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Fair Value Of Financial Instruments (Changes In Level 3 Assets And Liabilities Measured At Fair Value On Recurring Basis) (Detail) (USD $) In Millions, unless otherwise specified |  | 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 | 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 | 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 |  | 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 | 3 Months Ended | 9 Months Ended
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Sep. 30, 2012 Variable Interest Entity [Member] Loans Receivable [Member] | Sep. 30, 2012 Variable Interest Entity [Member] Loan Repurchase Commitments [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] Variable Interest Entity [Member] Loans Receivable [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] Variable Interest Entity [Member] Loans Receivable [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] Variable Interest Entity [Member] Loans Receivable [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] Variable Interest Entity [Member] Loans Receivable [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] Variable Interest Entity [Member] Loan Repurchase Commitments [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] Variable Interest Entity [Member] Loan Repurchase Commitments [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] Variable Interest Entity [Member] Loan Repurchase Commitments [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] Variable Interest Entity [Member] Loan Repurchase Commitments [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] Foreign Governments [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] Foreign Governments [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] Foreign Governments [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] Foreign Governments [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] Corporate Obligations [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] Corporate Obligations [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] Corporate Obligations [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] Corporate Obligations [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] Corporate Obligations [Member] Variable Interest Entity [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] Corporate Obligations [Member] Variable Interest Entity [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] Corporate Obligations [Member] Variable Interest Entity [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] Corporate Obligations [Member] Variable Interest Entity [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] Residential Mortgage-Backed Agency [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] Residential Mortgage-Backed Agency [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] Residential Mortgage-Backed Agency [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] Residential Mortgage-Backed Agency [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] Residential Mortgage-Backed Non-Agency [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] Residential Mortgage-Backed Non-Agency [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] Residential Mortgage-Backed Non-Agency [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] Residential Mortgage-Backed Non-Agency [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] Residential Mortgage-Backed Non-Agency [Member] Variable Interest Entity [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] Residential Mortgage-Backed Non-Agency [Member] Variable Interest Entity [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] Residential Mortgage-Backed Non-Agency [Member] Variable Interest Entity [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] Residential Mortgage-Backed Non-Agency [Member] Variable Interest Entity [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] Commercial Mortgage-Backed [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] Commercial Mortgage-Backed [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] Commercial Mortgage-Backed [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] Commercial Mortgage-Backed [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] Commercial