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Fair Value Of Financial Instruments (Changes In Level 3 Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Detail) (Fair Value Inputs Level 3 [Member], USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning balance, fair value assets | $ 2,295 |  | $ 3,362 |  | $ 2,352 |  | $ 3,532 |
Realized gains/(losses), assets | 0 |  | (7) |  | 1 |  | (9) |
Unrealized gains/(losses) included in earnings, assets | 14 |  | (17) |  | 30 |  | 337 |
Unrealized gains/(losses) included in OCI, assets | (4) |  | 9 |  | 27 |  | 31 |
Foreign exchange recognized in OCI or earnings, assets | (1) |  | 3 |  | (1) |  | 0 |
Purchases, assets | 3 |  | 0 |  | 25 |  | 65 |
Issuances, assets |  |  | 0 |  | 0 |  | 0 |
Settlements, assets | (80) |  | (106) |  | (241) |  | (403) |
Sales, assets | (1) |  | (6) |  | (68) |  | (373) |
Transfers into level 3, assets | 55 | [1] | 41 | [1] | 238 | [1] | 195 | [1]
Transfers out of level 3, assets | (1) | [1] | (34) | [1] | (83) | [1] | (130) | [1]
Ending balance, fair value assets | 2,280 |  | 3,245 |  | 2,280 |  | 3,245 |
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets | 14 |  | (12) |  | 59 |  | 347 |
Beginning balance, fair value liabilities | 1,395 |  | 2,676 |  | 2,301 |  | 5,039 |
Realized gains/(losses), liabilities | 24 |  | 28 |  | 418 |  | 1,548 |
Unrealized gains/(losses included in earnings, liabilities | (40) |  | (282) |  | (801) |  | (1,391) |
Unrealized gains/(losses) included in OCI, liabilities | 0 |  | 0 |  | 0 |  | 0 |
Foreign exchange recognized in OCI or earnings, liabilities | (18) |  | 6 |  | (19) |  | 4 |
Purchases, liabilities | 0 |  | 0 |  | 0 |  | 0 |
Issuances, liabilities | 0 |  | 0 |  | 3 |  | 0 |
Settlements, liabilities | (84) |  | (101) |  | (584) |  | (1,799) |
Sales, liabilities | 0 |  | 0 |  | (41) | [2] | (1,076) | [2]
Transfers into Level 3, liabilities | 0 | [1] | 0 | [1] | 0 | [1] | 4 | [1]
Transfers out of Level 3, liabilities | 0 | [1] | 0 | [1] | 0 | [1] | (2) | [1]
Ending balance, fair value liabilities | 1,277 |  | 2,327 |  | 1,277 |  | 2,327 |
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities | (24) |  | (290) |  | 60 |  | 366 |
Loans Receivable [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning balance, fair value assets | 1,539 |  | 1,790 |  | 1,612 |  | 1,881 |
Unrealized gains/(losses) included in earnings, assets | 12 |  | (12) |  | 48 |  | 208 |
Settlements, assets | (56) |  | (74) |  | (165) |  | (211) |
Sales, assets |  |  |  |  |  |  | (174) |
Ending balance, fair value assets | 1,495 |  | 1,704 |  | 1,495 |  | 1,704 |
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets | 12 |  | (12) |  | 48 |  | 194 |
Loan Repurchase Commitments [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning balance, fair value assets | 363 |  | 1,115 |  | 359 |  | 1,086 |
Unrealized gains/(losses) included in earnings, assets | 2 |  | 1 |  | 6 |  | 140 |
Settlements, assets |  |  |  |  |  |  | (110) |
Ending balance, fair value assets | 365 |  | 1,116 |  | 365 |  | 1,116 |
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets | 2 |  | 1 |  | 6 |  | 140 |
State and municipal bonds [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning balance, fair value assets | 57 |  | 63 |  | 19 |  | 103 |
Realized gains/(losses), assets |  |  |  |  |  |  | 2 |
Unrealized gains/(losses) included in OCI, assets |  |  |  |  | 1 |  | (1) |
Settlements, assets | (1) |  | (1) |  | (3) |  | (4) |
Sales, assets |  |  |  |  | (3) |  | (12) |
Transfers into level 3, assets | 2 |  |  |  | 46 | [1] | 42 | [1]
Transfers out of level 3, assets |  |  |  |  | (2) | [1] | (68) | [1]
Ending balance, fair value assets | 58 |  | 62 |  | 58 |  | 62 |
Foreign Government Debt [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning balance, fair value assets | 5 |  | 3 |  | 12 |  | 3 |
Settlements, assets | (6) |  | (3) |  | (15) |  | (11) |
Transfers into level 3, assets | 7 | [1] | 5 | [1] | 9 | [1] | 16 | [1]
Transfers out of level 3, assets |  |  |  |  |  |  | (3) | [1]
