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Fair Value Of Financial Instruments (Changes In Level 3 Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $) In Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning Balance, Fair Value Assets | $ 4,528 |  | $ 5,270 |  | $ 4,467 |  | $ 1,627 |
Realized Gains / (Losses), Assets | (5) |  |  |  | (9) |  | (16) |
Unrealized Gains / (Losses) Included in Earnings, Assets | (18) |  | (234) |  | 311 |  | 60 |
Unrealized Gains / (Losses) Included in OCI, Assets | (45) |  | 39 |  | 6 |  | 153 |
Foreign Exchange Recognized in OCI or Earnings, Assets | (13) |  | 48 |  | (9) |  | 19 |
Purchases, Assets | 126 |  |  |  | 183 |  |  |
Issuances, Assets | 2 |  |  |  | 15 |  |  |
Settlements, Assets | (210) |  |  |  | 480 |  |  |
Sales, Assets | (123) |  |  |  | 170 |  |  |
Purchases, Issuances and Settlements, net, Assets |  |  | (669) |  |  |  | 2,599 |
Transfers into Level 3, Assets | 144 | [1] | (323) | [1] | 349 | [1] | 720 | [1]
Transfers out of Level 3, Assets | (77) | [1] | (126) | [1] | (354) | [1] | (511) | [1]
Ending Balance, Fair Value Assets | 4,309 |  | 4,651 |  | 4,309 |  | 4,651 |
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets Still Held, Assets | (15) |  | 2 |  | 357 |  | 79 |
Beginning Balance, Fair Value Liabilities | 11,307 |  | 9,924 |  | 9,916 |  | 3,900 |
Realized Gains / (Losses), Liabilities | 79 |  | (519) |  | 683 |  | (374) |
Unrealized Gains / (Losses) Included in Earnings, Liabilities | (1,191) |  | 1,283 |  | 616 |  | 2,109 |
Unrealized Gains / (Losses) Included in OCI, Liabilities |  |  |  |  |  |  |  |
Foreign Exchange Recognized in OCI or Earnings, Liabilities | (9) |  | 49 |  | 3 |  | 29 |
Purchases, Liabilities |  |  |  |  |  |  |  |
Issuances, Liabilities |  |  |  |  |  |  |  |
Settlements, Liabilities | (286) |  |  |  | 1,139 |  |  |
Sales, Liabilities | (981) |  |  |  | 1,161 |  |  |
Purchases, Issuances and Settlements, net, Liabilities |  |  | 134 |  |  |  | 5,207 |
Transfers into Level 3, Liabilities |  | [1] |  | [1] | 1 | [1] |  | [1]
Transfers out of Level 3, Liabilities |  | [1] |  | [1] |  | [1] |  | [1]
Ending Balance, Fair Value Liabilities | 8,919 |  | 10,871 |  | 8,919 |  | 10,871 |
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets still held, Liabilities | (798) |  | 546 |  | 2,251 |  | 1,235 |
Other-Fixed Maturity Investments [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning Balance, Fair Value Assets |  |  |  |  |  |  | 19 |
Purchases, Issuances and Settlements, net, Assets |  |  |  |  |  |  | (19) |
Variable Interest Entity, Primary Beneficiary [Member] | Loans Receivable [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning Balance, Fair Value Assets | 2,320 |  | 2,608 |  | 2,183 |  |  |
Realized Gains / (Losses), Assets |  |  |  |  |  |  |  |
Unrealized Gains / (Losses) Included in Earnings, Assets | (36) |  | (167) |  | 260 |  | 28 |
Foreign Exchange Recognized in OCI or Earnings, Assets |  |  | 42 |  |  |  | 21 |
Settlements, Assets | (66) |  |  |  | 223 |  |  |
Sales, Assets |  |  |  |  | 2 |  |  |
Purchases, Issuances and Settlements, net, Assets |  |  | (540) |  |  |  | 1,894 |
Ending Balance, Fair Value Assets | 2,218 |  | 1,943 |  | 2,218 |  | 1,943 |
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets Still Held, Assets | (36) |  |  |  | 260 |  |  |
Variable Interest Entity, Primary Beneficiary [Member] | Loan Repurchase Commitments [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning Balance, Fair Value Assets | 905 |  | 792 |  | 835 |  |  |