Mortgage-Backed [Member] Variable Interest Entity [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] Commercial Mortgage-Backed [Member] Variable Interest Entity [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] Commercial Mortgage-Backed [Member] Variable Interest Entity [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] Commercial Mortgage-Backed [Member] Variable Interest Entity [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] Collateralized Debt Obligations [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] Collateralized Debt Obligations [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] Collateralized Debt Obligations [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] Collateralized Debt Obligations [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] Collateralized Debt Obligations [Member] Variable Interest Entity [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] Collateralized Debt Obligations [Member] Variable Interest Entity [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] Collateralized Debt Obligations [Member] Variable Interest Entity [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] Collateralized Debt Obligations [Member] Variable Interest Entity [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] Other Asset-Backed [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] Other Asset-Backed [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] Other Asset-Backed [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] Other Asset-Backed [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] Other Asset-Backed [Member] Variable Interest Entity [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] Other Asset-Backed [Member] Variable Interest Entity [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] Other Asset-Backed [Member] Variable Interest Entity [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] Other Asset-Backed [Member] Variable Interest Entity [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] State And Municipal Taxable Bonds [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] State And Municipal Taxable Bonds [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] State And Municipal Taxable Bonds [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] State And Municipal Taxable Bonds [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] State And Municipal Tax-Exempt Bonds [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] State And Municipal Tax-Exempt Bonds [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] State And Municipal Tax-Exempt Bonds [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] State And Municipal Tax-Exempt Bonds [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] Perpetual Preferred Securities [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] Perpetual Preferred Securities [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] Perpetual Preferred Securities [Member] | Jun. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] Perpetual Preferred Securities [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] Other Investments [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] Other Investments [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] Medium-Term Notes [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] Medium-Term Notes [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] Medium-Term Notes [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] Medium-Term Notes [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] Credit Derivatives [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] Credit Derivatives [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] Credit Derivatives [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] Credit Derivatives [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] Credit Derivatives [Member] Liabilities Of Consolidated VIEs [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] Credit Derivatives [Member] Liabilities Of Consolidated VIEs [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] Credit Derivatives [Member] Liabilities Of Consolidated VIEs [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] Interest Rate Derivatives [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] Interest Rate Derivatives [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] Interest Rate Derivatives [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] Interest Rate Derivatives [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] Currency Derivatives [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] Currency Derivatives [Member] Liabilities Of Consolidated VIEs [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] Currency Derivatives [Member] Liabilities Of Consolidated VIEs [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] Currency Derivatives [Member] Liabilities Of Consolidated VIEs [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] Currency Derivatives [Member] Liabilities Of Consolidated VIEs [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] Variable Interest Entity Notes [Member] Liabilities Of Consolidated VIEs [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] Variable Interest Entity Notes [Member] Liabilities Of Consolidated VIEs [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] Variable Interest Entity Notes [Member] Liabilities Of Consolidated VIEs [Member] | Sep. 30, 2011 Significant Unobservable Inputs (Level 3) [Member] Variable Interest Entity Notes [Member] Liabilities Of Consolidated VIEs [Member] | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] Interest Rate Derivative [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance, Fair Value Assets | $ 1,892 | $ 1,051 | $ 3,544 |  | $ 4,528 |  | $ 4,188 |  | $ 4,467 |  | $ 1,903 | $ 2,320 | $ 2,046 | $ 2,183 | $ 1,032 | $ 905 | $ 1,077 | $ 835 | $ 12 | $ 13 | $ 11 | $ 11 |  | $ 98 |  | $ 294 |  | $ 207 |  | $ 246 |  | $ 95 |  | $ 62 |  | $ 69 |  | $ 82 |  | $ 4 |  |  | $ 8 |  | $ 41 |  | $ 33 |  | $ 28 |  | $ 17 |  | $ 48 |  | $ 10 |  | $ 17 |  | $ 21 |  | $ 40 |  | $ 27 |  | $ 50 | $ 24 |  | $ 41 |  | $ 12 | $ 27 |  | $ 22 |  | $ 23 |  | $ 29 |  | $ 162 |  | $ 60 |  | $ 192 |  | $ 140 |  | $ 201 |  | $ 203 |  | $ 245 |  | $ 69 |  | $ 331 |  | $ 317 |  | $ 349 |  | $ 42 |  | $ 73 |  | $ 67 |  | $ 81 |  |  |  | $ 13 |  |  | $ 14 | $ 25 | $ 32 | $ 28 | $ 36 |  |  | $ 1 |  |  |  | $ 3 | $ 10 | $ 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized Gains / (Losses), Assets |  |  | (7) |  | (5) |  | (83) |  | (8) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1) |  | (15) |  | (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1) |  | (1) |  | (1) |  | (2) |  |  |  |  |  |  |  |  |  |  |  | (2) |  |  | (2) |  |  |  |  |  |  |  |  | (4) |  | (2) |  | (9) |  | (4) |  |  |  |  |  |  |  |  |  | (2) |  |  |  | (58) |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized Gains / (Losses) Included in Earnings, Assets |  |  | 70 |  | (18) |  | 29 |  | 311 |  | 61 | (36) | 52 | 260 | 19 | 33 | (26) | 91 |  |  |  |  |  | 4 |  |  |  | 9 |  |  |  | (10) |  | (5) |  | (15) |  | (18) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  | 6 |  | 2 |  |  |  |  |  |  |  |  | 1 | (1) |  | 3 |  | 6 |  |  |  |  |  |  |  |  |  | (5) |  | (17) |  | (5) |  | (27) |  |  |  |  |  |  |  |  |  | (1) |  | 5 |  | 4 |  | (3) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized Gains / (Losses) Included in OCI, Assets |  |  | 14 |  | (45) |  | 112 |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2) |  | (10) |  | 24 |  | (3) |  |  |  |  |  | (6) |  |  |  |  |  |  | 1 |  | 1 |  | 2 |  | 1 |  | (1) |  | 11 |  |  |  |  |  |  |  | 3 |  | 1 |  |  | 5 |  | 2 |  |  |  |  |  |  |  |  | 9 |  | (3) |  | 18 |  | 25 |  | 2 |  | (7) |  | (1) |  | (7) |  | 2 |  | (27) |  | 71 |  | (26) |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Exchange Recognized in OCI or Earnings, Assets |  |  | 1 |  | (7) |  | 1 |  | (3) |  |  |  |  |  |  |  |  |  | 1 | (2) | 1 | (1) |  |  |  | (5) |  |  |  | (2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchases, Assets |  |  | 13 |  | 126 |  | 78 |  | 182 |  |  |  |  |  |  |  |  |  | 9 | 3 | 22 | 9 |  | 2 |  | 19 |  | 18 |  | 30 |  |  |  |  |  | 28 |  |  |  |  |  | 1 |  |  | 2 |  |  |  | 4 |  |  |  | 15 |  |  |  |  |  |  |  |  |  | 1 |  |  | 1 |  | 8 |  |  |  |  |  |  |  |  |  |  | 39 |  |  |  | 46 |  |  |  | 60 |  |  |  | 60 |  | 1 |  |  |  | 5 |  | 10 |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuances, Assets |  |  |  |  | 2 |  |  |  | 15 |  |  |  |  |  |  |  |  | 12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlements, Assets |  |  | (117) |  | (216) |  | (314) |  | (486) |  | (72) | (66) | (204) | (223) |  |  |  |  | (10) | (3) | (19) | (8) |  | (13) |  | (32) |  | (29) |  | (65) |  | (2) |  | (1) |  | (5) |  | (5) |  | (1) |  |  | (1) |  | (1) |  | (5) |  | (4) |  | (11) |  | (14) |  | (1) |  | (1) |  | (5) |  | (6) |  |  |  | (3) |  |  | (3) |  |  |  |  | (3) |  | (2) |  | (4) |  | (79) |  | (12) |  | (112) |  | (1) |  | (1) |  | (1) |  | (3) |  | (1) |  | (9) |  | (11) |  | (20) |  | (5) |  |  |  | (8) |  | (2) |  |  |  | (15) |  |  | (15) | (2) | (2) | (5) | (7) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales, Assets |  |  |  |  | (123) |  | (540) |  | (170) |  |  |  | (2) | (2) |  |  |  |  |  |  | (3) |  |  |  |  | (38) |  | (140) |  | (50) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1) |  |  |  |  |  | (3) |  | (19) |  |  |  | (6) |  | (15) |  | (6) |  |  |  | (13) |  |  | (14) |  |  | (11) |  | (8) |  | (12) |  |  |  | (28) |  | (10) |  | (36) |  |  |  | (21) |  | (74) |  | (21) |  |  |  |  |  | (250) |  | (2) |  |  |  | (6) |  | (35) |  | (6) |  |  |  |  |  |  |  |  |  |  | (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transfers into Level 3, Assets |  |  | 163 | [1] | 144 | [1] | 265 | [1] | 349 | [1] |  |  |  |  |  |  |  |  |  |  |  | 7 | [1] | 10 | [1] | 115 | [1] | 25 | [1] | 202 | [1] | 3 | [1] | 7 | [1] | 15 | [1] | 11 | [1] |  |  |  | 4 | [1] |  |  | 1 | [1] | 1 | [1] | 31 | [1] | 9 | [1] | 2 | [1] | 2 | [1] | 5 | [1] | 2 | [1] | 1 | [1] |  | 1 | [1] |  |  |  | 2 | [1] | 5 | [1] | 2 | [1] | 4 | [1] | 1 | [1] | 14 | [1] | 49 | [1] | 37 | [1] | 12 | [1] | 51 | [1] | 48 | [1] | 4 | [1] | 3 | [1] | 5 | [1] | 16 | [1] | 30 | [1] |  |  | 34 | [1] | 2 | [1] | 71 | [1] |  | 71 | [1] |  |  |  |  |  | 1 | [1] | 4 | [1] | 1 | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transfers out of Level 3, Assets |  |  | (44) | [1] | (77) | [1] | (99) | [1] | (354) | [1] |  |  |  |  |  |  |  |  |  |  |  | (7) | [1] | (8) | [1] |  |  | (8) | [1] | (15) | [1] | (3) | [1] |  |  | (3) | [1] | (7) | [1] | (3) | [1] |  | (12) | [1] | (41) | [1] | (23) | [1] | (2) | [1] | (25) | [1] | (20) | [1] | (3) | [1] |  |  | (4) | [1] | (20) | [1] |  |  |  | (1) | [1] | (1) | [1] |  |  |  | (6) | [1] |  |  | (4) | [1] | (25) | [1] | (31) | [1] | (96) | [1] |  |  | (21) | [1] |  |  | (89) | [1] |  |  | (28) | [1] | (6) | [1] | (57) | [1] |  |  | (1) | [1] |  |  | (1) | [1] |  |  |  |  |  |  |  |  |  |  |  |  | (3) | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance, Fair Value Assets | 1,892 | 1,051 | 3,637 |  | 4,309 |  | 3,637 |  | 4,309 |  | 1,892 | 2,218 | 1,892 | 2,218 | 1,051 | 938 | 1,051 | 938 | 12 | 11 | 12 | 11 |  | 91 |  | 342 |  | 91 |  | 342 |  | 83 |  | 63 |  | 83 |  | 63 |  |  |  | 1 |  |  | 1 |  | 7 |  | 27 |  | 7 |  | 27 |  | 8 |  | 15 |  | 8 |  | 15 |  | 30 |  | 32 | 30 |  | 32 |  | 13 | 17 |  | 13 |  | 17 |  | 30 |  | 67 |  | 30 |  | 67 |  | 173 |  | 206 |  | 173 |  | 206 |  | 73 |  | 270 |  | 73 |  | 270 |  | 66 |  | 71 |  | 66 |  | 71 |  | 71 |  |  | 71 |  |  | 23 | 30 | 23 | 30 | 1 |  | 3 |  | 1 |  | 3 | 11 | 11 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets still held, Assets |  |  | 84 |  | (15) |  | 52 |  | 357 |  | 61 | (36) | 52 | 260 | 19 | 33 | (26) | 91 |  |  |  |  |  | 3 |  |  |  | 8 |  |  |  | 1 |  | (2) |  | 3 |  | (2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  | 3 |  | 2 |  |  |  |  |  |  |  |  | 1 | (2) |  | 2 |  | 3 |  |  |  |  |  |  |  |  |  | (2) |  | (14) |  | 5 |  | 1 |  |  |  |  |  |  |  |  |  | 1 |  | 5 |  | 5 |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance, Fair Value Liabilities |  |  | 5,320 |  | 11,308 |  | 7,938 |  | 9,916 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 151 |  | 206 |  | 165 |  | 116 |  | 3,285 |  | 5,657 |  | 4,790 |  | 4,350 |  | 920 |  | 80 |  | 768 |  | (4) |  | (4) |  | (3) |  | (5) |  |  |  | 21 |  | 16 |  | 17 |  | 14 |  | 1,867 |  | 4,513 |  | 2,889 |  | 4,673 |  |  |