Ending balance, fair value assets | 6 |  | 5 |  | 6 |  | 5 |
Corporate Obligations [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning balance, fair value assets | 34 |  | 63 |  | 48 |  | 76 |
Realized gains/(losses), assets |  |  | (7) |  | 3 |  | (5) |
Unrealized gains/(losses) included in earnings, assets |  |  | 1 |  | 3 |  | 6 |
Unrealized gains/(losses) included in OCI, assets |  |  | 7 |  | (4) |  | 11 |
Foreign exchange recognized in OCI or earnings, assets | (1) |  | 2 |  | (1) |  |  |
Purchases, assets | 3 |  |  |  | 9 |  | 1 |
Settlements, assets | (1) |  | (14) |  | (3) |  | (14) |
Sales, assets | (1) |  | (6) |  | (23) |  | (29) |
Transfers into level 3, assets | 4 | [1] | 1 | [1] | 7 | [1] | 1 | [1]
Transfers out of level 3, assets |  |  |  |  | (1) | [1] |  |
Ending balance, fair value assets | 38 |  | 47 |  | 38 |  | 47 |
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets |  |  | 1 |  | 2 |  | 6 |
Corporate Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning balance, fair value assets | 62 |  | 48 |  | 48 |  | 78 |
Realized gains/(losses), assets |  |  | 0 |  |  |  | (4) |
Unrealized gains/(losses) included in earnings, assets |  |  |  |  |  |  | (7) |
Unrealized gains/(losses) included in OCI, assets |  |  |  |  |  |  | 6 |
Settlements, assets |  |  |  |  | (4) |  | (3) |
Sales, assets |  |  |  |  |  |  | (25) |
Transfers into level 3, assets | 7 |  |  |  | 25 | [1] | 3 | [1]
Ending balance, fair value assets | 69 |  | 48 |  | 69 |  | 48 |
Residential Mortgage Backed Agency [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning balance, fair value assets | 8 |  | 3 |  | 0 |  | 0 |
Settlements, assets | (8) |  |  |  | (8) |  |  |
Transfers into level 3, assets |  |  | 17 | [1] | 37 | [1] | 20 | [1]
Transfers out of level 3, assets |  |  | (3) | [1] | (29) | [1] | (3) | [1]
Ending balance, fair value assets | 0 |  | 17 |  | 0 |  | 17 |
Residential Mortgage Backed Non Agency [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning balance, fair value assets |  |  | 1 |  | 6 |  | 4 |
Unrealized gains/(losses) included in OCI, assets |  |  |  |  | (1) |  |  |
Settlements, assets |  |  |  |  |  |  | (3) |
Transfers out of level 3, assets |  |  | (1) | [1] | (5) | [1] | (1) | [1]
Ending balance, fair value assets | 0 |  | 0 |  | 0 |  | 0 |
Residential Mortgage Backed Non Agency [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning balance, fair value assets | 4 |  | 2 |  | 4 |  | 6 |
Realized gains/(losses), assets | 0 |  |  |  |  |  |  |
Unrealized gains/(losses) included in earnings, assets |  |  |  |  | (1) |  | 6 |
Settlements, assets |  |  |  |  | (1) |  | (7) |
Transfers into level 3, assets |  |  | 2 |  | 2 | [1] | 3 | [1]
Transfers out of level 3, assets |  |  |  |  |  |  | (4) | [1]
Ending balance, fair value assets | 4 |  | 4 |  | 4 |  | 4 |
Commercial Mortgage Backed Securities [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning balance, fair value assets | 1 |  | 13 |  | 14 |  | 28 |
Realized gains/(losses), assets | 0 |  |  |  |  |  |  |
Unrealized gains/(losses) included in OCI, assets |  |  |  |  |  |  | 4 |
Settlements, assets |  |  | (1) |  | (14) |  | (2) |
Sales, assets |  |  |  |  |  |  | (18) |
Transfers into level 3, assets |  |  | 2 |  | 2 | [1] | 3 | [1]
Transfers out of level 3, assets |  |  |  |  | (1) | [1] | (1) | [1]
Ending balance, fair value assets | 1 |  | 14 |  | 1 |  | 14 |
Commercial Mortgage Backed Securities [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning balance, fair value assets |  |  | 4 |  | 3 |  | 7 |
Unrealized gains/(losses) included in earnings, assets |  |  | (1) |  | (3) |  | (1) |
Settlements, assets |  |  | (1) |  |  |  |  |
Sales, assets |  |  |  |  |  |  | (24) |
Transfers into level 3, assets |  |  |  |  |  |  | 20 | [1]
Ending balance, fair value assets |  |  | 2 |  |  |  | 2 |
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets |  |  |  |  |  |  | 1 |
Collateralized Debt Obligations [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning balance, fair value assets | 95 |  | 85 |  | 82 |  | 31 |