Realized Gains / (Losses), Assets |  |  |  |  |  |  |  |
Unrealized Gains / (Losses) Included in Earnings, Assets | 33 |  | 2 |  | 91 |  | 79 |
Issuances, Assets |  |  |  |  | 12 |  |  |
Purchases, Issuances and Settlements, net, Assets |  |  |  |  |  |  | 715 |
Ending Balance, Fair Value Assets | 938 |  | 794 |  | 938 |  | 794 |
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets Still Held, Assets | 33 |  | 2 |  | 91 |  | 79 |
U.S. Treasury And Government Agency [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning Balance, Fair Value Assets |  |  | 27 |  |  |  | 6 |
Realized Gains / (Losses), Assets |  |  |  |  |  |  |  |
Purchases, Issuances and Settlements, net, Assets |  |  |  |  |  |  | 21 |
Transfers out of Level 3, Assets |  |  | (27) | [1] |  |  | (27) | [1]
Foreign Governments [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning Balance, Fair Value Assets | 13 |  | 12 |  | 11 |  | 12 |
Realized Gains / (Losses), Assets |  |  |  |  |  |  |  |
Foreign Exchange Recognized in OCI or Earnings, Assets | (8) |  | 1 |  | (7) |  | 1 |
Purchases, Assets | 3 |  |  |  | 9 |  |  |
Settlements, Assets | 3 |  |  |  | 2 |  |  |
Purchases, Issuances and Settlements, net, Assets |  |  | 6 |  |  |  | 6 |
Transfers into Level 3, Assets |  |  |  |  | 7 | [1] |  |
Transfers out of Level 3, Assets |  |  |  |  | (7) | [1] |  |
Ending Balance, Fair Value Assets | 11 |  | 19 |  | 11 |  | 19 |
Variable Interest Entity, Primary Beneficiary [Member] | Corporate Obligations [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning Balance, Fair Value Assets | 62 |  | 129 |  | 82 |  |  |
Realized Gains / (Losses), Assets |  |  |  |  |  |  |  |
Unrealized Gains / (Losses) Included in Earnings, Assets | (5) |  |  |  | (18) |  | 76 |
Settlements, Assets | (1) |  |  |  | 5 |  |  |
Purchases, Issuances and Settlements, net, Assets |  |  | 7 |  |  |  | 68 |
Transfers into Level 3, Assets | 7 | [1] | (13) | [1] | 11 | [1] | 13 | [1]
Transfers out of Level 3, Assets |  |  |  |  | (7) | [1] | (8) | [1]
Ending Balance, Fair Value Assets | 63 |  | 149 |  | 63 |  | 149 |
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets Still Held, Assets | (2) |  |  |  | (2) |  |  |
Corporate Obligations [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning Balance, Fair Value Assets | 294 |  | 284 |  | 246 |  | 281 |
Realized Gains / (Losses), Assets | (1) |  |  |  | (2) |  | (1) |
Unrealized Gains / (Losses) Included in OCI, Assets | (10) |  |  |  | (3) |  | 31 |
Foreign Exchange Recognized in OCI or Earnings, Assets | (5) |  | 3 |  | (2) |  | (2) |
Purchases, Assets | 19 |  |  |  | 31 |  |  |
Settlements, Assets | (32) |  |  |  | 65 |  |  |
Sales, Assets | (38) |  |  |  | 50 |  |  |
Purchases, Issuances and Settlements, net, Assets |  |  | (101) |  |  |  | (142) |
Transfers into Level 3, Assets | 115 | [1] | (18) | [1] | 202 | [1] | 59 | [1]
Transfers out of Level 3, Assets |  |  | (60) | [1] | (15) | [1] | (82) | [1]
Ending Balance, Fair Value Assets | 342 |  | 144 |  | 342 |  | 144 |
Variable Interest Entity, Primary Beneficiary [Member] | Residential Mortgage-Backed Securities [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning Balance, Fair Value Assets |  |  |  |  | 40 |  | 166 |
Realized Gains / (Losses), Assets |  |  |  |  |  |  | (1) |
Unrealized Gains / (Losses) Included in Earnings, Assets |  |  |  |  | 2 |  | (253) |
Unrealized Gains / (Losses) Included in OCI, Assets |  |  |  |  | 3 |  | 3 |
