholder Interest
	(in millions)	Nine months ended September 30,
		2013			2012
	Management fee received	$	933		$	851
	Service agreement fee received	23			23
	Net investment income received	16			19
	Limited partnership distributions	18			11
	Decrease in reimbursements collected from affiliates	(8		)	(2		)
	Commissions and bonuses paid to agents	(521		)	(470		)
	Salaries and wages paid	(110		)	(99		)
	Pension contribution and employee benefits paid	(33		)	(36		)
	General operating expenses paid	(124		)	(99		)
	Income taxes paid	(62		)	(54		)
	Net cash provided by operating activities	132			144
	Net cash used in investing activities	(33		)	(8		)
	Net cash used in financing activities	(78		)	(135		)
	Net increase in cash and cash equivalents	21			1
	Cash and cash equivalents at beginning of period	12			11
	Cash and cash equivalents at end of period	$	33		$	12

Nature_of_Operations_Details

Nature of Operations (Details) (Property and casualty insurance operations)	Sep. 30, 2013
	States
Property and casualty insurance operations	'
Product information	'
Number of states in which the Property and Casualty Group operates	11

Indemnity_Earnings_Per_Share_D

Indemnity Earnings Per Share (Details) (Indemnity, USD $)	3 Months Ended		9 Months Ended
In Millions, except Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Class A	'	'	'	'	'
Income available to stockholders	'	'	'	'	'
Allocated net income (numerator) (in dollars)	$46	$51	$126	$129	'
Weighted shares (denominator) (in shares)	46,656,911	47,188,741	46,707,971	47,476,693	'
Per-share amount (in dollars per share)	$0.98	$1.08	$2.71	$2.73	'
Dilutive effect of stock-based awards	'	'	'	'	'
Allocated net income (numerator) (in dollars)	0	0	0	0	'
Weighted shares (denominator) (in shares)	93,539	80,505	93,539	80,505	'
Assumed conversion of Class B shares	'	'	'	'	'
Allocated net income (numerator) (in dollars)	0	0	1	1	'
Weighted shares (denominator) (in shares)	6,100,800	6,105,600	6,100,800	6,105,600	'
Income available to stockholders on equivalent shares	'	'	'	'	'
Allocated net income (numerator) (in dollars)	46	51	127	130	'
Weighted shares (denominator) (in shares)	52,851,250	53,374,846	52,902,310	53,662,798	'
Per-share amount (in dollars per share)	$0.87	$0.96	$2.41	$2.43	'
Class B	'	'	'	'	'
Reconciliation of the numerators and denominators used in the basic and diluted per-share computations	'	'	'	'	'
Ratio for converting shares of Class B common stock into shares of Class A common stock (as a percent)	2400.00%	'	2400.00%	'	2400.00%
Income available to stockholders	'	'	'	'	'
Allocated net income (numerator) (in dollars)	0	0	1	1	'
Weighted shares (denominator) (in shares)	2,542	2,544	2,542	2,544	'
Per-share amount (in dollars per share)	$147	$162	$406	$411	'
Income available to stockholders on equivalent shares	'	'	'	'	'
Allocated net income (numerator) (in dollars)	$0	$0	$1	$1	'
Weighted shares (denominator) (in shares)	2,542	2,544	2,542	2,544	'
Per-share amount (in dollars per share)	$147	$162	$406	$411	'

Variable_Interest_Entity_Detai

Variable Interest Entity (Details) (Indemnity)	9 Months Ended
	Sep. 30, 2013
Indemnity	'
Variable Interest Entity disclosures	'
Indemnity's maximum management fee rate as a percent of premiums written and assumed by the Exchange (as a percent)	25.00%

Segment_Information_Details

Segment Information (Details) (USD $)

3 Months Ended

9 Months Ended

12 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

In Millions, unless otherwise specified

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Dec. 31, 2012

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Jun. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Management operations

Operating segment

Operating segment

Operating segment

Operating segment

Operating segment

Operating segment

Operating segment

Operating segment

Operating segment

Operating segment

Operating segment

Operating segment

Operating segment

Operating segment

Operating segment

Operating segment

Operating segment

Operating segment

Operating segment

Operating segment

Operating segment

Eliminations

Eliminations

Eliminations

Eliminations

Management operations

Management operations

Management operations

Management operations

Management operations

Property and casualty insurance operations

Property and casualty insurance operations

Property and casualty insurance operations

Property and casualty insurance operations

Life insurance operations

Life insurance operations

Life insurance operations

Life insurance operations

Life insurance operations

Life insurance operations

Life insurance operations

Life insurance operations

Investment operations

Investment operations

Investment operations

Investment operations

Erie Family Life Insurance Company (EFL)

Erie Family Life Insurance Company (EFL)

Erie Family Life Insurance Company (EFL)

Erie Family Life Insurance Company (EFL)

Segment information

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Indemnity's maximum management fee rate as a percent of premiums written and assumed by the Exchange (as a percent)

'

'

'

'

'

'

'

'

'

25.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Reduction in commission expense due to adjustment

'

'

'

'

'

$6

'

'

$6

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Indemnity commission expense adjustment description

'

'

'

'

'

'

'

'

'

'This amount represents the reimbursement by the North Carolina Reinsurance Facility (NCRF) for commissions Indemnity paid to agents on the surcharges collected on behalf of the NCRF which was incorrectly recorded as a benefit to the Exchange in prior periods.

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total investment revenues

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

26

25

78

77

'

'

'

'

'

'

'

'

Revenues

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Premiums earned/life policy revenue

1,241

1,137

3,631

3,333

'

'

'

'

'

'

'

1,221

1,118

3,573

3,279

21

19

60

55

'

'

'

'

'

'

'

'

-1

0

-2

-1

Net investment income

109

105

316

326

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

111

108

324

334

-2

-3

-8

-8

Net realized investment gains (losses)

191

169

501

358

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

191

169

501

358

'

'

'

'

Net impairment losses recognized in earnings

-9

0

-10

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-9

0

-10

0

'

'

'

'

Equity in earnings of limited partnerships

37

41

112

99

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

37

41

112

99

'

'

'

'

Management fee revenue

'

'

'

'

'

'

333

305

'

965

882

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-333

-305

-965

-882

Service agreement and other revenue

8

8

24

24

'

'

8

8

'

23

23

'

'

'

'

0

0

1

1

'

'

'

'

'

'

'

'

'

'

'

'

Total revenues

1,577

1,460

4,574

4,140

'

'

341

313

'

988

905

1,221

1,118

3,573

3,279

21

19

61

56

'

'

'

'

330

318

927

791

-336

-308

-975

-891

Benefits and expenses

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Cost of management operations

'

'

'

'

'

'

281

247

'

820

734

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-281

-247

-820

-734

Insurance losses and loss expenses

868

912

2,571

2,571

'

'

'

'

'

'

'

841

890

2,495

2,501

28

24

80

74

'

'

'

'

'

'

'

'

-1

-2

-4

-4

Policy acquisition and underwriting expenses

311

278

906

835

'

'

'

'

'

'

'

356

329

1,032

963

9

8

25

25

'

'

'

'

'

'

'

'

-54

-59

-151

-153

Total benefits and expenses

1,179

1,190

3,477

3,406

'

'

281

247

'

820

734

1,197

1,219

3,527

3,464

37

32

105

99

'

'

'

'

'

'

'

'

-336

-308

-975

-891

Income (loss) from operations before income taxes and noncontrolling interest

398

270

1,097

734

'

'

60

66

'

168

171

24

-101

46

-185

-16

-13

-44

-43

10

12

34

34

330

318

927

791

'

'

'

'

Provision for income taxes

131

86

363

234

'

'

21

23

'

59

60

8

-36

16

-65

-5

-4

-15

-15

'

'

'

'

107

103

303

254

'

'

'

'

Net income (loss)

$267

$184

$734

$500

$619

'

$39

$43

'

$109

$111

$16

($65)

$30

($120)

($11)

($9)

($29)

($28)

'

'

'

'

$223

$215

$624

$537

'

'

'

'

Fair_Value_Details

Fair Value (Details) (USD $)

9 Months Ended

9 Months Ended

12 Months Ended

9 Months Ended

12 Months Ended

9 Months Ended

12 Months Ended

9 Months Ended

12 Months Ended

In Millions, unless otherwise specified

Sep. 30, 2013

Sep. 30, 2012

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Exchange

Minimum

Minimum

Maximum

Maximum

Level 1

Level 1

Level 2

Level 2

Level 3

Level 3

Level 3

Level 3

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Fair value measurements on a recurring basis

Real estate

Real estate

Fixed maturities

Fixed maturities

States & political subdivisions

States & political subdivisions

Corporate debt securities

Corporate debt securities

Commercial mortgage-backed securities

Collateralized debt obligations

Collateralized debt obligations

Nonredeemable preferred stock

Nonredeemable preferred stock

Common stock

Common stock

Real estate

Real estate

Level 1

Level 1

Level 1

Level 1

Level 1

Level 1

Level 1

Level 1

Level 1

Level 1

Level 1

Level 1

Level 1

Level 1

Level 1

Level 1

Level 1

Level 2

Level 2

Level 2

Level 2

Level 2

Level 2

Level 2

Level 2

Level 2

Level 2

Level 2

Level 2

Level 2

Level 2

Level 2

Level 2

Level 2

Level 3

Level 3

Level 3

Level 3

Level 3

Level 3

Level 3

Level 3

Level 3

Level 3

Level 3

Level 3

Level 3

Level 3

Level 3

Level 3

Level 3

Fixed maturities

Fixed maturities

U.S. government & agencies

U.S. government & agencies

States & political subdivisions

States & political subdivisions

Foreign government securities

Foreign government securities

Corporate debt securities

Corporate debt securities

Residential mortgage-backed securities

Residential mortgage-backed securities

Commercial mortgage-backed securities

Commercial mortgage-backed securities

Collateralized debt obligations

Collateralized debt obligations

Other debt securities

Other debt securities

Nonredeemable preferred stock

Nonredeemable preferred stock

Common stock

Common stock

Real estate

Real estate

Level 1

Level 1

Level 1

Level 1

Level 1

Level 1

Level 1

Level 1

Level 1

Level 1

Level 1

Level 1

Level 1

Level 1

Level 1

Level 1

Level 1

Level 1

Level 1

Level 1

Level 1

Level 1

Level 1

Level 1

Level 1

Level 1

Level 2

Level 2

Level 2

Level 2

Level 2

Level 2

Level 2

Level 2

Level 2

Level 2

Level 2

Level 2

Level 2

Level 2

Level 2

Level 2

Level 2

Level 2

Level 2

Level 2

Level 2

Level 2

Level 2

Level 2

Level 2

Level 2

Level 3

Level 3

Level 3

Level 3

Level 3

Level 3

Level 3

Level 3

Level 3

Level 3

Level 3

Level 3

Level 3

Level 3

Level 3

Level 3

Level 3

Level 3

Level 3

Level 3

Level 3

Level 3

Level 3

Level 3

Level 3

Level 3

Level 3

Level 3

Level 3

Level 3

fund

fund

Fixed maturities

Fixed maturities

States & political subdivisions

States & political subdivisions

Corporate debt securities

Corporate debt securities

Commercial mortgage-backed securities

Collateralized debt obligations

Collateralized debt obligations

Nonredeemable preferred stock

Nonredeemable preferred stock

Common stock

Common stock

Real estate

Real estate

Fixed maturities

Fixed maturities

States & political subdivisions

States & political subdivisions

Corporate debt securities

Corporate debt securities

Commercial mortgage-backed securities

Collateralized debt obligations

Collateralized debt obligations

Nonredeemable preferred stock

Nonredeemable preferred stock

Common stock

Common stock

Real estate

Real estate

Fixed maturities

Fixed maturities

States & political subdivisions

States & political subdivisions

Corporate debt securities

Corporate debt securities

Commercial mortgage-backed securities

Collateralized debt obligations

Collateralized debt obligations

Nonredeemable preferred stock

Nonredeemable preferred stock

Common stock

Common stock

Real estate

Real estate

Fixed maturities

Fixed maturities

U.S. government & agencies

U.S. government & agencies

States & political subdivisions

States & political subdivisions

Foreign government securities

Foreign government securities

Corporate debt securities

Corporate debt securities

Residential mortgage-backed securities

Residential mortgage-backed securities

Commercial mortgage-backed securities

Commercial mortgage-backed securities

Collateralized debt obligations

Collateralized debt obligations

Other debt securities

Other debt securities

Nonredeemable preferred stock

Nonredeemable preferred stock

Common stock

Common stock

Real estate

Real estate

Fixed maturities

Fixed maturities

U.S. government & agencies

U.S. government & agencies

States & political subdivisions

States & political subdivisions

Foreign government securities

Foreign government securities

Corporate debt securities

Corporate debt securities

Residential mortgage-backed securities

Residential mortgage-backed securities

Commercial mortgage-backed securities

Commercial mortgage-backed securities

Collateralized debt obligations

Collateralized debt obligations

Other debt securities

Other debt securities

Nonredeemable preferred stock

Nonredeemable preferred stock

Common stock

Common stock

Real estate

Real estate

Fixed maturities

Fixed maturities

U.S. government & agencies

U.S. government & agencies

States & political subdivisions

States & political subdivisions

Foreign government securities

Foreign government securities

Corporate debt securities

Corporate debt securities

Residential mortgage-backed securities

Residential mortgage-backed securities

Commercial mortgage-backed securities

Commercial mortgage-backed securities

Collateralized debt obligations

Collateralized debt obligations

Other debt securities

Other debt securities

Nonredeemable preferred stock

Nonredeemable preferred stock

Common stock

Common stock

Real estate

Real estate

Real estate

Real estate

Real estate

Real estate

Fair value measurements on a recurring basis by asset class and level of input

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Available-for-sale securities