Realized gains/(losses), assets |  |  |  |  | (2) |  | (2) |
Unrealized gains/(losses) included in earnings, assets |  |  |  |  | 1 |  |  |
Unrealized gains/(losses) included in OCI, assets |  |  | 7 |  | 27 |  | 11 |
Purchases, assets |  |  |  |  | 5 |  | 61 |
Settlements, assets | (3) |  | (3) |  | (9) |  | (14) |
Sales, assets |  |  |  |  | (41) |  | (5) |
Transfers into level 3, assets |  |  | 10 | [1] | 36 | [1] | 28 | [1]
Transfers out of level 3, assets |  |  | (11) | [1] | (7) | [1] | (22) | [1]
Ending balance, fair value assets | 92 |  | 88 |  | 92 |  | 88 |
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets |  |  |  |  |  |  | 1 |
Collateralized Debt Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning balance, fair value assets | 6 |  | 35 |  | 22 |  | 125 |
Realized gains/(losses), assets | 0 |  |  |  |  |  |  |
Unrealized gains/(losses) included in earnings, assets |  |  | 1 |  | (10) |  | (8) |
Unrealized gains/(losses) included in OCI, assets |  |  |  |  |  |  | 5 |
Settlements, assets |  |  | (4) |  | (4) |  | (5) |
Sales, assets |  |  |  |  |  |  | (84) |
Transfers into level 3, assets |  |  |  |  | 1 | [1] | 1 | [1]
Transfers out of level 3, assets |  |  | (12) |  | (3) | [1] | (14) | [1]
Ending balance, fair value assets | 6 |  | 20 |  | 6 |  | 20 |
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets |  |  | (1) |  | 1 |  | 2 |
Other Asset Backed [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning balance, fair value assets | 82 |  | 64 |  | 58 |  | 26 |
Unrealized gains/(losses) included in OCI, assets | (4) |  | (5) |  | 4 |  | (5) |
Purchases, assets |  |  |  |  | 11 |  | 3 |
Settlements, assets | (4) |  | (4) |  | (8) |  | (9) |
Sales, assets |  |  |  |  | (1) |  |  |
Transfers into level 3, assets | 21 | [1] | 3 | [1] | 51 | [1] | 47 | [1]
Transfers out of level 3, assets | (1) | [1] | (1) | [1] | (21) | [1] | (5) | [1]
Ending balance, fair value assets | 94 |  | 57 |  | 94 |  | 57 |
Other Asset Backed [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning balance, fair value assets | 26 |  | 63 |  | 54 |  | 64 |
Unrealized gains/(losses) included in earnings, assets |  |  | (7) |  | (16) |  | (7) |
Settlements, assets | (1) |  | (1) |  | (7) |  | (10) |
Sales, assets |  |  |  |  |  |  | (2) |
Transfers into level 3, assets | 14 |  | 1 | [1] | 18 | [1] | 11 | [1]
Transfers out of level 3, assets |  |  | (6) |  | (10) | [1] | (6) |
Ending balance, fair value assets | 39 |  | 50 |  | 39 |  | 50 |
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets |  |  | (1) |  |  |  | 3 |
Medium Term Notes [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning balance, fair value liabilities | 217 |  | 188 |  | 203 |  | 165 |
Unrealized gains/(losses included in earnings, liabilities | 2 |  | 9 |  | 17 |  | 34 |
Foreign exchange recognized in OCI or earnings, liabilities | (17) |  | 7 |  | (18) |  | 5 |
Ending balance, fair value liabilities | 202 |  | 204 |  | 202 |  | 204 |
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities | (15) |  | 17 |  | (1) |  | 39 |
Credit Derivatives [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning balance, fair value liabilities | 332 |  | 1,648 |  | 1,147 |  | 2,921 |
Realized gains/(losses), liabilities | 24 |  | 28 |  | 388 |  | 1,548 |
Unrealized gains/(losses included in earnings, liabilities | (48) |  | (285) |  | (863) |  | (1,562) |
Settlements, liabilities | (24) |  | (28) |  | (388) |  | (1,548) |
Transfers into Level 3, liabilities |  |  | 0 | [1] |  |  | 4 | [1]
Ending balance, fair value liabilities | 284 |  | 1,363 |  | 284 |  | 1,363 |
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities | (14) |  | (285) |  | 20 |  | 301 |
Interest Rate Derivatives [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning balance, fair value liabilities |  |  | 0 |  |  |  | (1) |
Unrealized gains/(losses included in earnings, liabilities |  |  | 0 |  |  |  | 2 |
Foreign exchange recognized in OCI or earnings, liabilities |  |  | 0 |  |  |  |  |