Settlements, Assets |  |  |  |  | 6 |  |  |
Sales, Assets |  |  |  |  | 6 |  |  |
Purchases, Issuances and Settlements, net, Assets |  |  |  |  |  |  | (96) |
Transfers into Level 3, Assets |  |  |  |  | 2 | [1] | 311 | [1]
Transfers out of Level 3, Assets |  |  |  |  | (20) | [1] | (52) | [1]
Ending Balance, Fair Value Assets | 15 |  | 78 |  | 15 |  | 78 |
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets Still Held, Assets |  |  |  |  | 2 |  |  |
Residential Mortgage-Backed Securities [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning Balance, Fair Value Assets |  |  |  |  | 41 |  | 48 |
Realized Gains / (Losses), Assets |  |  |  |  |  |  |  |
Unrealized Gains / (Losses) Included in OCI, Assets |  |  |  |  | 1 |  | 2 |
Purchases, Assets | 1 |  |  |  | 2 |  |  |
Settlements, Assets |  |  |  |  | 1 |  |  |
Sales, Assets |  |  |  |  | 1 |  |  |
Purchases, Issuances and Settlements, net, Assets |  |  |  |  |  |  | (5) |
Transfers into Level 3, Assets |  |  | (41) | [1] |  |  | 41 | [1]
Transfers out of Level 3, Assets |  |  |  |  | (41) | [1] | (45) | [1]
Ending Balance, Fair Value Assets | 1 |  | 41 |  | 1 |  | 41 |
Variable Interest Entity, Primary Beneficiary [Member] | Residential Mortgage-Backed Non-Agency [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning Balance, Fair Value Assets | 17 |  | 53 |  |  |  |  |
Realized Gains / (Losses), Assets |  |  |  |  |  |  |  |
Unrealized Gains / (Losses) Included in Earnings, Assets | 3 |  |  |  |  |  |  |
Settlements, Assets | (1) |  |  |  |  |  |  |
Sales, Assets | (6) |  |  |  |  |  |  |
Purchases, Issuances and Settlements, net, Assets |  |  | (5) |  |  |  |  |
Transfers into Level 3, Assets | 2 | [1] | (30) | [1] |  |  |  |
Ending Balance, Fair Value Assets | 15 |  | 78 |  | 15 |  | 78 |
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets Still Held, Assets | 1 |  |  |  |  |  |  |
Residential Mortgage-Backed Non-Agency [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning Balance, Fair Value Assets | 28 |  | 30 |  | 48 |  | 64 |
Realized Gains / (Losses), Assets | (1) |  |  |  | (2) |  | (3) |
Unrealized Gains / (Losses) Included in OCI, Assets | 1 |  | 2 |  | 11 |  | 34 |
Foreign Exchange Recognized in OCI or Earnings, Assets |  |  |  |  | (1) |  |  |
Purchases, Assets | 2 |  |  |  | 13 |  |  |
Settlements, Assets | (4) |  |  |  | 14 |  |  |
Sales, Assets |  |  |  |  | 19 |  |  |
Purchases, Issuances and Settlements, net, Assets |  |  | (2) |  |  |  | (23) |
Transfers into Level 3, Assets | 1 | [1] | (50) | [1] | 9 | [1] | 53 | [1]
Transfers out of Level 3, Assets | (2) | [1] | (1) | [1] | (20) | [1] | (46) | [1]
Ending Balance, Fair Value Assets | 25 |  | 79 |  | 25 |  | 79 |
Variable Interest Entity, Primary Beneficiary [Member] | Commercial Mortgage-Backed [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning Balance, Fair Value Assets | 27 |  | 216 |  | 23 |  | 3 |
Realized Gains / (Losses), Assets |  |  |  |  |  |  |  |
Unrealized Gains / (Losses) Included in Earnings, Assets | (1) |  | 3 |  | 6 |  | 221 |
Settlements, Assets |  |  |  |  | 2 |  |  |
Sales, Assets | (11) |  |  |  | 12 |  |  |
Purchases, Issuances and Settlements, net, Assets |  |  | (20) |  |  |  | 33 |
Transfers into Level 3, Assets | 2 | [1] | (17) | [1] | 2 | [1] | 18 | [1]
Transfers out of Level 3, Assets |  |  |  |  |  |  | (59) | [1]
Ending Balance, Fair Value Assets | 17 |  | 216 |  | 17 |  | 216 |
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets Still Held, Assets | (2) |  |  |  | 3 |  |  |