Realized Gains / (Losses), Liabilities |  |  |  |  | 78 |  | 463 |  | 683 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 78 |  | 463 |  | 683 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized Gains / (Losses) Included in Earnings, Liabilities |  |  | 176 |  | (1,191) |  | (1,115) |  | 616 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14 |  | (69) |  | 3 |  | 9 |  | 32 |  | (777) |  | (1,473) |  | 530 |  | (154) |  | 2 |  | (3) |  |  |  | 1 |  | (1) |  | 1 |  |  |  | 2 |  | 2 |  | 6 |  | 4 |  | 128 |  | (194) |  | 348 |  | 75 |  |  |
Unrealized Gains / (Losses) Included in OCI, Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Exchange Recognized in OCI or Earnings, Liabilities |  |  | 3 |  | (9) |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  | (9) |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchases, Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuances, Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlements, Liabilities |  |  | (110) |  | (286) |  | (832) |  | (1,139) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (78) |  | (463) |  | (683) |  | (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (110) |  | (207) |  | (369) |  | (456) |  |  |
Sales, Liabilities |  |  |  |  | (981) |  | (1,065) |  | (1,161) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (82) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (981) |  | (983) |  | (1,161) |  |  |
Transfers into Level 3, Liabilities |  |  | 5 | [1] |  |  | 5 | [1] | 1 | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 | [1] |  |  | 4 | [1] | 1 | [1] | 1 | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 | [1]
Transfers out of Level 3, Liabilities |  |  |  | [1] |  | [1] |  | [1] |  | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | [1] |  | [1] |  | [1] |  | [1] |  | [1] |  | [1] |  | [1] |  | [1] |  | [1] |  | [1] |  | [1] |  | [1] |  | [1] |  | [1] |  | [1] |  | [1] |  | [1] |  | [1] |  | [1] |  | [1] |  | [1] |  | [1] |  | [1] |  | [1] |  | [1]
Ending Balance, Fair Value Liabilities |  |  | 5,394 |  | 8,919 |  | 5,394 |  | 8,919 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 168 |  | 128 |  | 168 |  | 128 |  | 3,317 |  | 4,880 |  | 3,317 |  | 4,880 |  | 765 |  |  |  | 765 |  |  |  | (3) |  |  |  | (3) |  | 1 |  | 23 |  | 18 |  | 23 |  | 18 |  | 1,885 |  | 3,131 |  | 1,885 |  | 3,131 |  | 1 |
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Liabilities still held, Liabilities |  |  | $ 182 |  | $ (798) |  | $ (224) |  | $ 2,251 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14 |  | $ (69) |  | $ 4 |  | $ 9 |  | $ 33 |  | $ (388) |  | $ (538) |  | $ 2,160 |  | $ (154) |  |  |  | $ (3) |  | $ 5 |  | $ 5 |  | $ 12 |  | $ 6 |  |  |  | $ 2 |  | $ 2 |  | $ 6 |  | $ 4 |  | $ 128 |  | $ (194) |  | $ 292 |  | $ 75 |  |  |
[1] | Transferred in and out at the end of the period.

X
- Definition Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis In Foreign Exchange Recognized Other Comprehensive Income or Earnings, Assets + References No definition available. + Details
Name: | mbi_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisInForeignExchangeRecognizedOtherComprehensiveIncomeOrEarningsAssets
Namespace Prefix: | mbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis In Foreign Exchange Recognized Other Comprehensive Income or Earnings, Liabilities + References No definition available. + Details
Name: | mbi_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisInForeignExchangeRecognizedOtherComprehensiveIncomeOrEarningsLiabilities
Namespace Prefix: | mbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition This item represents the amount of the total change in unrealized (holding) gains or losses for the period which are included in the statement of income (or changes in net assets) in trading revenues. Such unrealized (holding) gains or losses relate to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph d -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
Name: | us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInTradingRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition This item represents the amount of the total change in unrealized (holding) gains or losses for the period which are included in the statement of income (or changes in net assets) in trading revenue. Such unrealized (holding) gains or losses relate to those liabilities still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph d -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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