$9,317

'

$9,159

'

'

'

'

'

'

'

'

'

'

$547

$507

$547

$507

$499

$452

$219

$185

$279

$261

$3

$1

$3

$23

$29

$25

$26

'

'

$27

$30

$0

$0

$0

$0

$0

$0

$0

$0

$0

$2

$4

$25

$26

'

'

$518

$473

$497

$448

$219

$185

$278

$260

$3

$0

$0

$21

$25

$0

$0

'

'

$2

$4

$2

$4

$0

$0

$1

$1

$0

$1

$3

$0

$0

$0

$0

'

'

$8,770

$8,652

$8,770

$8,652

$7,921

$7,707

$173

$191

$1,431

$1,321

$15

$16

$5,969

$5,777

$199

$231

$48

$67

$20

$49

$66

$55

$611

$631

$238

$314

'

'

$468

$513

$0

$0

$0

$0

$0

$0

$0

$0

$0

$0

$0

$0

$0

$0

$0

$0

$0

$0

$230

$199

$238

$314

'

'

$8,267

$8,080

$7,886

$7,648

$173

$191

$1,431

$1,321

$15

$16

$5,943

$5,734

$199

$231

$48

$67

$11

$33

$66

$55

$381

$432

$0

$0

'

'

$35

$59

$35

$59

$0

$0

$0

$0

$0

$0

$26

$43

$0

$0

$0

$0

$9

$16

$0

$0

$0

$0

$0

$0

'

'

'

'

'

'

Trading securities

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2,945

2,417

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2,945

2,417

'

'

2,931

2,402

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2,931

2,402

'

'

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

0

'

'

14

15

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

14

15

'

'

'

'

'

'

Other investments

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

19

19

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

19

19

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

100

109

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

100

109

'

'

'

'

Total

'

'

'

12,381

11,704

3,426

2,945

8,785

8,553

170

206

'

'

'

'

566

526

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

27

30

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

518

473

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

21

23

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

11,815

11,178

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3,399

2,915

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

8,267

8,080

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

149

183

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Other investments:

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of real estate funds reported under fair value option

'

'

'

'

'

'

'

'

'

'

'

4

4

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Underlying assets, liquidation period from inception of fund

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'5 years

'5 years

'10 years

'10 years

Contributions made to the funds

66

64

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

0.2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

0.7

'

'

'

'

Distributions received from the funds

125

141

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1.4

0.3

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

18.3

4.7

'

'

'

'

Unfunded commitments

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$1.50

$1.50

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$4.50

$4.50

'

'

'

'

Fair_Value_Details_2

Fair Value (Details 2) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Level 3	'	'	'	'
Roll forward of consolidated level 3 fair value measurements on a recurring basis	'	'	'	'
Beginning balance	$198	$208	$206	$190
Included in earnings	6	2	14	13
Included in other comprehensive income	-3	2	-1	5
Purchases	4	0	9	1
Sales	-24	-7	-50	-17
Transfers in and (out) of Level 3	-11	33	-8	46
Ending balance	170	238	170	238
Level 3 | Net realized investment gains losses	'	'	'	'
Roll forward of consolidated level 3 fair value measurements on a recurring basis	'	'	'	'
Included in earnings	3	-1	4	3
Level 3 | Equity in earnings of limited partnerships	'	'	'	'
Roll forward of consolidated level 3 fair value measurements on a recurring basis	'	'	'	'
Included in earnings	3	3	10	10
Indemnity	'	'	'	'
Fair value transfers due to changes in available market observable inputs	'	'	'	'
Transfers from level 1 to level 2	0	2	0	3
Transfers from level 2 to level 1	0	1	1	1
Transfers from level 2 to level 3	0	0	0	1
Transfers from level 3 to level 2	0	0	0	0
Indemnity | Fixed maturities	'	'	'	'
Fair value transfers due to changes in available market observable inputs	'	'	'	'
No. of securities transferred between Level 2 and Level 3	'	'	'	1
Indemnity | Nonredeemable preferred stock	'	'	'	'
Fair value transfers due to changes in available market observable inputs	'	'	'	'
No. of securities transferred between Level 1 and Level 2	'	1	'	2
No. of securities transferred between Level 2 and Level 1	'	1	1	1
Indemnity | Level 3	'	'	'	'
Roll forward of consolidated level 3 fair value measurements on a recurring basis	'	'	'	'
Beginning balance	22	23	23	21
Included in earnings	0	0	1	1
Included in other comprehensive income	0	0	0	0
Purchases	0	0	0	0
Sales	-1	-1	-3	-1
Transfers in and (out) of Level 3	0	0	0	1
Ending balance	21	22	21	22
Indemnity | Level 3 | Available-for-sale securities	'	'	'	'
Roll forward of consolidated level 3 fair value measurements on a recurring basis	'	'	'	'
Beginning balance	2	5	4	4
Included in earnings	0	0	0	0
Included in other comprehensive income	0	0	0	0
Purchases	0	0	0	0
Sales	0	-1	-2	-1
Transfers in and (out) of Level 3	0	0	0	1
Ending balance	2	4	2	4
Indemnity | Level 3 | Fixed maturities | Available-for-sale securities	'	'	'	'
Roll forward of consolidated level 3 fair value measurements on a recurring basis	'	'	'	'
Beginning balance	2	5	4	4
Included in earnings	0	0	0	0
Included in other comprehensive income	0	0	0	0
Purchases	0	0	0	0
Sales	0	-1	-2	-1
Transfers in and (out) of Level 3	0	0	0	1
Ending balance	2	4	2	4
Indemnity | Level 3 | Corporate debt securities | Available-for-sale securities	'	'	'	'
Roll forward of consolidated level 3 fair value measurements on a recurring basis	'	'	'	'
Beginning balance	1	1	1	0
Included in earnings	0	0	0	0
Included in other comprehensive income	0	0	0	0
Purchases	0	0	0	0
Sales	0	0	0	0
Transfers in and (out) of Level 3	0	0	0	1
Ending balance	1	1	1	1
Indemnity | Level 3 | Collateralized debt obligations | Available-for-sale securities	'	'	'	'
Roll forward of consolidated level 3 fair value measurements on a recurring basis	'	'	'	'
Beginning balance	1	4	3	4
Included in earnings	0	0	0	0
Included in other comprehensive income	0	0	0	0
Purchases	0	0	0	0
Sales	0	-1	-2	-1
Transfers in and (out) of Level 3	0	0	0	0
Ending balance	1	3	1	3
Indemnity | Level 3 | Real estate | Limited partnerships	'	'	'	'
Roll forward of consolidated level 3 fair value measurements on a recurring basis	'	'	'	'
Beginning balance	20	18	19	17
Included in earnings	0	0	1	1
Included in other comprehensive income	0	0	0	0
Purchases	0	0	0	0
Sales	-1	0	-1	0
Transfers in and (out) of Level 3	0	0	0	0
Ending balance	19	18	19	18
Exchange	'	'	'	'
Fair value transfers due to changes in available market observable inputs	'	'	'	'
Transfers from level 1 to level 2	0	42	6	56
Transfers from level 2 to level 1	0	35	51	53
Transfers from level 2 to level 3	0	34	39	46
Transfers from level 3 to level 2	11	1	47	1
Exchange | Fixed maturities	'	'	'	'
Fair value transfers due to changes in available market observable inputs	'	'	'	'
No. of securities transferred between Level 2 and Level 3	'	4	7	8
No. of securities transferred between Level 3 and Level 2	2	1	6	1
Exchange | Nonredeemable preferred stock	'	'	'	'
Fair value transfers due to changes in available market observable inputs	'	'	'	'
No. of securities transferred between Level 1 and Level 2	'	3	1	6
No. of securities transferred between Level 2 and Level 1	'	5	5	6
No. of securities transferred between Level 2 and Level 3	'	'	1	'
Exchange | Level 3	'	'	'	'
Roll forward of consolidated level 3 fair value measurements on a recurring basis	'	'	'	'
Beginning balance	176	185	183	169
Included in earnings	6	2	13	12
Included in other comprehensive income	-3	2	-1	5
Purchases	4	0	9	1
Sales	-23	-6	-47	-16
Transfers in and (out) of Level 3	-11	33	-8	45
Ending balance	149	216	149	216
Exchange | Level 3 | Available-for-sale securities	'	'	'	'
Roll forward of consolidated level 3 fair value measurements on a recurring basis	'	'	'	'
Beginning balance	56	64	59	55
Included in earnings	0	0	4	1
Included in other comprehensive income	-3	2	-1	5
Purchases	0	0	5	1
Sales	-7	-4	-24	-12
Transfers in and (out) of Level 3	-11	33	-8	45
Ending balance	35	95	35	95
Exchange | Level 3 | Trading securities	'	'	'	'
Roll forward of consolidated level 3 fair value measurements on a recurring basis	'	'	'	'
Beginning balance	7	14	15	12
Included in earnings	3	-1	0	2
Included in other comprehensive income	0	0	0	0
Purchases	4	0	4	0
Sales	0	0	-5	-1
Transfers in and (out) of Level 3	0	0	0	0
Ending balance	14	13	14	13
Exchange | Level 3 | Fixed maturities | Available-for-sale securities	'	'	'	'
Roll forward of consolidated level 3 fair value measurements on a recurring basis	'	'	'	'
Beginning balance	49	59	59	50
Included in earnings	0	0	2	1
Included in other comprehensive income	0	1	0	4
Purchases	0	0	1	1
Sales	-3	-4	-14	-12
Transfers in and (out) of Level 3	-11	33	-13	45
Ending balance	35	89	35	89
Exchange | Level 3 | States & political subdivisions | Available-for-sale securities	'	'	'	'
Roll forward of consolidated level 3 fair value measurements on a recurring basis	'	'	'	'
Beginning balance	'	4	'	4
Included in earnings	'	0	'	0
Included in other comprehensive income	'	0	'	0
Purchases	'	0	'	0
Sales	'	0	'	0
Transfers in and (out) of Level 3	'	0	'	0
Ending balance	'	4	'	4
Exchange | Level 3 | Corporate debt securities | Available-for-sale securities	'	'	'	'
Roll forward of consolidated level 3 fair value measurements on a recurring basis	'	'	'	'
Beginning balance	33	23	43	12
Included in earnings	0	0	0	0
Included in other comprehensive income	0	1	0	1
Purchases	0	0	1	1
Sales	0	0	-3	-5
Transfers in and (out) of Level 3	-7	10	-15	25
Ending balance	26	34	26	34
Exchange | Level 3 | Commercial mortgage-backed securities | Available-for-sale securities	'	'	'	'
Roll forward of consolidated level 3 fair value measurements on a recurring basis	'	'	'	'
Beginning balance	4	'	0	'
Included in earnings	0	'	0	'
Included in other comprehensive income	0	'	0	'
Purchases	0	'	0	'
Sales	0	'	-1	'
Transfers in and (out) of Level 3	-4	'	1	'
Ending balance	0	'	0	'
Exchange | Level 3 | Collateralized debt obligations | Available-for-sale securities	'	'	'	'
Roll forward of consolidated level 3 fair value measurements on a recurring basis	'	'	'	'
Beginning balance	12	27	16	29
Included in earnings	0	0	2	1
Included in other comprehensive income	0	0	0	3
Purchases	0	0	0	0
Sales	-3	-4	-10	-7
Transfers in and (out) of Level 3	0	23	1	20
Ending balance	9	46	9	46
Exchange | Level 3 | Other debt securities | Available-for-sale securities	'	'	'	'
Roll forward of consolidated level 3 fair value measurements on a recurring basis	'	'	'	'
Beginning balance	'	5	'	5
Included in earnings	'	0	'	0
Included in other comprehensive income	'	0	'	0
Purchases	'	0	'	0
Sales	'	0	'	0
Transfers in and (out) of Level 3	'	0	'	0
Ending balance	'	5	'	5
Exchange | Level 3 | Nonredeemable preferred stock | Available-for-sale securities	'	'	'	'
Roll forward of consolidated level 3 fair value measurements on a recurring basis	'	'	'	'
Beginning balance	7	5	0	5
Included in earnings	0	0	2	0
Included in other comprehensive income	-3	1	-1	1
Purchases	0	0	4	0
Sales	-4	0	-10	0
Transfers in and (out) of Level 3	0	0	5	0
Ending balance	0	6	0	6
Exchange | Level 3 | Common stock | Trading securities	'	'	'	'
Roll forward of consolidated level 3 fair value measurements on a recurring basis	'	'	'	'
Beginning balance	7	14	15	12
Included in earnings	3	-1	0	2
Included in other comprehensive income	0	0	0	0
Purchases	4	0	4	0
Sales	0	0	-5	-1
Transfers in and (out) of Level 3	0	0	0	0
Ending balance	14	13	14	13
Exchange | Level 3 | Real estate | Limited partnerships	'	'	'	'
Roll forward of consolidated level 3 fair value measurements on a recurring basis	'	'	'	'
Beginning balance	113	107	109	102
Included in earnings	3	3	9	9
Included in other comprehensive income	0	0	0	0
Purchases	0	0	0	0
Sales	-16	-2	-18	-3
Transfers in and (out) of Level 3	0	0	0	0
Ending balance	100	108	100	108
Fair value measurements on a recurring basis	'	'	'	'
Roll forward of consolidated level 3 fair value measurements on a recurring basis	'	'	'	'
Ending balance	170	'	170	'
Fair value measurements on a recurring basis | Indemnity	'	'	'	'
Roll forward of consolidated level 3 fair value measurements on a recurring basis	'	'	'	'
Ending balance	21	'	21	'
Fair value measurements on a recurring basis | Indemnity | Real estate	'	'	'	'
Roll forward of consolidated level 3 fair value measurements on a recurring basis	'	'	'	'
Ending balance	19	'	19	'
Fair value measurements on a recurring basis | Exchange	'	'	'	'
Roll forward of consolidated level 3 fair value measurements on a recurring basis	'	'	'	'
Ending balance	149	'	149	'
Fair value measurements on a recurring basis | Exchange | Real estate	'	'	'	'
Roll forward of consolidated level 3 fair value measurements on a recurring basis	'	'	'	'
Ending balance	$100	'	$100	'

Fair_Value_Details_3

Fair Value (Details 3) (Fair value measurements on a recurring basis, USD $)	9 Months Ended
In Millions, except Per Share data, unless otherwise specified	Sep. 30, 2013
	Holdings
Fair value inputs assets quantitative information	'
Fair value (in dollars)	$170
No. of holdings	27
Maximum	'
Unobservable input	'
Securities priced via unobservable inputs as a percentage of total portfolio (as a percent)	1.40%
Indemnity	'
Fair value inputs assets quantitative information	'
Fair value (in dollars)	21
No. of holdings	5
Indemnity | Corporate debt securities | Market approach	'
Fair value inputs assets quantitative information	'
Fair value (in dollars)	1
No. of holdings	1
Unobservable input	'
Non-binding broker quote (in dollars per share)	$112.32
Indemnity | Collateralized debt obligations | Income approach	'
Fair value inputs assets quantitative information	'
Fair value (in dollars)	1
No. of holdings	2
Indemnity | Collateralized debt obligations | Income approach | Minimum	'
Unobservable input	'
Repayment at maturity (as a percent)	35.00%
Discount rate (as a percent)	7.50%
Indemnity | Collateralized debt obligations | Income approach | Maximum	'
Unobservable input	'
Repayment at maturity (as a percent)	100.00%
Discount rate (as a percent)	15.00%
Indemnity | Collateralized debt obligations | Income approach | Weighted average	'
Unobservable input	'
Repayment at maturity (as a percent)	70.00%
Discount rate (as a percent)	11.00%
Indemnity | Real estate	'
Fair value inputs assets quantitative information	'
Fair value (in dollars)	19
No. of holdings	2
Exchange	'
Fair value inputs assets quantitative information	'
Fair value (in dollars)	149
No. of holdings	22
Exchange | Corporate debt securities | Market approach	'
Fair value inputs assets quantitative information	'
Fair value (in dollars)	26
No. of holdings	7
Unobservable input	'
Comparable security yield (as a percent)	6.00%
Exchange | Corporate debt securities | Market approach | Minimum	'
Unobservable input	'
Non-binding broker quote (in dollars per share)	$107.40
Comparable transaction EBITDA mutiples (as a multiple)	6.7
Exchange | Corporate debt securities | Market approach | Maximum	'
Unobservable input	'
Non-binding broker quote (in dollars per share)	$115.50
Comparable transaction EBITDA mutiples (as a multiple)	17.1
Exchange | Corporate debt securities | Market approach | Weighted average	'
Unobservable input	'
Non-binding broker quote (in dollars per share)	$110
Comparable transaction EBITDA mutiples (as a multiple)	8
Exchange | Collateralized debt obligations | Market approach	'
Fair value inputs assets quantitative information	'
Fair value (in dollars)	3
No. of holdings	3
Exchange | Collateralized debt obligations | Market approach | Minimum	'
Unobservable input	'
Non-binding broker quote (in dollars per share)	$21
Exchange | Collateralized debt obligations | Market approach | Maximum	'
Unobservable input	'
Non-binding broker quote (in dollars per share)	$64
Exchange | Collateralized debt obligations | Market approach | Weighted average	'
Unobservable input	'
Non-binding broker quote (in dollars per share)	$51
Exchange | Collateralized debt obligations | Income approach	'
Fair value inputs assets quantitative information	'
Fair value (in dollars)	6
No. of holdings	4
Unobservable input	'
Projected LIBOR rate (as a percent)	0.26%
Exchange | Collateralized debt obligations | Income approach | Minimum	'
Unobservable input	'
Repayment at maturity (as a percent)	35.00%
Discount rate (as a percent)	7.00%
Exchange | Collateralized debt obligations | Income approach | Maximum	'
Unobservable input	'
Repayment at maturity (as a percent)	100.00%
Discount rate (as a percent)	18.00%
Exchange | Collateralized debt obligations | Income approach | Weighted average	'
Unobservable input	'
Repayment at maturity (as a percent)	90.00%
Discount rate (as a percent)	9.00%
Exchange | Common stock | Market approach	'
Fair value inputs assets quantitative information	'
Fair value (in dollars)	14
No. of holdings	4
Exchange | Common stock | Market approach | Minimum	'
Unobservable input	'
Comparable transaction EBITDA mutiples (as a multiple)	6.7
Discount for lack of marketability (as a percent)	5.00%
Exchange | Common stock | Market approach | Maximum	'
Unobservable input	'
Comparable transaction EBITDA mutiples (as a multiple)	17.1
Discount for lack of marketability (as a percent)	30.00%
Exchange | Common stock | Market approach | Weighted average	'
Unobservable input	'
Comparable transaction EBITDA mutiples (as a multiple)	8
Discount for lack of marketability (as a percent)	30.00%
Exchange | Real estate	'
Fair value inputs assets quantitative information	'
Fair value (in dollars)	$100
No. of holdings	4

Fair_Value_Details_4

Fair Value (Details 4) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Fair value by pricing source	'	'
Available-for-sale securities	$9,317	$9,159
Indemnity	'	'
Fair value by pricing source	'	'
Available-for-sale securities	547	507
Exchange	'	'
Fair value by pricing source	'	'
Available-for-sale securities	8,770	8,652
Fair value measurements on a recurring basis	'	'
Fair value by pricing source	'	'
Total	12,381	11,704
Fair value measurements on a recurring basis | Indemnity	'	'
Fair value by pricing source	'	'
Available-for-sale securities	547	507
Total	566	526
Fair value measurements on a recurring basis | Indemnity | Fixed maturities	'	'
Fair value by pricing source	'	'
Available-for-sale securities	499	452
Fair value measurements on a recurring basis | Indemnity | Fixed maturities | Priced via pricing services	'	'
Fair value by pricing source	'	'
Available-for-sale securities	497	'
Fair value measurements on a recurring basis | Indemnity | Fixed maturities | Priced via market comparables/broker quotes	'	'
Fair value by pricing source	'	'
Available-for-sale securities	1	'
Fair value measurements on a recurring basis | Indemnity | Fixed maturities | Priced via internal modeling	'	'
Fair value by pricing source	'	'
Available-for-sale securities	1	'
Fair value measurements on a recurring basis | Indemnity | Nonredeemable preferred stock	'	'
Fair value by pricing source	'	'
Available-for-sale securities	23	29
Fair value measurements on a recurring basis | Indemnity | Nonredeemable preferred stock | Priced via pricing services	'	'
Fair value by pricing source	'	'
Available-for-sale securities	21	'
Fair value measurements on a recurring basis | Indemnity | Nonredeemable preferred stock | Priced via market comparables/broker quotes	'	'
Fair value by pricing source	'	'
Available-for-sale securities	2	'
Fair value measurements on a recurring basis | Indemnity | Nonredeemable preferred stock | Priced via internal modeling	'	'
Fair value by pricing source	'	'
Available-for-sale securities	0	'
Fair value measurements on a recurring basis | Indemnity | Common stock	'	'
Fair value by pricing source	'	'
Available-for-sale securities	25	26
Fair value measurements on a recurring basis | Indemnity | Common stock | Priced via pricing services	'	'
Fair value by pricing source	'	'
Available-for-sale securities	25	'
Fair value measurements on a recurring basis | Indemnity | Common stock | Priced via market comparables/broker quotes	'	'
Fair value by pricing source	'	'
Available-for-sale securities	0	'
Fair value measurements on a recurring basis | Indemnity | Common stock | Priced via internal modeling	'	'
Fair value by pricing source	'	'
Available-for-sale securities	0	'
Fair value measurements on a recurring basis | Indemnity | Real estate	'	'
Fair value by pricing source	'	'
Other investments	19	19
Fair value measurements on a recurring basis | Indemnity | Real estate | Priced via unobservable inputs	'	'
Fair value by pricing source	'	'
Other investments	19	'
Fair value measurements on a recurring basis | Exchange	'	'
Fair value by pricing source	'	'
Available-for-sale securities	8,770	8,652
Total	11,815	11,178
Fair value measurements on a recurring basis | Exchange | Fixed maturities	'	'
Fair value by pricing source	'	'
Available-for-sale securities	7,921	7,707
Fair value measurements on a recurring basis | Exchange | Fixed maturities | Priced via pricing services	'	'
Fair value by pricing source	'	'
Available-for-sale securities	7,836	'
Fair value measurements on a recurring basis | Exchange | Fixed maturities | Priced via market comparables/broker quotes	'	'
Fair value by pricing source	'	'
Available-for-sale securities	71	'
Fair value measurements on a recurring basis | Exchange | Fixed maturities | Priced via internal modeling	'	'
Fair value by pricing source	'	'
Available-for-sale securities	14	'
Fair value measurements on a recurring basis | Exchange | Nonredeemable preferred stock	'	'
Fair value by pricing source	'	'
Available-for-sale securities	611	631
Fair value measurements on a recurring basis | Exchange | Nonredeemable preferred stock | Priced via pricing services	'	'
Fair value by pricing source	'	'
Available-for-sale securities	597	'
Fair value measurements on a recurring basis | Exchange | Nonredeemable preferred stock | Priced via market comparables/broker quotes	'	'
Fair value by pricing source	'	'
Available-for-sale securities	14	'
Fair value measurements on a recurring basis | Exchange | Nonredeemable preferred stock | Priced via internal modeling	'	'
Fair value by pricing source	'	'
Available-for-sale securities	0	'
Fair value measurements on a recurring basis | Exchange | Common stock	'	'
Fair value by pricing source	'	'
Available-for-sale securities	238	314
Trading and available-for-sale securities	3,183	'
Fair value measurements on a recurring basis | Exchange | Common stock | Priced via pricing services	'	'
Fair value by pricing source	'	'
Trading and available-for-sale securities	3,169	'
Fair value measurements on a recurring basis | Exchange | Common stock | Priced via market comparables/broker quotes	'	'
Fair value by pricing source	'	'
Trading and available-for-sale securities	0	'
Fair value measurements on a recurring basis | Exchange | Common stock | Priced via internal modeling	'	'
Fair value by pricing source	'	'
Trading and available-for-sale securities	14	'
Fair value measurements on a recurring basis | Exchange | Real estate	'	'
Fair value by pricing source	'	'
Other investments	100	109
Fair value measurements on a recurring basis | Exchange | Real estate | Priced via unobservable inputs	'	'
Fair value by pricing source	'	'
Other investments	100	'
Fair value measurements on a recurring basis | Level 1	'	'
Fair value by pricing source	'	'
Total	3,426	2,945
Fair value measurements on a recurring basis | Level 1 | Indemnity	'	'
Fair value by pricing source	'	'
Available-for-sale securities	27	30
Total	27	30
Fair value measurements on a recurring basis | Level 1 | Indemnity | Fixed maturities	'	'
Fair value by pricing source	'	'
Available-for-sale securities	0	0
Fair value measurements on a recurring basis | Level 1 | Indemnity | Fixed maturities | Priced via pricing services	'	'
Fair value by pricing source	'	'
Available-for-sale securities	0	'
Fair value measurements on a recurring basis | Level 1 | Indemnity | Fixed maturities | Priced via market comparables/broker quotes	'	'
Fair value by pricing source	'	'
Available-for-sale securities	0	'
Fair value measurements on a recurring basis | Level 1 | Indemnity | Fixed maturities | Priced via internal modeling	'	'
Fair value by pricing source	'	'
Available-for-sale securities	0	'
Fair value measurements on a recurring basis | Level 1 | Indemnity | Nonredeemable preferred stock	'	'
Fair value by pricing source	'	'
Available-for-sale securities	2	4
Fair value measurements on a recurring basis | Level 1 | Indemnity | Nonredeemable preferred stock | Priced via pricing services	'	'
Fair value by pricing source	'	'
Available-for-sale securities	2	'
Fair value measurements on a recurring basis | Level 1 | Indemnity | Nonredeemable preferred stock | Priced via market comparables/broker quotes	'	'
Fair value by pricing source	'	'
Available-for-sale securities	0	'
Fair value measurements on a recurring basis | Level 1 | Indemnity | Nonredeemable preferred stock | Priced via internal modeling	'	'
Fair value by pricing source	'	'
Available-for-sale securities	0	'
Fair value measurements on a recurring basis | Level 1 | Indemnity | Common stock	'	'
Fair value by pricing source	'	'
Available-for-sale securities	25	26
Fair value measurements on a recurring basis | Level 1 | Indemnity | Common stock | Priced via pricing services	'	'
Fair value by pricing source	'	'
Available-for-sale securities	25	'
Fair value measurements on a recurring basis | Level 1 | Indemnity | Common stock | Priced via market comparables/broker quotes	'	'
Fair value by pricing source	'	'
Available-for-sale securities	0	'
Fair value measurements on a recurring basis | Level 1 | Indemnity | Common stock | Priced via internal modeling	'	'
Fair value by pricing source	'	'
Available-for-sale securities	0	'
Fair value measurements on a recurring basis | Level 1 | Indemnity | Real estate	'	'
Fair value by pricing source	'	'
Other investments	0	0
Fair value measurements on a recurring basis | Level 1 | Indemnity | Real estate | Priced via unobservable inputs	'	'
Fair value by pricing source	'	'
Other investments	0	'
Fair value measurements on a recurring basis | Level 1 | Exchange	'	'
Fair value by pricing source	'	'
Available-for-sale securities	468	513
Total	3,399	2,915
Fair value measurements on a recurring basis | Level 1 | Exchange | Fixed maturities	'	'
Fair value by pricing source	'	'
Available-for-sale securities	0	0
Fair value measurements on a recurring basis | Level 1 | Exchange | Fixed maturities | Priced via pricing services	'	'
Fair value by pricing source	'	'
Available-for-sale securities	0	'
Fair value measurements on a recurring basis | Level 1 | Exchange | Fixed maturities | Priced via market comparables/broker quotes	'	'
Fair value by pricing source	'	'
Available-for-sale securities	0	'
Fair value measurements on a recurring basis | Level 1 | Exchange | Fixed maturities | Priced via internal modeling	'	'
Fair value by pricing source	'	'
Available-for-sale securities	0	'
Fair value measurements on a recurring basis | Level 1 | Exchange | Nonredeemable preferred stock	'	'
Fair value by pricing source	'	'
Available-for-sale securities	230	199
Fair value measurements on a recurring basis | Level 1 | Exchange | Nonredeemable preferred stock | Priced via pricing services	'	'
Fair value by pricing source	'	'
Available-for-sale securities	230	'
Fair value measurements on a recurring basis | Level 1 | Exchange | Nonredeemable preferred stock | Priced via market comparables/broker quotes	'	'
Fair value by pricing source	'	'
Available-for-sale securities	0	'
Fair value measurements on a recurring basis | Level 1 | Exchange | Nonredeemable preferred stock | Priced via internal modeling	'	'
Fair value by pricing source	'	'
Available-for-sale securities	0	'
Fair value measurements on a recurring basis | Level 1 | Exchange | Common stock	'	'
Fair value by pricing source	'	'
Available-for-sale securities	238	314
Trading and available-for-sale securities	3,169	'
Fair value measurements on a recurring basis | Level 1 | Exchange | Common stock | Priced via pricing services	'	'
Fair value by pricing source	'	'
Trading and available-for-sale securities	3,169	'
Fair value measurements on a recurring basis | Level 1 | Exchange | Common stock | Priced via market comparables/broker quotes	'	'
Fair value by pricing source	'	'
Trading and available-for-sale securities	0	'
Fair value measurements on a recurring basis | Level 1 | Exchange | Common stock | Priced via internal modeling	'	'
Fair value by pricing source	'	'
Trading and available-for-sale securities	0	'
Fair value measurements on a recurring basis | Level 1 | Exchange | Real estate	'	'
Fair value by pricing source	'	'
Other investments	0	0
Fair value measurements on a recurring basis | Level 1 | Exchange | Real estate | Priced via unobservable inputs	'	'
Fair value by pricing source	'	'
Other investments	0	'
Fair value measurements on a recurring basis | Level 2	'	'
Fair value by pricing source	'	'
Total	8,785	8,553
Fair value measurements on a recurring basis | Level 2 | Indemnity	'	'
Fair value by pricing source	'	'
Available-for-sale securities	518	473
Total	518	473
Fair value measurements on a recurring basis | Level 2 | Indemnity | Fixed maturities	'	'
Fair value by pricing source	'	'
Available-for-sale securities	497	448
Fair value measurements on a recurring basis | Level 2 | Indemnity | Fixed maturities | Priced via pricing services	'	'
Fair value by pricing source	'	'
Available-for-sale securities	497	'
Fair value measurements on a recurring basis | Level 2 | Indemnity | Fixed maturities | Priced via market comparables/broker quotes	'	'
Fair value by pricing source	'	'
Available-for-sale securities	0	'
Fair value measurements on a recurring basis | Level 2 | Indemnity | Fixed maturities | Priced via internal modeling	'	'
Fair value by pricing source	'	'
Available-for-sale securities	0	'
Fair value measurements on a recurring basis | Level 2 | Indemnity | Nonredeemable preferred stock	'	'
Fair value by pricing source	'	'
Available-for-sale securities	21	25
Fair value measurements on a recurring basis | Level 2 | Indemnity | Nonredeemable preferred stock | Priced via pricing services	'	'
Fair value by pricing source	'	'
Available-for-sale securities	19	'
Fair value measurements on a recurring basis | Level 2 | Indemnity | Nonredeemable preferred stock | Priced via market comparables/broker quotes	'	'
Fair value by pricing source	'	'
Available-for-sale securities	2	'
Fair value measurements on a recurring basis | Level 2 | Indemnity | Nonredeemable preferred stock | Priced via internal modeling	'	'
Fair value by pricing source	'	'
Available-for-sale securities	0	'
Fair value measurements on a recurring basis | Level 2 | Indemnity | Common stock	'	'
Fair value by pricing source	'	'
Available-for-sale securities	0	0
Fair value measurements on a recurring basis | Level 2 | Indemnity | Common stock | Priced via pricing services	'	'
Fair value by pricing source	'	'
Available-for-sale securities	0	'
Fair value measurements on a recurring basis | Level 2 | Indemnity | Common stock | Priced via market comparables/broker quotes	'	'
Fair value by pricing source	'	'
Available-for-sale securities	0	'
Fair value measurements on a recurring basis | Level 2 | Indemnity | Common stock | Priced via internal modeling	'	'
Fair value by pricing source	'	'
Available-for-sale securities	0	'
Fair value measurements on a recurring basis | Level 2 | Indemnity | Real estate	'	'
Fair value by pricing source	'	'
Other investments	0	0
Fair value measurements on a recurring basis | Level 2 | Indemnity | Real estate | Priced via unobservable inputs	'	'
Fair value by pricing source	'	'
Other investments	0	'
Fair value measurements on a recurring basis | Level 2 | Exchange	'	'
Fair value by pricing source	'	'
Available-for-sale securities	8,267	8,080
Total	8,267	8,080
Fair value measurements on a recurring basis | Level 2 | Exchange | Fixed maturities	'	'
Fair value by pricing source	'	'
Available-for-sale securities	7,886	7,648
Fair value measurements on a recurring basis | Level 2 | Exchange | Fixed maturities | Priced via pricing services	'	'
Fair value by pricing source	'	'
Available-for-sale securities	7,836	'
Fair value measurements on a recurring basis | Level 2 | Exchange | Fixed maturities | Priced via market comparables/broker quotes	'	'
Fair value by pricing source	'	'
Available-for-sale securities	50	'
Fair value measurements on a recurring basis | Level 2 | Exchange | Fixed maturities | Priced via internal modeling	'	'
Fair value by pricing source	'	'
Available-for-sale securities	0	'
Fair value measurements on a recurring basis | Level 2 | Exchange | Nonredeemable preferred stock	'	'
Fair value by pricing source	'	'
Available-for-sale securities	381	432
Fair value measurements on a recurring basis | Level 2 | Exchange | Nonredeemable preferred stock | Priced via pricing services	'	'
Fair value by pricing source	'	'
Available-for-sale securities	367	'
Fair value measurements on a recurring basis | Level 2 | Exchange | Nonredeemable preferred stock | Priced via market comparables/broker quotes	'	'
Fair value by pricing source	'	'
Available-for-sale securities	14	'
Fair value measurements on a recurring basis | Level 2 | Exchange | Nonredeemable preferred stock | Priced via internal modeling	'	'
Fair value by pricing source	'	'
Available-for-sale securities	0	'
Fair value measurements on a recurring basis | Level 2 | Exchange | Common stock	'	'
Fair value by pricing source	'	'
Available-for-sale securities	0	0
Trading and available-for-sale securities	0	'
Fair value measurements on a recurring basis | Level 2 | Exchange | Common stock | Priced via pricing services	'	'
Fair value by pricing source	'	'
Trading and available-for-sale securities	0	'
Fair value measurements on a recurring basis | Level 2 | Exchange | Common stock | Priced via market comparables/broker quotes	'	'
Fair value by pricing source	'	'
Trading and available-for-sale securities	0	'
Fair value measurements on a recurring basis | Level 2 | Exchange | Common stock | Priced via internal modeling	'	'
Fair value by pricing source	'	'
Trading and available-for-sale securities	0	'
Fair value measurements on a recurring basis | Level 2 | Exchange | Real estate	'	'
Fair value by pricing source	'	'
Other investments	0	0
Fair value measurements on a recurring basis | Level 2 | Exchange | Real estate | Priced via unobservable inputs	'	'
Fair value by pricing source	'	'
Other investments	0	'
Fair value measurements on a recurring basis | Level 3	'	'
Fair value by pricing source	'	'
Total	170	206
Fair value measurements on a recurring basis | Level 3 | Indemnity	'	'
Fair value by pricing source	'	'
Available-for-sale securities	2	4
Total	21	23
Fair value measurements on a recurring basis | Level 3 | Indemnity | Fixed maturities	'	'
Fair value by pricing source	'	'
Available-for-sale securities	2	4
Fair value measurements on a recurring basis | Level 3 | Indemnity | Fixed maturities | Priced via pricing services	'	'
Fair value by pricing source	'	'
Available-for-sale securities	0	'
Fair value measurements on a recurring basis | Level 3 | Indemnity | Fixed maturities | Priced via market comparables/broker quotes	'	'
Fair value by pricing source	'	'
Available-for-sale securities	1	'
Fair value measurements on a recurring basis | Level 3 | Indemnity | Fixed maturities | Priced via internal modeling	'	'
Fair value by pricing source	'	'
Available-for-sale securities	1	'
Fair value measurements on a recurring basis | Level 3 | Indemnity | Nonredeemable preferred stock	'	'
Fair value by pricing source	'	'
Available-for-sale securities	0	0
Fair value measurements on a recurring basis | Level 3 | Indemnity | Nonredeemable preferred stock | Priced via pricing services	'	'
Fair value by pricing source	'	'
Available-for-sale securities	0	'
Fair value measurements on a recurring basis | Level 3 | Indemnity | Nonredeemable preferred stock | Priced via market comparables/broker quotes	'	'
Fair value by pricing source	'	'
Available-for-sale securities	0	'
Fair value measurements on a recurring basis | Level 3 | Indemnity | Nonredeemable preferred stock | Priced via internal modeling	'	'
Fair value by pricing source	'	'
Available-for-sale securities	0	'
Fair value measurements on a recurring basis | Level 3 | Indemnity | Common stock	'	'
Fair value by pricing source	'	'
Available-for-sale securities	0	0
Fair value measurements on a recurring basis | Level 3 | Indemnity | Common stock | Priced via pricing services	'	'
Fair value by pricing source	'	'
Available-for-sale securities	0	'
Fair value measurements on a recurring basis | Level 3 | Indemnity | Common stock | Priced via market comparables/broker quotes	'	'
Fair value by pricing source	'	'
Available-for-sale securities	0	'
Fair value measurements on a recurring basis | Level 3 | Indemnity | Common stock | Priced via internal modeling	'	'
Fair value by pricing source	'	'
Available-for-sale securities	0	'
Fair value measurements on a recurring basis | Level 3 | Indemnity | Real estate	'	'
Fair value by pricing source	'	'
Other investments	19	19
Fair value measurements on a recurring basis | Level 3 | Indemnity | Real estate | Priced via unobservable inputs	'	'
Fair value by pricing source	'	'
Other investments	19	'
Fair value measurements on a recurring basis | Level 3 | Exchange	'	'
Fair value by pricing source	'	'
Available-for-sale securities	35	59
Total	149	183
Fair value measurements on a recurring basis | Level 3 | Exchange | Fixed maturities	'	'
Fair value by pricing source	'	'
Available-for-sale securities	35	59
Fair value measurements on a recurring basis | Level 3 | Exchange | Fixed maturities | Priced via pricing services	'	'
Fair value by pricing source	'	'
Available-for-sale securities	0	'
Fair value measurements on a recurring basis | Level 3 | Exchange | Fixed maturities | Priced via market comparables/broker quotes	'	'
Fair value by pricing source	'	'
Available-for-sale securities	21	'
Fair value measurements on a recurring basis | Level 3 | Exchange | Fixed maturities | Priced via internal modeling	'	'
Fair value by pricing source	'	'
Available-for-sale securities	14	'
Fair value measurements on a recurring basis | Level 3 | Exchange | Nonredeemable preferred stock	'	'
Fair value by pricing source	'	'
Available-for-sale securities	0	0
Fair value measurements on a recurring basis | Level 3 | Exchange | Nonredeemable preferred stock | Priced via pricing services	'	'
Fair value by pricing source	'	'
Available-for-sale securities	0	'
Fair value measurements on a recurring basis | Level 3 | Exchange | Nonredeemable preferred stock | Priced via market comparables/broker quotes	'	'
Fair value by pricing source	'	'
Available-for-sale securities	0	'
Fair value measurements on a recurring basis | Level 3 | Exchange | Nonredeemable preferred stock | Priced via internal modeling	'	'
Fair value by pricing source	'	'
Available-for-sale securities	0	'
Fair value measurements on a recurring basis | Level 3 | Exchange | Common stock	'	'
Fair value by pricing source	'	'
Available-for-sale securities	0	0
Trading and available-for-sale securities	14	'
Fair value measurements on a recurring basis | Level 3 | Exchange | Common stock | Priced via pricing services	'	'
Fair value by pricing source	'	'
Trading and available-for-sale securities	0	'
Fair value measurements on a recurring basis | Level 3 | Exchange | Common stock | Priced via market comparables/broker quotes	'	'
Fair value by pricing source	'	'
Trading and available-for-sale securities	0	'
Fair value measurements on a recurring basis | Level 3 | Exchange | Common stock | Priced via internal modeling	'	'
Fair value by pricing source	'	'
Trading and available-for-sale securities	14	'
Fair value measurements on a recurring basis | Level 3 | Exchange | Real estate	'	'
Fair value by pricing source	'	'
Other investments	100	109
Fair value measurements on a recurring basis | Level 3 | Exchange | Real estate | Priced via unobservable inputs	'	'
Fair value by pricing source	'	'
Other investments	100	'
Fair value measurements on a nonrecurring basis	'	'
Fair value by pricing source	'	'
Total	$0	'

Investments_Details

Investments (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Available-for-sale securities	'	'
Amortized cost	$8,889	$8,378
Gross unrealized gains	509	790
Gross unrealized losses	81	9
Estimated fair value, fixed maturities	8,420	8,159
Estimated fair value, equity securities	897	1,000
Estimated fair value	9,317	9,159
Indemnity	'	'
Available-for-sale securities	'	'
Amortized cost, fixed maturities	491	437
Amortized cost, equity securities	48	54
Amortized cost	539	491
Gross unrealized gains	11	17
Gross unrealized losses	3	1
Estimated fair value, fixed maturities	499	452
Estimated fair value, equity securities	48	55
Estimated fair value	547	507
Indemnity | Fixed maturities	'	'
Available-for-sale securities	'	'
Amortized cost, fixed maturities	491	437
Gross unrealized gains	10	15
Gross unrealized losses	2	0
Estimated fair value, fixed maturities	499	452
Indemnity | States & political subdivisions	'	'
Available-for-sale securities	'	'
Amortized cost, fixed maturities	212	172
Gross unrealized gains	8	13
Gross unrealized losses	1	0
Estimated fair value, fixed maturities	219	185
Indemnity | Corporate debt securities	'	'
Available-for-sale securities	'	'
Amortized cost, fixed maturities	278	259
Gross unrealized gains	2	2
Gross unrealized losses	1	0
Estimated fair value, fixed maturities	279	261
Indemnity | Commercial mortgage-backed securities	'	'
Available-for-sale securities	'	'
Amortized cost, fixed maturities	'	3
Gross unrealized gains	'	0
Gross unrealized losses	'	0
Estimated fair value, fixed maturities	'	3
Indemnity | Collateralized debt obligations	'	'
Available-for-sale securities	'	'
Amortized cost, fixed maturities	1	3
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Estimated fair value, fixed maturities	1	3
Indemnity | Nonredeemable preferred stock	'	'
Available-for-sale securities	'	'
Amortized cost, equity securities	22	28
Gross unrealized gains	1	2
Gross unrealized losses	0	1
Estimated fair value, equity securities	23	29
Indemnity | Common stock	'	'
Available-for-sale securities	'	'
Amortized cost, equity securities	26	26
Gross unrealized gains	0	0
Gross unrealized losses	1	0
Estimated fair value, equity securities	25	26
Exchange	'	'
Available-for-sale securities	'	'
Amortized cost, fixed maturities	7,541	7,016
Amortized cost, equity securities	809	871
Amortized cost	8,350	7,887
Gross unrealized gains	498	773
Gross unrealized losses	78	8
Estimated fair value, fixed maturities	7,921	7,707
Estimated fair value, equity securities	849	945
Estimated fair value	8,770	8,652
Exchange | Fixed maturities	'	'
Available-for-sale securities	'	'
Amortized cost, fixed maturities	7,541	7,016
Gross unrealized gains	445	696
Gross unrealized losses	65	5
Estimated fair value, fixed maturities	7,921	7,707
Exchange | U.S. government & agencies	'	'
Available-for-sale securities	'	'
Amortized cost, fixed maturities	173	190
Gross unrealized gains	2	2
Gross unrealized losses	2	1
Estimated fair value, fixed maturities	173	191
Exchange | States & political subdivisions	'	'
Available-for-sale securities	'	'
Amortized cost, fixed maturities	1,383	1,218
Gross unrealized gains	60	103
Gross unrealized losses	12	0
Estimated fair value, fixed maturities	1,431	1,321
Exchange | Foreign government securities	'	'
Available-for-sale securities	'	'
Amortized cost, fixed maturities	15	15
Gross unrealized gains	0	1
Gross unrealized losses	0	0
Estimated fair value, fixed maturities	15	16
Exchange | Corporate debt securities	'	'
Available-for-sale securities	'	'
Amortized cost, fixed maturities	5,647	5,211
Gross unrealized gains	367	569
Gross unrealized losses	45	3
Estimated fair value, fixed maturities	5,969	5,777
Exchange | Residential mortgage-backed securities	'	'
Available-for-sale securities	'	'
Amortized cost, fixed maturities	200	226
Gross unrealized gains	4	6
Gross unrealized losses	5	1
Estimated fair value, fixed maturities	199	231
Exchange | Commercial mortgage-backed securities	'	'
Available-for-sale securities	'	'
Amortized cost, fixed maturities	46	62
Gross unrealized gains	2	5
Gross unrealized losses	0	0
Estimated fair value, fixed maturities	48	67
Exchange | Collateralized debt obligations	'	'
Available-for-sale securities	'	'
Amortized cost, fixed maturities	13	43
Gross unrealized gains	7	6
Gross unrealized losses	0	0
Estimated fair value, fixed maturities	20	49
Exchange | Other debt securities	'	'
Available-for-sale securities	'	'
Amortized cost, fixed maturities	64	51
Gross unrealized gains	3	4
Gross unrealized losses	1	0
Estimated fair value, fixed maturities	66	55
Exchange | Nonredeemable preferred stock	'	'
Available-for-sale securities	'	'
Amortized cost, equity securities	568	555
Gross unrealized gains	53	77
Gross unrealized losses	10	1
Estimated fair value, equity securities	611	631
Exchange | Common stock	'	'
Available-for-sale securities	'	'
Amortized cost, equity securities	241	316
Gross unrealized gains	0	0
Gross unrealized losses	3	2
Estimated fair value, equity securities	$238	$314

Investments_Details_2

Investments (Details 2) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Amortized cost	'	'
Total fixed maturities	$8,032	'
Estimated fair value	'	'
Total fixed maturities	8,420	8,159
Indemnity	'	'
Amortized cost	'	'
Due in one year or less	106	'
Due after one year through five years	239	'
Due after five years through ten years	71	'
Due after ten years	75	'
Total fixed maturities	491	'
Estimated fair value	'	'
Due in one year or less	106	'
Due after one year through five years	242	'
Due after five years through ten years	73	'
Due after ten years	78	'
Total fixed maturities	499	452
Exchange	'	'
Amortized cost	'	'
Due in one year or less	476	'
Due after one year through five years	2,681	'
Due after five years through ten years	2,781	'
Due after ten years	1,603	'
Total fixed maturities	7,541	'
Estimated fair value	'	'
Due in one year or less	484	'
Due after one year through five years	2,862	'
Due after five years through ten years	2,927	'
Due after ten years	1,648	'
Total fixed maturities	$7,921	$7,707

Investments_Details_3

Investments (Details 3) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified	Holdings	Holdings
Indemnity	'	'
Fair value	'	'
Less than 12 months	$124	$92
12 months or longer	16	6
Total	140	98
Unrealized losses	'	'
Less than 12 months	3	0
12 months or longer	0	1
Total	3	1
No. of holdings	31	19
Indemnity | Investment grade	'	'
Fair value	'	'
Less than 12 months	96	55
12 months or longer	10	3
Total	106	58
Unrealized losses	'	'
Less than 12 months	2	0
12 months or longer	0	0
Total	2	0
No. of holdings	25	12
Indemnity | Non-investment grade	'	'
Fair value	'	'
Less than 12 months	0	4
12 months or longer	0	0
Total	0	4
Unrealized losses	'	'
Less than 12 months	0	0
12 months or longer	0	0
Total	0	0
No. of holdings	0	1
Indemnity | Fixed maturities	'	'
Fair value	'	'
Less than 12 months	96	59
12 months or longer	10	3
Total	106	62
Unrealized losses	'	'
Less than 12 months	2	0
12 months or longer	0	0
Total	2	0
No. of holdings	25	13
Indemnity | States & political subdivisions	'	'
Fair value	'	'
Less than 12 months	23	'
12 months or longer	0	'
Total	23	'
Unrealized losses	'	'
Less than 12 months	1	'
12 months or longer	0	'
Total	1	'
No. of holdings	10	'
Indemnity | Corporate debt securities	'	'
Fair value	'	'
Less than 12 months	73	59
12 months or longer	10	0
Total	83	59
Unrealized losses	'	'
Less than 12 months	1	0
12 months or longer	0	0
Total	1	0
No. of holdings	15	12
Indemnity | Commercial mortgage-backed securities	'	'
Fair value	'	'
Less than 12 months	'	0
12 months or longer	'	3
Total	'	3
Unrealized losses	'	'
Less than 12 months	'	0
12 months or longer	'	0
Total	'	0
No. of holdings	'	1
Indemnity | Nonredeemable preferred stock	'	'
Fair value	'	'
Less than 12 months	3	7
12 months or longer	6	3
Total	9	10
Unrealized losses	'	'
Less than 12 months	0	0
12 months or longer	0	1
Total	0	1
No. of holdings	4	4
Indemnity | Common stock	'	'
Fair value	'	'
Less than 12 months	25	26
12 months or longer	0	0
Total	25	26
Unrealized losses	'	'
Less than 12 months	1	0
12 months or longer	0	0
Total	1	0
No. of holdings	2	2
Exchange	'	'
Fair value	'	'
Less than 12 months	2,056	694
12 months or longer	35	48
Total	2,091	742
Unrealized losses	'	'
Less than 12 months	75	7
12 months or longer	3	1
Total	78	8
No. of holdings	335	77
Exchange | Investment grade	'	'
Fair value	'	'
Less than 12 months	1,561	296
12 months or longer	19	24
Total	1,580	320
Unrealized losses	'	'
Less than 12 months	58	4
12 months or longer	2	0
Total	60	4
No. of holdings	289	53
Exchange | Non-investment grade	'	'
Fair value	'	'
Less than 12 months	92	20
12 months or longer	1	6
Total	93	26
Unrealized losses	'	'
Less than 12 months	5	1
12 months or longer	0	0
Total	5	1
No. of holdings	19	8
Exchange | Fixed maturities	'	'
Fair value	'	'
Less than 12 months	1,653	316
12 months or longer	20	30
Total	1,673	346
Unrealized losses	'	'
Less than 12 months	63	5
12 months or longer	2	0
Total	65	5
No. of holdings	308	61
Exchange | U.S. government & agencies	'	'
Fair value	'	'
Less than 12 months	104	80
12 months or longer	0	0
Total	104	80
Unrealized losses	'	'
Less than 12 months	2	1
12 months or longer	0	0
Total	2	1
No. of holdings	7	7
Exchange | States & political subdivisions	'	'
Fair value	'	'
Less than 12 months	309	23
12 months or longer	0	0
Total	309	23
Unrealized losses	'	'
Less than 12 months	12	0
12 months or longer	0	0
Total	12	0
No. of holdings	77	11
Exchange | Foreign government securities	'	'
Fair value	'	'
Less than 12 months	5	'
12 months or longer	0	'
Total	5	'
Unrealized losses	'	'
Less than 12 months	0	'
12 months or longer	0	'
Total	0	'
No. of holdings	1	'
Exchange | Corporate debt securities	'	'
Fair value	'	'
Less than 12 months	1,116	152
12 months or longer	6	9
Total	1,122	161
Unrealized losses	'	'
Less than 12 months	44	3
12 months or longer	1	0
Total	45	3
No. of holdings	199	31
Exchange | Residential mortgage-backed securities	'	'
Fair value	'	'
Less than 12 months	87	56
12 months or longer	14	0
Total	101	56
Unrealized losses	'	'
Less than 12 months	4	1
12 months or longer	1	0
Total	5	1
No. of holdings	18	9
Exchange | Collateralized debt obligations	'	'
Fair value	'	'
Less than 12 months	'	0
12 months or longer	'	21
Total	'	21
Unrealized losses	'	'
Less than 12 months	'	0
12 months or longer	'	0
Total	'	0
No. of holdings	'	1
Exchange | Other debt securities	'	'
Fair value	'	'
Less than 12 months	32	5
12 months or longer	0	0
Total	32	5
Unrealized losses	'	'
Less than 12 months	1	0
12 months or longer	0	0
Total	1	0
No. of holdings	6	2
Exchange | Nonredeemable preferred stock	'	'
Fair value	'	'
Less than 12 months	165	64
12 months or longer	15	18
Total	180	82
Unrealized losses	'	'
Less than 12 months	9	0
12 months or longer	1	1
Total	10	1
No. of holdings	24	13
Exchange | Common stock	'	'
Fair value	'	'
Less than 12 months	238	314
12 months or longer	0	0
Total	238	314
Unrealized losses	'	'
Less than 12 months	3	2
12 months or longer	0	0
Total	$3	$2
No. of holdings	3	3

Investments_Details_4

Investments (Details 4) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Investment income from portfolios	'	'	'	'
Investment income, net of expenses	$109	$105	$316	$326
Indemnity	'	'	'	'
Investment income from portfolios	'	'	'	'
Total investment income	4	5	12	13
Less: investment expenses	0	1	1	1
Investment income, net of expenses	4	4	11	12
Indemnity | Fixed maturities	'	'	'	'
Investment income from portfolios	'	'	'	'
Total investment income	3	4	9	10
Indemnity | Equity securities	'	'	'	'
Investment income from portfolios	'	'	'	'
Total investment income	1	0	2	2
Indemnity | Cash equivalents and other	'	'	'	'
Investment income from portfolios	'	'	'	'
Total investment income	0	1	1	1
Exchange	'	'	'	'
Investment income from portfolios	'	'	'	'
Total investment income	113	110	330	340
Less: investment expenses	8	9	25	26
Investment income, net of expenses	105	101	305	314
Exchange | Fixed maturities	'	'	'	'
Investment income from portfolios	'	'	'	'
Total investment income	83	87	249	266
Exchange | Equity securities	'	'	'	'
Investment income from portfolios	'	'	'	'
Total investment income	29	23	80	72
Exchange | Cash equivalents and other	'	'	'	'
Investment income from portfolios	'	'	'	'
Total investment income	$1	$0	$1	$2

Investments_Details_5

Investments (Details 5) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Realized gains (losses) on investments	'	'	'	'
Net realized investment gains (losses)	$191	$169	$501	$358
Other-than-temporary impairments on investments	'	'	'	'
Net impairment losses recognized in earnings	9	0	10	0
Indemnity	'	'	'	'
Realized gains (losses) on investments	'	'	'	'
Net realized investment gains (losses)	1	2	1	4
Other-than-temporary impairments on investments	'	'	'	'
Other -than-temporary impairments on investments	0	0	0	0
Portion recognized in other comprehensive income	0	0	0	0
Net impairment losses recognized in earnings	0	0	0	0
Indemnity | Fixed maturities	'	'	'	'
Available-for-sale securities:	'	'	'	'
Gross realized gains	1	0	1	0
Gross realized losses	0	0	0	0
Net realized gains (losses)	1	0	1	0
Other-than-temporary impairments on investments	'	'	'	'
Other -than-temporary impairments on investments	0	0	0	0
Indemnity | Equity securities	'	'	'	'
Available-for-sale securities:	'	'	'	'
Gross realized gains	0	0	0	0
Gross realized losses	0	0	0	0
Net realized gains (losses)	0	0	0	0
Other-than-temporary impairments on investments	'	'	'	'
Other -than-temporary impairments on investments	0	0	0	0
Indemnity | Common stock	'	'	'	'
Trading securities:	'	'	'	'
Gross realized gains	0	0	0	1
Gross realized losses	0	0	0	0
Increases in fair value(1)	0	2	0	3
Net realized gains (losses) gains	0	2	0	4
Exchange	'	'	'	'
Realized gains (losses) on investments	'	'	'	'
Net realized investment gains (losses)	190	167	500	354
Other-than-temporary impairments on investments	'	'	'	'
Other -than-temporary impairments on investments	9	0	10	0
Portion recognized in other comprehensive income	0	0	0	0
Net impairment losses recognized in earnings	9	0	10	0
Exchange | Fixed maturities	'	'	'	'
Available-for-sale securities:	'	'	'	'
Gross realized gains	4	22	26	47
Gross realized losses	-20	-6	-25	-12
Net realized gains (losses)	-16	16	1	35
Other-than-temporary impairments on investments	'	'	'	'
Other -than-temporary impairments on investments	1	0	2	0
Exchange | Equity securities	'	'	'	'
Available-for-sale securities:	'	'	'	'
Gross realized gains	0	5	4	10
Gross realized losses	-9	-5	-9	-7
Net realized gains (losses)	-9	0	-5	3
Other-than-temporary impairments on investments	'	'	'	'
Other -than-temporary impairments on investments	8	0	8	0
Exchange | Common stock	'	'	'	'
Trading securities:	'	'	'	'
Gross realized gains	90	37	246	122
Gross realized losses	-8	-24	-23	-57
Increases in fair value(1)	133	138	281	251
Net realized gains (losses) gains	$215	$151	$504	$316

Investments_Details_6

Investments (Details 6) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Investment in limited partnerships	'	'
Asset recorded	$1,137,000,000	$1,217,000,000
Income (loss) recognized due to valuation adjustments by the partnerships	-24,000,000	32,000,000
Income (loss) recorded	136,000,000	99,000,000
Per the limited partner financial statements	'	'
Total partnership assets	49,000,000,000	53,000,000,000
Total partnership liabilities	5,000,000,000	6,000,000,000
Total partnership valuation adjustment gains (losses)	1,000,000,000	2,000,000,000
Total partnership net income	5,000,000,000	5,000,000,000
Indemnity	'	'
Investment in limited partnerships	'	'
Number of partnerships	62	62
Asset recorded	158,000,000	180,000,000
Income (loss) recognized due to valuation adjustments by the partnerships	-2,000,000	5,000,000
Income (loss) recorded	15,000,000	10,000,000
Indemnity | Private equity	'	'
Investment in limited partnerships	'	'
Number of partnerships	29	29
Asset recorded	65,000,000	73,000,000
Income (loss) recognized due to valuation adjustments by the partnerships	-5,000,000	1,000,000
Income (loss) recorded	7,000,000	6,000,000
Indemnity | Private equity | Less than 10%	'	'
Investment in limited partnerships	'	'
Number of partnerships	26	26
Asset recorded	51,000,000	60,000,000
Income (loss) recognized due to valuation adjustments by the partnerships	-7,000,000	-3,000,000
Income (loss) recorded	7,000,000	6,000,000
Indemnity | Private equity | Greater than or equal to 10% but less than 50%	'	'
Investment in limited partnerships	'	'
Number of partnerships	3	3
Asset recorded	14,000,000	13,000,000
Income (loss) recognized due to valuation adjustments by the partnerships	2,000,000	4,000,000
Income (loss) recorded	0	0
Indemnity | Private equity | Greater than 50%	'	'
Investment in limited partnerships	'	'
Number of partnerships	0	0
Asset recorded	0	0
Income (loss) recognized due to valuation adjustments by the partnerships	0	0
Income (loss) recorded	0	0
Indemnity | Mezzanine debt	'	'
Investment in limited partnerships	'	'
Number of partnerships	15	15
Asset recorded	22,000,000	27,000,000
Income (loss) recognized due to valuation adjustments by the partnerships	0	-1,000,000
Income (loss) recorded	3,000,000	6,000,000
Indemnity | Mezzanine debt | Less than 10%	'	'
Investment in limited partnerships	'	'
Number of partnerships	11	11
Asset recorded	15,000,000	18,000,000
Income (loss) recognized due to valuation adjustments by the partnerships	0	-2,000,000
Income (loss) recorded	1,000,000	5,000,000
Indemnity | Mezzanine debt | Greater than or equal to 10% but less than 50%	'	'
Investment in limited partnerships	'	'
Number of partnerships	3	3
Asset recorded	7,000,000	9,000,000
Income (loss) recognized due to valuation adjustments by the partnerships	0	0
Income (loss) recorded	2,000,000	2,000,000
Indemnity | Mezzanine debt | Greater than 50%	'	'
Investment in limited partnerships	'	'
Number of partnerships	1	1
Asset recorded	0	0
Income (loss) recognized due to valuation adjustments by the partnerships	0	1,000,000
Income (loss) recorded	0	-1,000,000
Indemnity | Real estate	'	'
Investment in limited partnerships	'	'
Number of partnerships	18	18
Asset recorded	71,000,000	80,000,000
Income (loss) recognized due to valuation adjustments by the partnerships	3,000,000	5,000,000
Income (loss) recorded	5,000,000	-2,000,000
Indemnity | Real estate | Less than 10%	'	'
Investment in limited partnerships	'	'
Number of partnerships	12	12
Asset recorded	47,000,000	55,000,000
Income (loss) recognized due to valuation adjustments by the partnerships	1,000,000	4,000,000
Income (loss) recorded	3,000,000	-3,000,000
Indemnity | Real estate | Greater than or equal to 10% but less than 50%	'	'
Investment in limited partnerships	'	'
Number of partnerships	3	3
Asset recorded	15,000,000	16,000,000
Income (loss) recognized due to valuation adjustments by the partnerships	1,000,000	-1,000,000
Income (loss) recorded	2,000,000	1,000,000
Indemnity | Real estate | Greater than 50%	'	'
Investment in limited partnerships	'	'
Number of partnerships	3	3
Asset recorded	9,000,000	9,000,000
Income (loss) recognized due to valuation adjustments by the partnerships	1,000,000	2,000,000
Income (loss) recorded	0	0
Exchange	'	'
Investment in limited partnerships	'	'
Number of partnerships	103	100
Asset recorded	979,000,000	1,037,000,000
Income (loss) recognized due to valuation adjustments by the partnerships	-22,000,000	27,000,000
Income (loss) recorded	121,000,000	89,000,000
Exchange | Private equity	'	'
Investment in limited partnerships	'	'
Number of partnerships	46	45
Asset recorded	477,000,000	482,000,000
Income (loss) recognized due to valuation adjustments by the partnerships	-18,000,000	38,000,000
Income (loss) recorded	64,000,000	23,000,000
Exchange | Private equity | Less than 10%	'	'
Investment in limited partnerships	'	'
Number of partnerships	43	42
Asset recorded	414,000,000	424,000,000
Income (loss) recognized due to valuation adjustments by the partnerships	-29,000,000	22,000,000
Income (loss) recorded	65,000,000	24,000,000
Exchange | Private equity | Greater than or equal to 10% but less than 50%	'	'
Investment in limited partnerships	'	'
Number of partnerships	3	3
Asset recorded	63,000,000	58,000,000
Income (loss) recognized due to valuation adjustments by the partnerships	11,000,000	16,000,000
Income (loss) recorded	-1,000,000	-1,000,000
Exchange | Private equity | Greater than 50%	'	'
Investment in limited partnerships	'	'
Number of partnerships	0	0
Asset recorded	0	0
Income (loss) recognized due to valuation adjustments by the partnerships	0	0
Income (loss) recorded	0	0
Exchange | Mezzanine debt	'	'
Investment in limited partnerships	'	'
Number of partnerships	26	25
Asset recorded	178,000,000	196,000,000
Income (loss) recognized due to valuation adjustments by the partnerships	1,000,000	-6,000,000
Income (loss) recorded	18,000,000	38,000,000
Exchange | Mezzanine debt | Less than 10%	'	'
Investment in limited partnerships	'	'
Number of partnerships	19	18
Asset recorded	121,000,000	132,000,000
Income (loss) recognized due to valuation adjustments by the partnerships	1,000,000	-5,000,000
Income (loss) recorded	11,000,000	29,000,000
Exchange | Mezzanine debt | Greater than or equal to 10% but less than 50%	'	'
Investment in limited partnerships	'	'
Number of partnerships	4	4
Asset recorded	23,000,000	27,000,000
Income (loss) recognized due to valuation adjustments by the partnerships	-1,000,000	1,000,000
Income (loss) recorded	5,000,000	4,000,000
Exchange | Mezzanine debt | Greater than 50%	'	'
Investment in limited partnerships	'	'
Number of partnerships	3	3
Asset recorded	34,000,000	37,000,000
Income (loss) recognized due to valuation adjustments by the partnerships	1,000,000	-2,000,000
Income (loss) recorded	2,000,000	5,000,000
Exchange | Real estate	'	'
Investment in limited partnerships	'	'
Number of partnerships	31	30
Asset recorded	324,000,000	359,000,000
Income (loss) recognized due to valuation adjustments by the partnerships	-5,000,000	-5,000,000
Income (loss) recorded	39,000,000	28,000,000
Exchange | Real estate | Less than 10%	'	'
Investment in limited partnerships	'	'
Number of partnerships	22	22
Asset recorded	216,000,000	274,000,000
Income (loss) recognized due to valuation adjustments by the partnerships	-5,000,000	-7,000,000
Income (loss) recorded	24,000,000	26,000,000
Exchange | Real estate | Greater than or equal to 10% but less than 50%	'	'
Investment in limited partnerships	'	'
Number of partnerships	6	5
Asset recorded	76,000,000	52,000,000
Income (loss) recognized due to valuation adjustments by the partnerships	2,000,000	-4,000,000
Income (loss) recorded	7,000,000	3,000,000
Exchange | Real estate | Greater than 50%	'	'
Investment in limited partnerships	'	'
Number of partnerships	3	3
Asset recorded	32,000,000	33,000,000
Income (loss) recognized due to valuation adjustments by the partnerships	-2,000,000	6,000,000
Income (loss) recorded	$8,000,000	($1,000,000)

Bank_Line_of_Credit_Details

Bank Line of Credit (Details) (Revolving line of credit, USD $)	1 Months Ended	9 Months Ended
In Millions, unless otherwise specified	Oct. 25, 2013	Sep. 30, 2013
Indemnity	'	'
Bank Line of Credit	'	'
Maximum borrowing capacity under the bank revolving line of credit	'	100
Maximum letter of credit sublimit under the bank revolving line of credit	'	25
Expiration date of the bank revolving line of credit	'	3-Nov-16
Available borrowing capacity under the bank revolving line of credit, due to outstanding letters of credit	'	98.2
Outstanding amount of letters of credit sublimit under the bank revolving line of credit	'	1.8
Available amount of letters of credit sublimit under the bank revolving line of credit	'	23.2
Borrowings outstanding under the bank revolving line of credit	'	0
Fair value of bonds pledged as collateral on the bank revolving line of credit	'	111
Exchange	'	'
Bank Line of Credit	'	'
Maximum borrowing capacity under the bank revolving line of credit	'	300
Maximum letter of credit sublimit under the bank revolving line of credit	'	25
Expiration date of the bank revolving line of credit	'	28-Oct-16
Available borrowing capacity under the bank revolving line of credit, due to outstanding letters of credit	'	298.9
Outstanding amount of letters of credit sublimit under the bank revolving line of credit	'	1.1
Available amount of letters of credit sublimit under the bank revolving line of credit	'	23.9
Borrowings outstanding under the bank revolving line of credit	'	0
Fair value of bonds pledged as collateral on the bank revolving line of credit	'	332
Subsequent event | Indemnity	'	'
Bank Line of Credit	'	'
Expiration date of the bank revolving line of credit	3-Nov-18	'
Subsequent event description	'	'On OctoberB 25, 2013, Indemnity amended its revolving credit facility to extend the maturity date to NovemberB 3, 2018, lower the borrowing costs, and eliminate the minimum net worth financial covenant.
Subsequent event | Exchange	'	'
Bank Line of Credit	'	'
Expiration date of the bank revolving line of credit	25-Oct-18	'
Subsequent event description	'	'On OctoberB 25, 2013, the Exchange entered into a second amended and restated credit agreement to extend the maturity date to OctoberB 25, 2018, lower the borrowing costs, and eliminate the minimum statutory surplus covenant.

Income_Taxes_Details

Income Taxes (Details) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Income taxes	'	'
Net deferred tax liability, consolidated	$326	'
Net deferred income tax asset	42	37
Net deferred income tax liability	368	365
Deferred tax asset valuation allowance	0	'
Indemnity	'	'
Income taxes	'	'
Net deferred income tax asset	42	37
Net deferred income tax liability	0	0
Effective tax rate when investment related permanent tax differences are excluded (as a percent)	35.00%	'
Exchange	'	'
Income taxes	'	'
Net deferred income tax asset	0	0
Net deferred income tax liability	$368	$365
Effective tax rate when investment related permanent tax differences are excluded (as a percent)	35.00%	'
Minimum | Indemnity	'	'
Income taxes	'	'
Percent of total permanent tax differences related to investment revenues (as a percent)	98.00%	'
Minimum | Exchange	'	'
Income taxes	'	'
Percent of total permanent tax differences related to investment revenues (as a percent)	98.00%	'

Postretirement_Benefits_Detail

Postretirement Benefits (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Cost of pension plans	'	'	'	'
Service cost for benefits earned	$7	$5	$20	$16
Interest cost on benefits obligation	6	6	19	18
Expected return on plan assets	-8	-6	-23	-20
Prior service cost amortization	0	1	1	1
Net actuarial loss amortization	4	2	11	8
Pension plan cost	9	8	28	23
Erie Family Life Insurance Company (EFL)	'	'	'	'
Cost of pension plans	'	'	'	'
Contingent liability for amount of nonparticipating annuity contracts the employee pension plan purchased from EFL	$27	'	$27	'

Indemnity_Capital_Stock_Detail

Indemnity Capital Stock (Details) (Indemnity)	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Mar. 31, 2012	Sep. 30, 2013
Class A	'	'	'
Common Stock	'	'	'
Class A common stock shares issued upon conversion of Class B common stock shares (in shares)	4,800	4,800	'
Class B	'	'	'
Common Stock	'	'	'
Ratio for converting shares of Class B common stock into shares of Class A common stock (as a percent)	2400.00%	'	2400.00%
Class B common stock shares converted into Class A common stock shares (in shares)	2	2	0

Indemnity_Capital_Stock_Detail1

Indemnity Capital Stock (Details 2) (Indemnity, Class A, Stock repurchase program, USD $)	1 Months Ended	9 Months Ended
In Millions, unless otherwise specified	Oct. 31, 2011	Sep. 30, 2013
Indemnity | Class A | Stock repurchase program	'	'
Stock repurchases	'	'
Amount of authorized stock repurchases approved for continuation under the current program	$150	'
Approximate amount of repurchase authority remaining under the current stock repurchase program	'	$47

Indemnity_Accumulated_Other_Co2

Indemnity Accumulated Other Comprehensive Income (Loss) (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Changes in Indemnity's accumulated other comprehensive income (loss) by component attributable to the Indemnity shareholder interest	'	'	'	'	'
Other comprehensive (loss) income	($2)	$99	($221)	$183	$150
Indemnity	'	'	'	'	'
Changes in Indemnity's accumulated other comprehensive income (loss) by component attributable to the Indemnity shareholder interest	'	'	'	'	'
Balance, beginning of period	'	'	-133	'	'
Other comprehensive loss before reclassifications, net of tax	'	'	-8	'	'
Amounts reclassified from accumulated other comprehensive loss, net of tax	'	'	-1	'	'
Other comprehensive (loss) income	'	'	-7	'	-28
Balance, end of period	-140	'	-140	'	-133
Indemnity | Unrealized holding gains (losses) on available-for-sale securities	'	'	'	'	'
Changes in Indemnity's accumulated other comprehensive income (loss) by component attributable to the Indemnity shareholder interest	'	'	'	'	'
Balance, beginning of period	'	'	13	'	'
Other comprehensive loss before reclassifications, net of tax	'	'	-8	'	'
Amounts reclassified from accumulated other comprehensive loss, net of tax	'	'	-1	'	'
Other comprehensive (loss) income	'	'	-7	'	'
Balance, end of period	6	'	6	'	'
Indemnity | Postretirement Plans	'	'	'	'	'
Changes in Indemnity's accumulated other comprehensive income (loss) by component attributable to the Indemnity shareholder interest	'	'	'	'	'
Balance, beginning of period	'	'	-146	'	'
Other comprehensive loss before reclassifications, net of tax	'	'	0	'	'
Amounts reclassified from accumulated other comprehensive loss, net of tax	'	'	0	'	'
Other comprehensive (loss) income	'	'	0	'	'
Balance, end of period	($146)	'	($146)	'	'