Commercial Mortgage-Backed [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning Balance, Fair Value Assets | 50 |  | 14 |  | 41 |  | 20 |
Realized Gains / (Losses), Assets | (2) |  |  |  | (2) |  |  |
Unrealized Gains / (Losses) Included in OCI, Assets |  |  |  |  | 2 |  | 1 |
Foreign Exchange Recognized in OCI or Earnings, Assets |  |  | 2 |  | 1 |  | (1) |
Purchases, Assets |  |  |  |  | 8 |  |  |
Settlements, Assets | (3) |  |  |  | 3 |  |  |
Sales, Assets | (13) |  |  |  | 14 |  |  |
Purchases, Issuances and Settlements, net, Assets |  |  | (1) |  |  |  | (5) |
Transfers out of Level 3, Assets |  |  | (1) | [1] | (1) | [1] | (1) | [1]
Ending Balance, Fair Value Assets | 32 |  | 14 |  | 32 |  | 14 |
Variable Interest Entity, Primary Beneficiary [Member] | Collateralized Debt Obligations [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning Balance, Fair Value Assets | 201 |  | 327 |  | 245 |  | 42 |
Realized Gains / (Losses), Assets |  |  |  |  |  |  |  |
Unrealized Gains / (Losses) Included in Earnings, Assets | (17) |  | (53) |  | (27) |  | (80) |
Unrealized Gains / (Losses) Included in OCI, Assets | (7) |  |  |  | (7) |  |  |
Purchases, Assets | 60 |  |  |  | 60 |  |  |
Settlements, Assets | (1) |  |  |  | 3 |  |  |
Sales, Assets | (21) |  |  |  | 21 |  |  |
Purchases, Issuances and Settlements, net, Assets |  |  | 37 |  |  |  | 321 |
Transfers into Level 3, Assets | 12 | [1] | (34) | [1] | 48 | [1] | 74 | [1]
Transfers out of Level 3, Assets | (21) | [1] |  |  | (89) | [1] | (12) | [1]
Ending Balance, Fair Value Assets | 206 |  | 345 |  | 206 |  | 345 |
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets Still Held, Assets | (14) |  |  |  | 1 |  |  |
Collateralized Debt Obligations [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning Balance, Fair Value Assets | 162 |  | 111 |  | 191 |  | 245 |
Realized Gains / (Losses), Assets | (2) |  |  |  | (4) |  | (12) |
Unrealized Gains / (Losses) Included in OCI, Assets | (3) |  | 5 |  | 25 |  | 65 |
Purchases, Assets | 39 |  |  |  | 47 |  |  |
Issuances, Assets | 2 |  |  |  | 3 |  |  |
Settlements, Assets | (79) |  |  |  | 112 |  |  |
Sales, Assets | (28) |  |  |  | 36 |  |  |
Purchases, Issuances and Settlements, net, Assets |  |  | (13) |  |  |  | (89) |
Transfers into Level 3, Assets | 1 | [1] | (100) | [1] | 49 | [1] | 116 | [1]
Transfers out of Level 3, Assets | (25) | [1] | (2) | [1] | (96) | [1] | (124) | [1]
Ending Balance, Fair Value Assets | 67 |  | 201 |  | 67 |  | 201 |
Variable Interest Entity, Primary Beneficiary [Member] | Other Asset-Backed [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning Balance, Fair Value Assets | 73 |  | 153 |  | 81 |  | 193 |
Realized Gains / (Losses), Assets |  |  |  |  |  |  |  |
Unrealized Gains / (Losses) Included in Earnings, Assets | 5 |  | (19) |  | (3) |  | (11) |
Settlements, Assets |  |  |  |  | 2 |  |  |
Sales, Assets | (6) |  |  |  | 6 |  |  |
Purchases, Issuances and Settlements, net, Assets |  |  | (4) |  |  |  | (51) |
Transfers into Level 3, Assets |  |  | (16) | [1] | 2 | [1] | 18 | [1]
Transfers out of Level 3, Assets | (1) | [1] | (26) | [1] | (1) | [1] | (29) | [1]
Ending Balance, Fair Value Assets | 71 |  | 120 |  | 71 |  | 120 |
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets Still Held, Assets | 5 |  |  |  | 2 |  |  |
Other Asset-Backed [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning Balance, Fair Value Assets | 331 |  | 391 |  | 350 |  | 401 |