Transfers out of Level 3, liabilities |  |  | 0 | [1] |  |  | (1) | [1]
Ending balance, fair value liabilities |  |  | 0 |  |  |  | 0 |
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities |  |  | (15) |  |  |  | (21) |
Other Derivative Liabilities [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning balance, fair value liabilities | 33 |  |  |  | 0 |  |  |
Realized gains/(losses), liabilities |  |  |  |  | 30 |  |  |
Unrealized gains/(losses included in earnings, liabilities | 5 |  |  |  | 8 |  |  |
Ending balance, fair value liabilities | 38 |  |  |  | 38 |  |  |
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities | 5 |  |  |  | 8 |  |  |
Variable Interest Entity Notes [Member] | Liabilities Of Consolidated Vies [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning balance, fair value liabilities | 802 |  | 824 |  | 940 |  | 1,932 |
Unrealized gains/(losses included in earnings, liabilities | 4 |  | (6) |  | 40 |  | 140 |
Issuances, liabilities |  |  |  |  | 3 |  |  |
Settlements, liabilities | (60) |  | (73) |  | (196) |  | (251) |
Sales, liabilities |  |  | 0 |  | (41) |  | (1,076) |
Ending balance, fair value liabilities | 746 |  | 745 |  | 746 |  | 745 |
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities | 4 |  | (6) |  | 37 |  | 53 |
Currency Derivatives [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning balance, fair value liabilities |  |  | 0 |  |  |  | 1 |
Unrealized gains/(losses included in earnings, liabilities |  |  | 0 |  |  |  |  |
Foreign exchange recognized in OCI or earnings, liabilities |  |  | 0 |  |  |  |  |
Transfers out of Level 3, liabilities |  |  | 0 | [1] |  |  | (1) | [1]
Ending balance, fair value liabilities |  |  | 0 |  |  |  | 0 |
Currency Derivatives [Member] | Liabilities Of Consolidated Vies [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning balance, fair value liabilities | 11 |  | 16 |  | 11 |  | 21 |
Unrealized gains/(losses included in earnings, liabilities | (3) |  | 0 |  | (3) |  | (5) |
Foreign exchange recognized in OCI or earnings, liabilities | (1) |  | (1) |  | (1) |  | (1) |
Ending balance, fair value liabilities | 7 |  | 15 |  | 7 |  | 15 |
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities | (4) |  | (1) |  | (4) |  | (6) |
Perpetual Debt And Equity Securities [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning balance, fair value assets | 13 |  | 10 |  | 11 |  | 14 |
Realized gains/(losses), assets | 0 |  |  |  |  |  |  |
Unrealized gains/(losses) included in earnings, assets |  |  |  |  | 2 |  |  |
Foreign exchange recognized in OCI or earnings, assets |  |  | 1 |  |  |  |  |
Transfers into level 3, assets |  |  |  |  | 4 | [1] |  |
Transfers out of level 3, assets |  |  |  |  | (4) | [1] | (3) | [1]
Ending balance, fair value assets | 13 |  | 11 |  | 13 |  | 11 |
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets |  |  |  |  | $ 2 |  |  |
[1] | (1) - Transferred in and out at the end of the period.
[2] | Primarily relates to the deconsolidation of VIEs.

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
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- 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
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- Definition Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related 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=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related 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=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of financial instrument classified as a liability into level 3 of the fair value hierarchy. + 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 (c)(3) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of financial instrument classified as a liability out of level 3 of the fair value hierarchy. + 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 (c)(3) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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