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Loss And Loss Adjustment Expense Reserves (RMBS Recoveries) (Narrative) (Detail) (USD $) In Millions, unless otherwise specified | 6 Months Ended | 12 Months Ended |  |  |  | 6 Months Ended
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Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2013 Second Lien Residential Mortgage Backed Securities And Reserves [Member] | May 23, 2013 Rmbs And Heloc And Ces [Member] | Jun. 30, 2013 Second-Lien RMBS Ineligible Mortgage Loans [Member] | Jun. 30, 2013 Second-Lien RMBS Ineligible Mortgage Loans [Member] Minimum [Member] | Jun. 30, 2013 Second-Lien RMBS Ineligible Mortgage Loans [Member] Maximum [Member]
Loss And Loss Adjustment Expense Reserves [Line Items] |  |  |  |  |  |  |
Total Estimated Ineligible Loan Recoveries |  |  | $ 1,100 |  |  |  |
Insurance loss recoverable |  |  | 18 |  |  |  |
Loan repurchase commitments |  |  | 1,100 |  |  |  |
Federal statutory rate | 35.00% | 35.00% |  |  |  |  |
Estimated insurance recoveries, after income taxes | 736 | 2,300 |  |  |  |  |
Percentage of recognized estimated recoveries in relationship to consolidated total shareholder's equity | 24.00% | 73.00% |  |  |  |  |
Current risk-free rate associated with underlying transaction, range, minimum |  |  |  |  | 1.50% |  |
Current risk-free rate associated with underlying transaction, range, maximum |  |  |  |  | 2.50% |  |
Remaining weighted average contract period (in years) | 8 years 6 months 0 days | 8 years 8 months 12 days |  |  |  | 5 years 2 months 12 days | 9 years 7 months 6 days
ResCap settlement amount per term sheet |  |  |  | $ 796 |  |  |

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- Definition Current Risk Free Rate Associated With Underlying Transaction, Range, Minimum + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of amounts expected to be recovered under the terms of insurance contracts after income taxes. + References No definition available. + Details
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- Definition The fair value of financial instruments that represent the right of the Trust against the seller/servicer for loans that were not compliant with the representations and warranties of the loan underwriting. The Trust has the right to demand that the transferor replace ineligible loans with a compliant loan or repurchase the non-compliant loan. + References No definition available. + Details
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- Definition Percentage Of Recognized Estimated Recoveries In Relationship To Consolidated Total Shareholders Equity + References No definition available. + Details
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- Definition The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=6889476&loc=d3e330036-122817 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 47 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Carrying amount as of the balance sheet date of amounts expected to be recovered under the terms of insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 + Details
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- Definition Remaining weighted average contract period of financial guarantee insurance contracts, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 9 -Subparagraph (a)(5)(ii) -URI http://asc.fasb.org/extlink&oid=6933314&loc=SL5749324-161292 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 55 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=6933462&loc=SL5751133-161288 + Details
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