Realized Gains / (Losses), Assets |  |  |  |  |  |  |  |
Unrealized Gains / (Losses) Included in OCI, Assets | (27) |  | 32 |  | (26) |  | 7 |
Purchases, Assets | 2 |  |  |  | 11 |  |  |
Settlements, Assets | (9) |  |  |  | 20 |  |  |
Sales, Assets |  |  |  |  | 2 |  |  |
Purchases, Issuances and Settlements, net, Assets |  |  | (31) |  |  |  | (12) |
Transfers into Level 3, Assets | 3 | [1] | (4) | [1] | 16 | [1] | 17 | [1]
Transfers out of Level 3, Assets | (28) | [1] | (9) | [1] | (57) | [1] | (26) | [1]
Ending Balance, Fair Value Assets | 272 |  | 387 |  | 272 |  | 387 |
State And Municipal Tax-Exempt Bonds [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning Balance, Fair Value Assets | 32 |  | 38 |  | 36 |  | 50 |
Realized Gains / (Losses), Assets |  |  |  |  |  |  | 1 |
Unrealized Gains / (Losses) Included in OCI, Assets |  |  |  |  |  |  | 1 |
Purchases, Assets |  |  |  |  | 2 |  |  |
Settlements, Assets | (2) |  |  |  | 7 |  |  |
Sales, Assets |  |  |  |  | 1 |  |  |
Purchases, Issuances and Settlements, net, Assets |  |  | (2) |  |  |  | (16) |
Ending Balance, Fair Value Assets | 30 |  | 36 |  | 30 |  | 36 |
State And Municipal Taxable Bonds [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning Balance, Fair Value Assets | 13 |  |  |  | 14 |  |  |
Realized Gains / (Losses), Assets | 1 |  |  |  | 1 |  |  |
Unrealized Gains / (Losses) Included in OCI, Assets | 1 |  |  |  |  |  |  |
Settlements, Assets | (15) |  |  |  | 15 |  |  |
Perpetual Preferred Securities [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning Balance, Fair Value Assets |  |  | 85 |  |  |  | 77 |
Realized Gains / (Losses), Assets |  |  |  |  |  |  |  |
Unrealized Gains / (Losses) Included in OCI, Assets |  |  |  |  |  |  | 9 |
Purchases, Issuances and Settlements, net, Assets |  |  |  |  |  |  | (1) |
Transfers into Level 3, Assets | 1 | [1] |  |  | 1 | [1] |  |
Ending Balance, Fair Value Assets | 1 |  | 85 |  | 1 |  | 85 |
Liabilities Of Consolidated VIEs [Member] | Credit Derivatives [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning Balance, Fair Value Liabilities | 920 |  |  |  | 768 |  |  |
Unrealized Gains / (Losses) Included in Earnings, Liabilities | (154) |  |  |  | (3) |  |  |
Unrealized Gains / (Losses) Included in OCI, Liabilities |  |  |  |  |  |  |  |
Purchases, Liabilities |  |  |  |  |  |  |  |
Issuances, Liabilities |  |  |  |  |  |  |  |
Settlements, Liabilities | (1) |  |  |  |  |  |  |
Transfers into Level 3, Liabilities |  | [1] |  |  |  |  |  |
Transfers out of Level 3, Liabilities |  | [1] |  |  |  | [1] |  |
Ending Balance, Fair Value Liabilities | 765 |  |  |  | 765 |  |  |
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets still held, Liabilities | (154) |  |  |  | (3) |  |  |
Credit Derivatives [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning Balance, Fair Value Liabilities | 5,656 |  | 4,414 |  | 4,350 |  | 3,799 |
Realized Gains / (Losses), Liabilities | 79 |  | (519) |  | 683 |  | (366) |
Unrealized Gains / (Losses) Included in Earnings, Liabilities | (777) |  | 1,046 |  | 530 |  | 1,719 |
Unrealized Gains / (Losses) Included in OCI, Liabilities |  |  |  |  |  |  |  |
Purchases, Liabilities |  |  |  |  |  |  |  |
Issuances, Liabilities |  |  |  |  |  |  |  |
Settlements, Liabilities | (78) |  |  |  | 683 |  |  |
Purchases, Issuances and Settlements, net, Liabilities |  |  | 519 |  |  |  | 308 |
Transfers into Level 3, Liabilities |  | [1] |  | [1] |  |  |  | [1]
Transfers out of Level 3, Liabilities |  | [1] |  | [1] |  | [1] |  | [1]