Indemnity_Accumulated_Other_Co3

Indemnity Accumulated Other Comprehensive Income (Loss) (Details 2) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Amounts reclassified out of accumulated other comprehensive income (loss) and the related affected line item in the Consolidated Statements of Operations where net income is presented	'	'	'	'	'
Net realized investment gains (losses)	$191	$169	$501	$358	'
Net impairment losses recognized in earnings	-9	0	-10	0	'
Income (loss) from operations before income taxes and noncontrolling interest	398	270	1,097	734	'
Provision for income taxes	131	86	363	234	'
Net income (loss)	267	184	734	500	619
Less: Net loss attributable to noncontrolling interest in consolidated entity b Exchange	221	133	607	370	'
Net income attributable to Indemnity	46	51	127	130	'
Amounts reclassified from accumulated other comprehensive income (loss)	'	'	'	'	'
Amounts reclassified out of accumulated other comprehensive income (loss) and the related affected line item in the Consolidated Statements of Operations where net income is presented	'	'	'	'	'
Net income attributable to Indemnity	1	'	1	'	'
Unrealized holding gains (losses) on available-for-sale securities | Amounts reclassified from accumulated other comprehensive income (loss)	'	'	'	'	'
Amounts reclassified out of accumulated other comprehensive income (loss) and the related affected line item in the Consolidated Statements of Operations where net income is presented	'	'	'	'	'
Net realized investment gains (losses)	-24	'	-3	'	'
Net impairment losses recognized in earnings	-9	'	-10	'	'
Income (loss) from operations before income taxes and noncontrolling interest	-33	'	-13	'	'
Provision for income taxes	-12	'	-5	'	'
Net income (loss)	-21	'	-8	'	'
Less: Net loss attributable to noncontrolling interest in consolidated entity b Exchange	-22	'	-9	'	'
Net income attributable to Indemnity	1	'	1	'	'
Amortization of postretirement plan items | Amounts reclassified from accumulated other comprehensive income (loss)	'	'	'	'	'
Amounts reclassified out of accumulated other comprehensive income (loss) and the related affected line item in the Consolidated Statements of Operations where net income is presented	'	'	'	'	'
Net income attributable to Indemnity	$0	'	$0	'	'

Indemnity_Shareholders_Equity_2

Indemnity Shareholders' Equity and Noncontrolling Interest (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Reconciliation of the beginning and ending balances of shareholders' equity and noncontrolling interest	'	'	'	'	'
Balance, beginning of period	'	'	$6,791	$6,293	$6,293
Net income	267	184	734	500	619
Change in other comprehensive (loss) income, net of tax	-2	99	-221	183	150
Net purchase of treasury stock	'	'	-22	'	-69
Dividends declared:	'	'	'	'	'
Balance, end of period	7,199	'	7,199	'	6,791
Class A	'	'	'	'	'
Dividends declared:	'	'	'	'	'
Dividends declared	'	'	-82	'	-200
Class B	'	'	'	'	'
Dividends declared:	'	'	'	'	'
Dividends declared	'	'	-1	'	-2
Indemnity	'	'	'	'	'
Reconciliation of the beginning and ending balances of shareholders' equity and noncontrolling interest	'	'	'	'	'
Balance, beginning of period	'	'	642	781	781
Net income	'	'	127	'	160
Change in other comprehensive (loss) income, net of tax	'	'	-7	'	-28
Net purchase of treasury stock	'	'	-22	'	-69
Dividends declared:	'	'	'	'	'
Balance, end of period	657	'	657	'	642
Indemnity | Class A	'	'	'	'	'
Dividends declared:	'	'	'	'	'
Dividends declared (in dollars per share)	$0.59	$0.55	$1.78	$1.66	$4.25
Dividends declared	'	'	-82	'	-200
Indemnity | Class B	'	'	'	'	'
Dividends declared:	'	'	'	'	'
Dividends declared (in dollars per share)	$88.88	$82.88	$266.63	$248.63	$637.50
Dividends declared	'	'	-1	'	-2
Exchange	'	'	'	'	'
Reconciliation of the beginning and ending balances of shareholders' equity and noncontrolling interest	'	'	'	'	'
Balance, beginning of period	'	'	6,149	5,512	5,512
Net income	'	'	607	'	459
Change in other comprehensive (loss) income, net of tax	'	'	-214	'	178
Dividends declared:	'	'	'	'	'
Balance, end of period	$6,542	'	$6,542	'	$6,149

Commitments_and_Contingencies_

Commitments and Contingencies (Details) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013
Indemnity	'
Contractual commitments	'
Represents the entity's maximum contractual commitments to invest in its limited partnership investments	$30
Description of commitment: contractual commitment to invest in limited partnership investments	'Contractual commitments to invest in limited partnership investments, consisting of private equity securities, mezzanine debt securities, and real estate activities.
Indemnity | Private equity	'
Contractual commitments	'
Represents the entity's maximum contractual commitments to invest in its limited partnership investments	14
Indemnity | Mezzanine debt	'
Contractual commitments	'
Represents the entity's maximum contractual commitments to invest in its limited partnership investments	10
Indemnity | Real estate	'
Contractual commitments	'
Represents the entity's maximum contractual commitments to invest in its limited partnership investments	6
Exchange	'
Contractual commitments	'
Represents the entity's maximum contractual commitments to invest in its limited partnership investments	388
Description of commitment: contractual commitment to invest in limited partnership investments	'Contractual commitments to invest in limited partnership investments, consisting of private equity securities, mezzanine debt securities, and real estate activities.
Exchange | Private equity	'
Contractual commitments	'
Represents the entity's maximum contractual commitments to invest in its limited partnership investments	137
Exchange | Mezzanine debt	'
Contractual commitments	'
Represents the entity's maximum contractual commitments to invest in its limited partnership investments	164
Exchange | Real estate	'
Contractual commitments	'
Represents the entity's maximum contractual commitments to invest in its limited partnership investments	$87

Indemnity_Supplemental_Informa2

Indemnity Supplemental Information (Details) (USD $)

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Dec. 31, 2011

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Dec. 31, 2011

Sep. 30, 2013

Sep. 30, 2012

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Dec. 31, 2011

Sep. 30, 2013

Dec. 31, 2012

In Millions, unless otherwise specified

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Indemnity

Exchange

Exchange

Exchange

Reclassifications and eliminations

Reclassifications and eliminations

Erie Family Life Insurance Company (EFL)

Erie Family Life Insurance Company (EFL)

Erie Family Life Insurance Company (EFL)

Available-for-sale securities, at fair value:

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fixed maturities

$8,420

$8,159

'

'

$499

$452

'

'

'

'

'

$7,921

$7,707

'

'

'

Equity securities

897

1,000

'

'

48

55

'

'

'

'

'

849

945

'

'

'

Trading securities, at fair value

2,945

2,417

'

'

0

0

'

'

'

'

'

2,945

2,417

'

'

'

Limited partnerships

1,137

1,217

'

'

158

180

'

'

'

'

'

979

1,037

'

'

'

Other invested assets

21

21

'

'

1

1

'

'

'

'

'

20

20

'

'

'

Total investments

13,420

12,814

'

'

706

688

'

'

'

'

'

12,714

12,126

'

'

'

Cash and cash equivalents

535

400

404

185

33

12

12

11

'

'

'

502

388

'

'

'

Premiums receivable from policyholders

1,203

1,062

'

'

'

'

'

'

'

'

'

1,203

1,062

'

'

'

Reinsurance recoverable

174

168

'

'

'

'

'

'

'

'

'

174

168

'

'

'

Net deferred income tax asset

42

37

'

'

42

37

'

'

'

'

'

0

0

'

'

'

Deferred acquisition costs

574

504

'

'

'

'

'

'

'

'

'

574

504

'

'

'

Other assets

436

456

'

'

107

117

'

'

'

'

'

329

339

'

'

'

Receivables from the Exchange and other affiliates

'

'

'

'

320

281

'

'

3

'

3

'

'

'

-320

-281

Note receivable from EFL

'

'

'

'

25

25

'

'

25

'

'

'

'

'

-25

-25

Total assets

16,384

15,441

'

'

1,233

1,160

'

'

'

'

'

15,496

14,587

'

-345

-306

Liabilities

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Losses and loss expense reserves

3,712

3,598

'

'

'

'

'

'

'

'

'

3,712

3,598

'

'

'

Life policy and deposit contract reserves

1,754

1,708

'

'

'

'

'

'

'

'

'

1,754

1,708

'

'

'

Unearned premiums

2,654

2,365

'

'

'

'

'

'

'

'

'

2,654

2,365

'

'

'

Net deferred income tax liability

368

365

'

'

0

0

'

'

'

'

'

368

365

'

'

'

Other liabilities, adjusted for consolidation presentation

697

614

'

'

576

518

'

'

'

'

'

466

402

'

-345

-306

Total liabilities

9,185

8,650

'

'

576

518

'

'

'

'

'

8,954

8,438

'

-345

-306

Shareholders' equity and noncontrolling interest

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total Indemnity shareholders' equity

657

642

'

'

657

642

'

'

'

'

'

'

'

'

'

'

Noncontrolling interest in consolidated entity - Exchange

6,542

6,149

'

'

'

'

'

'

'

'

'

6,542

6,149

'

'

'

Total equity

7,199

6,791

'

6,293

657

642

'

781

'

'

'

6,542

6,149

5,512

'

'

Total liabilities, shareholders' equity and noncontrolling interest

16,384

15,441

'

'

1,233

1,160

'

'

'

'

'

15,496

14,587

'

-345

-306

Recievables from the Exchange

'

'

'

'

317

278

'

'

'

'

'

'

'

'

'

'

Note receivable from EFL, annual interest rate (as a percent)

'

'

'

'

'

'

'

'

6.70%

'

'

'

'

'

'

'

Note receivable from EFL, interest income recognized by Indemnity

'

'

'

'

'

'

'

'

$1.30

$1.30

'

'

'

'

'

'

Indemnity_Supplemental_Informa3

Indemnity Supplemental Information (Details 2) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Condensed financial statements	'	'	'	'
Service agreement revenue	$8	$8	$24	$24
Total revenues	1,577	1,460	4,574	4,140
Net investment income	109	105	316	326
Net realized gains on investments	191	169	501	358
Net impairment losses recognized in earnings	-9	0	-10	0
Equity in earnings of limited partnerships	37	41	112	99
Income (loss) from operations before income taxes and noncontrolling interest	398	270	1,097	734
Provision for income taxes	131	86	363	234
Net income attributable to Indemnity	46	51	127	130
Indemnity	'	'	'	'
Condensed financial statements	'	'	'	'
Net investment income	4	4	11	12
Net realized gains on investments	1	2	1	4
Net impairment losses recognized in earnings	0	0	0	0
Income (loss) from operations before income taxes and noncontrolling interest	70	78	193	197
Provision for income taxes	24	27	66	67
Net income attributable to Indemnity	46	51	127	130
Indemnity | Management operations	'	'	'	'
Condensed financial statements	'	'	'	'
Management fee revenue, net	333	305	965	882
Service agreement revenue	8	8	23	23
Total revenues	341	313	988	905
Cost of management operations	281	247	820	734
Income (loss) from operations before income taxes and noncontrolling interest	60	66	168	171
Indemnity | Investment operations	'	'	'	'
Condensed financial statements	'	'	'	'
Net investment income	4	4	11	12
Net realized gains on investments	1	2	1	4
Net impairment losses recognized in earnings	0	0	0	0
Equity in earnings of limited partnerships	5	6	13	10
Income (loss) from operations before income taxes and noncontrolling interest	$10	$12	$25	$26

Indemnity_Supplemental_Informa4

Indemnity Supplemental Information (Details 3) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Condensed financial statements	'	'
Service agreement fee received	$23	$23
Net investment income received	337	346
Limited partnership distributions	125	94
Commissions and bonuses paid to agents	-521	-470
Income taxes paid	-208	-246
Net cash provided by (used in) operating activities	689	365
Net cash provided by (used in) investing activities	-498	-34
Net cash provided by (used in) financing activities	-56	-112
Net increase (decrease) in cash and cash equivalents	135	219
Cash and cash equivalents at beginning of period	400	185
Cash and cash equivalents at end of period	535	404
Indemnity	'	'
Condensed financial statements	'	'
Management fee received	933	851
Service agreement fee received	23	23
Net investment income received	16	19
Limited partnership distributions	18	11
Decrease in reimbursements collected from affiliates	-8	-2
Commissions and bonuses paid to agents	-521	-470
Salaries and wages paid	-110	-99
Pension contribution and employee benefits paid	-33	-36
General operating expenses paid	-124	-99
Income taxes paid	-62	-54
Net cash provided by (used in) operating activities	132	144
Net cash provided by (used in) investing activities	-33	-8
Net cash provided by (used in) financing activities	-78	-135
Net increase (decrease) in cash and cash equivalents	21	1
Cash and cash equivalents at beginning of period	12	11
Cash and cash equivalents at end of period	$33	$12