Ending Balance, Fair Value Liabilities | 4,880 |  | 5,460 |  | 4,880 |  | 5,460 |
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets still held, Liabilities | (388) |  | 531 |  | 2,160 |  | 1,208 |
Interest Rate Derivatives [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning Balance, Fair Value Liabilities | (4) |  | (7) |  | (5) |  | (6) |
Realized Gains / (Losses), Liabilities |  |  |  |  |  |  | (8) |
Unrealized Gains / (Losses) Included in Earnings, Liabilities | 1 |  | 4 |  | 1 |  | 7 |
Unrealized Gains / (Losses) Included in OCI, Liabilities |  |  |  |  |  |  |  |
Foreign Exchange Recognized in OCI or Earnings, Liabilities |  |  | (4) |  |  |  |  |
Purchases, Liabilities |  |  |  |  |  |  |  |
Issuances, Liabilities |  |  |  |  |  |  |  |
Transfers into Level 3, Liabilities |  | [1] |  | [1] | 1 | [1] |  | [1]
Transfers out of Level 3, Liabilities |  | [1] |  | [1] |  | [1] |  | [1]
Ending Balance, Fair Value Liabilities | (3) |  | (7) |  | (3) |  | (7) |
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets still held, Liabilities | 5 |  | 17 |  | 6 |  | 23 |
Liabilities Of Consolidated VIEs [Member] | Currency Derivatives [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning Balance, Fair Value Liabilities | 16 |  |  |  | 14 |  |  |
Unrealized Gains / (Losses) Included in Earnings, Liabilities | 2 |  |  |  | 4 |  |  |
Unrealized Gains / (Losses) Included in OCI, Liabilities |  |  |  |  |  |  |  |
Purchases, Liabilities |  |  |  |  |  |  |  |
Issuances, Liabilities |  |  |  |  |  |  |  |
Transfers into Level 3, Liabilities |  | [1] |  |  |  |  |  |
Transfers out of Level 3, Liabilities |  | [1] |  |  |  | [1] |  |
Ending Balance, Fair Value Liabilities | 18 |  |  |  | 18 |  |  |
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets still held, Liabilities | 2 |  |  |  | 4 |  |  |
Currency Derivatives [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning Balance, Fair Value Liabilities |  |  | (7) |  |  |  | (3) |
Unrealized Gains / (Losses) Included in Earnings, Liabilities |  |  | (7) |  |  |  | (9) |
Unrealized Gains / (Losses) Included in OCI, Liabilities |  |  |  |  |  |  |  |
Foreign Exchange Recognized in OCI or Earnings, Liabilities |  |  | (2) |  |  |  | (4) |
Transfers into Level 3, Liabilities |  |  |  | [1] |  |  |  | [1]
Transfers out of Level 3, Liabilities |  |  |  | [1] |  |  |  | [1]
Ending Balance, Fair Value Liabilities |  |  | (16) |  |  |  | (16) |
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets still held, Liabilities |  |  | (10) |  |  |  | (22) |
Medium-Term Notes [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning Balance, Fair Value Liabilities | 206 |  | 109 |  | 116 |  | 110 |
Unrealized Gains / (Losses) Included in Earnings, Liabilities | (69) |  | (9) |  | 9 |  | 6 |
Unrealized Gains / (Losses) Included in OCI, Liabilities |  |  |  |  |  |  |  |
Foreign Exchange Recognized in OCI or Earnings, Liabilities | (9) |  | 10 |  | 3 |  | (6) |
Purchases, Liabilities |  |  |  |  |  |  |  |
Issuances, Liabilities |  |  |  |  |  |  |  |
Transfers into Level 3, Liabilities |  | [1] |  | [1] |  |  |  | [1]
Transfers out of Level 3, Liabilities |  | [1] |  | [1] |  | [1] |  | [1]
Ending Balance, Fair Value Liabilities | 128 |  | 110 |  | 128 |  | 110 |
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets still held, Liabilities | (69) |  | (9) |  | 9 |  | 6 |
Liabilities Of Consolidated VIEs [Member] | Variable Interest Entity Notes [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning Balance, Fair Value Liabilities | 4,513 |  | 5,045 |  | 4,673 |  |  |
Unrealized Gains / (Losses) Included in Earnings, Liabilities | (194) |  | 232 |  | 75 |  | 366 |
Unrealized Gains / (Losses) Included in OCI, Liabilities |  |  |  |  |  |  |  |
Foreign Exchange Recognized in OCI or Earnings, Liabilities |  |  | 45 |  |  |  | 39 |
Purchases, Liabilities |  |  |  |  |  |  |  |
Issuances, Liabilities |  |  |  |  |  |  |  |
Settlements, Liabilities | (207) |  |  |  | 456 |  |  |
Sales, Liabilities | (981) |  |  |  | 1,161 |  |  |
Purchases, Issuances and Settlements, net, Liabilities |  |  | (540) |  |  |  | 4,377 |
Transfers into Level 3, Liabilities |  | [1] |  | [1] |  |  |  | [1]
Transfers out of Level 3, Liabilities |  | [1] |  | [1] |  | [1] |  | [1]
Ending Balance, Fair Value Liabilities | 3,131 |  | 4,782 |  | 3,131 |  | 4,782 |
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets still held, Liabilities | (194) |  |  |  | 75 |  |  |
Derivative Contracts, Net [Member] | Liabilities Of Consolidated VIEs [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning Balance, Fair Value Liabilities |  |  | 370 |  |  |  |  |
Unrealized Gains / (Losses) Included in Earnings, Liabilities |  |  | 17 |  |  |  | 20 |
Unrealized Gains / (Losses) Included in OCI, Liabilities |  |  |  |  |  |  |  |
Purchases, Issuances and Settlements, net, Liabilities |  |  | 155 |  |  |  | 522 |
Transfers into Level 3, Liabilities |  |  |  | [1] |  |  |  | [1]
Transfers out of Level 3, Liabilities |  |  |  | [1] |  |  |  | [1]
Ending Balance, Fair Value Liabilities |  |  | 542 |  |  |  | 542 |
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets still held, Liabilities |  |  | $ 17 |  |  |  | $ 20 |
[1] | Transferred in and out at the end of the period.

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- Definition Purchases that have taken place during the period in relation to liabilities measured at fair value and categorized within 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)(2) -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 + Details
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Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition This element represents purchases, sales, issuances, and settlements (net) which have taken place during the period in relation to liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c(2) -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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Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Sales that have taken place during the period in relation to liabilities measured at fair value and categorized within 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)(2) -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySales
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Settlements that have taken place during the period in relation to liabilities measured at fair value and categorized within 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)(2) -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements
Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition This element represents a liability measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. + 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) -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 + Details
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Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant