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FAIR VALUE MEASUREMENT (Details 2) (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 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
Sep. 30, 2013
Interest-bearing deposits
Recurring
Sep. 30, 2012
Interest-bearing deposits
Recurring
Sep. 30, 2013
Interest-bearing deposits
Recurring
Sep. 30, 2012
Interest-bearing deposits
Recurring
Sep. 30, 2013
Federal funds purchased and securities loaned or sold under agreements to repurchase
Recurring
Sep. 30, 2012
Federal funds purchased and securities loaned or sold under agreements to repurchase
Recurring
Sep. 30, 2013
Federal funds purchased and securities loaned or sold under agreements to repurchase
Recurring
Sep. 30, 2012
Federal funds purchased and securities loaned or sold under agreements to repurchase
Recurring
Sep. 30, 2013
Trading account liabilities
Securities sold, not yet purchased
Recurring
Sep. 30, 2012
Trading account liabilities
Securities sold, not yet purchased
Recurring
Sep. 30, 2013
Trading account liabilities
Securities sold, not yet purchased
Recurring
Sep. 30, 2012
Trading account liabilities
Securities sold, not yet purchased
Recurring
Sep. 30, 2013
Short-term borrowings
Recurring
Sep. 30, 2012
Short-term borrowings
Recurring
Sep. 30, 2013
Short-term borrowings
Recurring
Sep. 30, 2012
Short-term borrowings
Recurring
Sep. 30, 2013
Long-term debt
Recurring
Sep. 30, 2012
Long-term debt
Recurring
Sep. 30, 2013
Long-term debt
Recurring
Sep. 30, 2012
Long-term debt
Recurring
Sep. 30, 2013
Other financial liabilities measured on a recurring basis
Recurring
Sep. 30, 2012
Other financial liabilities measured on a recurring basis
Recurring
Sep. 30, 2013
Other financial liabilities measured on a recurring basis
Recurring
Sep. 30, 2012
Other financial liabilities measured on a recurring basis
Recurring
Sep. 30, 2013
Federal funds sold and securities borrowed or purchased under agreements to resell
Sep. 30, 2013
Federal funds sold and securities borrowed or purchased under agreements to resell
Recurring
Sep. 30, 2012
Federal funds sold and securities borrowed or purchased under agreements to resell
Recurring
Sep. 30, 2013
Federal funds sold and securities borrowed or purchased under agreements to resell
Recurring
Sep. 30, 2012
Federal funds sold and securities borrowed or purchased under agreements to resell
Recurring
Sep. 30, 2013
Trading account assets
Recurring
Sep. 30, 2012
Trading account assets
Recurring
Sep. 30, 2013
Trading account assets
Recurring
Sep. 30, 2012
Trading account assets
Recurring
Sep. 30, 2013
Trading account assets
Mortgage-backed securities
Recurring
Sep. 30, 2012
Trading account assets
Mortgage-backed securities
Recurring
Sep. 30, 2013
Trading account assets
Mortgage-backed securities
Recurring
Sep. 30, 2012
Trading account assets
Mortgage-backed securities
Recurring
Sep. 30, 2013
Trading account assets
U.S. government-sponsored agency guaranteed
Recurring
Sep. 30, 2012
Trading account assets
U.S. government-sponsored agency guaranteed
Recurring
Sep. 30, 2013
Trading account assets
U.S. government-sponsored agency guaranteed
Recurring
Sep. 30, 2012
Trading account assets
U.S. government-sponsored agency guaranteed
Recurring
Sep. 30, 2013
Trading account assets
Residential
Recurring
Sep. 30, 2012
Trading account assets
Residential
Recurring
Sep. 30, 2013
Trading account assets
Residential
Recurring
Sep. 30, 2012
Trading account assets
Residential
Recurring
Sep. 30, 2013
Trading account assets
Commercial
Recurring
Sep. 30, 2012
Trading account assets
Commercial
Recurring
Sep. 30, 2013
Trading account assets
Commercial
Recurring
Sep. 30, 2012
Trading account assets
Commercial
Recurring
Sep. 30, 2013
Trading account assets
U.S. Treasury and federal agency securities
Recurring
Sep. 30, 2012
Trading account assets
U.S. Treasury and federal agency securities
Recurring
Sep. 30, 2013
Trading account assets
U.S. Treasury and federal agency securities
Recurring
Sep. 30, 2012
Trading account assets
U.S. Treasury and federal agency securities
Recurring
Sep. 30, 2013
Trading account assets
State and municipal securities
Recurring
Sep. 30, 2012
Trading account assets
State and municipal securities
Recurring
Sep. 30, 2013
Trading account assets
State and municipal securities
Recurring
Sep. 30, 2012
Trading account assets
State and municipal securities
Recurring
Sep. 30, 2013
Trading account assets
Foreign government
Recurring
Sep. 30, 2012
Trading account assets
Foreign government
Recurring
Sep. 30, 2013
Trading account assets
Foreign government
Recurring
Sep. 30, 2012
Trading account assets
Foreign government
Recurring
Sep. 30, 2013
Trading account assets
Corporate
Recurring
Sep. 30, 2012
Trading account assets
Corporate
Recurring
Sep. 30, 2013
Trading account assets
Corporate
Recurring
Sep. 30, 2012
Trading account assets
Corporate
Recurring
Sep. 30, 2013
Trading account assets
Equity securities
Recurring
Sep. 30, 2012
Trading account assets
Equity securities
Recurring
Sep. 30, 2013
Trading account assets
Equity securities
Recurring
Sep. 30, 2012
Trading account assets
Equity securities
Recurring
Sep. 30, 2013
Trading account assets
Asset-backed securities
Recurring
Sep. 30, 2012
Trading account assets
Asset-backed securities
Recurring
Sep. 30, 2013
Trading account assets
Asset-backed securities
Recurring
Sep. 30, 2012
Trading account assets
Asset-backed securities
Recurring
Sep. 30, 2013
Trading account assets
Other debt securities
Recurring
Sep. 30, 2012
Trading account assets
Other debt securities
Recurring
Sep. 30, 2013
Trading account assets
Other debt securities
Recurring
Sep. 30, 2012
Trading account assets
Other debt securities
Recurring
Sep. 30, 2013
Derivatives
Recurring
Sep. 30, 2012
Derivatives
Recurring
Sep. 30, 2013
Derivatives
Recurring
Sep. 30, 2012
Derivatives
Recurring
Sep. 30, 2013
Investments:
Recurring
Sep. 30, 2012
Investments:
Recurring
Sep. 30, 2013
Investments:
Recurring
Sep. 30, 2012
Investments:
Recurring
Sep. 30, 2013
Investments:
Mortgage-backed securities
Recurring
Sep. 30, 2012
Investments:
Mortgage-backed securities
Recurring
Sep. 30, 2013
Investments:
Mortgage-backed securities
Recurring
Sep. 30, 2012
Investments:
Mortgage-backed securities
Recurring
Sep. 30, 2013
Investments:
U.S. government-sponsored agency guaranteed
Recurring
Sep. 30, 2012
Investments:
U.S. government-sponsored agency guaranteed
Recurring
Sep. 30, 2013
Investments:
U.S. government-sponsored agency guaranteed
Recurring
Sep. 30, 2012
Investments:
U.S. government-sponsored agency guaranteed
Recurring
Sep. 30, 2012
Investments:
Residential
Recurring
Sep. 30, 2013
Investments:
Residential
Recurring
Sep. 30, 2012
Investments:
Residential
Recurring
Sep. 30, 2013
Investments:
Commercial
Recurring
Sep. 30, 2012
Investments:
Commercial
Recurring
Sep. 30, 2013
Investments:
Commercial
Recurring
Sep. 30, 2012
Investments:
Commercial
Recurring
Sep. 30, 2012
Investments:
U.S. Treasury and federal agency securities
Recurring
Sep. 30, 2013
Investments:
U.S. Treasury and federal agency securities
Recurring
Sep. 30, 2012
Investments:
U.S. Treasury and federal agency securities
Recurring
Jun. 30, 2013
Investments:
U.S. Treasury and federal agency securities
Recurring
Sep. 30, 2013
Investments:
State and municipal securities
Recurring
Sep. 30, 2012
Investments:
State and municipal securities
Recurring
Sep. 30, 2013
Investments:
State and municipal securities
Recurring
Sep. 30, 2012
Investments:
State and municipal securities
Recurring
Sep. 30, 2013
Investments:
Foreign government
Recurring
Sep. 30, 2012
Investments:
Foreign government
Recurring
Sep. 30, 2013
Investments:
Foreign government
Recurring
Sep. 30, 2012
Investments:
Foreign government
Recurring
Sep. 30, 2013
Investments:
Corporate
Recurring
Sep. 30, 2012
Investments:
Corporate
Recurring
Sep. 30, 2013
Investments:
Corporate
Recurring
Sep. 30, 2012
Investments:
Corporate
Recurring
Sep. 30, 2013
Investments:
Equity securities
Recurring
Sep. 30, 2012
Investments:
Equity securities
Recurring
Sep. 30, 2013
Investments:
Equity securities
Recurring
Sep. 30, 2012
Investments:
Equity securities
Recurring
Sep. 30, 2013
Investments:
Asset-backed securities
Recurring
Sep. 30, 2012
Investments:
Asset-backed securities
Recurring
Sep. 30, 2013
Investments:
Asset-backed securities
Recurring
Sep. 30, 2012
Investments:
Asset-backed securities
Recurring
Sep. 30, 2013
Investments:
Other debt securities
Recurring
Sep. 30, 2012
Investments:
Other debt securities
Recurring
Sep. 30, 2013
Investments:
Other debt securities
Recurring
Sep. 30, 2012
Investments:
Other debt securities
Recurring
Sep. 30, 2013
Investments:
Non-marketable equity securities
Recurring
Sep. 30, 2012
Investments:
Non-marketable equity securities
Recurring
Sep. 30, 2013
Investments:
Non-marketable equity securities
Recurring
Sep. 30, 2012
Investments:
Non-marketable equity securities
Recurring
Sep. 30, 2013
Loans
Recurring
Sep. 30, 2012
Loans
Recurring
Sep. 30, 2013
Loans
Recurring
Sep. 30, 2012
Loans
Recurring
Sep. 30, 2013
Mortgage servicing rights
Recurring
Sep. 30, 2012
Mortgage servicing rights
Recurring
Sep. 30, 2013
Mortgage servicing rights
Recurring
Sep. 30, 2012
Mortgage servicing rights
Recurring
Sep. 30, 2013
Other financial assets measured on a recurring basis
Recurring
Sep. 30, 2012
Other financial assets measured on a recurring basis
Recurring
Sep. 30, 2013
Other financial assets measured on a recurring basis
Recurring
Sep. 30, 2012
Other financial assets measured on a recurring basis
Recurring
Sep. 30, 2013
Interest rate contracts
Derivatives
Recurring
Sep. 30, 2012
Interest rate contracts
Derivatives
Recurring
Sep. 30, 2013
Interest rate contracts
Derivatives
Recurring
Sep. 30, 2012
Interest rate contracts
Derivatives
Recurring
Sep. 30, 2013
Foreign exchange contracts
Derivatives
Recurring
Sep. 30, 2012
Foreign exchange contracts
Derivatives
Recurring
Sep. 30, 2013
Foreign exchange contracts
Derivatives
Recurring
Sep. 30, 2012
Foreign exchange contracts
Derivatives
Recurring
Sep. 30, 2013
Equity contracts
Derivatives
Recurring
Sep. 30, 2012
Equity contracts
Derivatives
Recurring
Sep. 30, 2013
Equity contracts
Derivatives
Recurring
Sep. 30, 2012
Equity contracts
Derivatives
Recurring
Sep. 30, 2013
Commodity and other contracts
Derivatives
Recurring
Sep. 30, 2012
Commodity and other contracts
Derivatives
Recurring
Sep. 30, 2013
Commodity and other contracts
Derivatives
Recurring
Sep. 30, 2012
Commodity and other contracts
Derivatives
Recurring
Sep. 30, 2013
Credit derivatives
Derivatives
Recurring
Sep. 30, 2012
Credit derivatives
Derivatives
Recurring
Sep. 30, 2013
Credit derivatives
Derivatives
Recurring
Sep. 30, 2012
Credit derivatives
Derivatives
Recurring
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation                                                                                                                                                                                                                                                                                                                                        
Balance at beginning of period, asset                                                   $ 4,177 $ 4,414 $ 5,043 $ 4,701 $ 13,862 $ 13,332 $ 13,823 $ 15,792 $ 4,968 $ 3,256 $ 4,249 $ 2,988 $ 1,704 $ 895 $ 1,325 $ 861 $ 2,938 $ 1,945 $ 1,805 $ 1,509 $ 326 $ 416 $ 1,119 $ 618   $ 13   $ 3 $ 241 $ 223 $ 195 $ 252 $ 240 $ 333 $ 311 $ 521 $ 1,688 $ 2,189 $ 2,030 $ 3,240 $ 190 $ 217 $ 264 $ 244 $ 4,259 $ 4,835 $ 4,453 $ 5,801 $ 2,276 $ 2,266 $ 2,321 $ 2,743 $ 99 $ (2,089) $ (2,380) $ (779) $ 9,838 $ 12,929 $ 11,907 $ 16,797 $ 423 $ 1,415 $ 1,663 $ 687 $ 420 $ 1,399 $ 1,458 $ 679 $ 11 $ 205 $ 8 $ 3 $ 5       $ 12 $ 75 $ 9 $ 684 $ 480 $ 849 $ 667 $ 367 $ 329 $ 383 $ 447 $ 404 $ 421 $ 385 $ 989 $ 779 $ 1,180 $ 773 $ 1,453 $ 1,758 $ 2,771 $ 2,220 $ 4,041 $ 51 $ 55 $ 258 $ 120 $ 5,363 $ 6,278 $ 5,364 $ 8,318 $ 4,321 $ 4,737 $ 4,931 $ 4,682 $ 2,524 $ 2,117 $ 1,942 $ 2,569 $ 245 $ 2,375 $ 2,452 $ 2,245 $ 1,083 $ 619 $ 181 $ 726 $ 367 $ (517)   $ (562) $ (1,092) $ (1,587) $ (1,448) $ (1,737) $ (218) $ (902) $ (771) $ (934) $ (41) $ 298 $ (342) $ 1,728
Net realized/unrealized gains (losses) included in principal transactions, assets                                                   70 5 (93) 70 354 335 1,345 581 166 103 692 146 43 (12) 119 21 99 116 457 196 24 (1) 116 (71)         9 13 28 30 (3) 1 (5) 5 62   32 9 (38) 13 (34) (58) 99 212 467 434 59 (7) 165 15 (284) (925) 865 (1,995)                                                                                                                               232 (188) 544 (46) 39 50 350 130 (224)   37 199 (223) (12) 188 (51) (108) (775) (254) (2,227)
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets                                                                                                                                                                   173 61 414 319 (12) 13 13 9 (12) 10 (10) 6 3 23 3                 6 (4) 4 9 3 (3) (1) 13 17 (6) 14 (11) 34 52 31 101 14 (170) 64 (160)   (53)   (53) 111 232 289 411 (19) 79 (97) 17 (6) (169) 411 (462) 45 207 51 305                                        
Transfers into Level 3, assets                                                   29 258 627 283 805 980 2,847 3,253 465 541 1,674 1,630 295 135 1,032 673 61 243 378 703 109 163 264 254 54   54   2 4 2 4 7 14 60 26 129 43 267 391 132 30 180 49 14 24 100 189 2 324 510 964 (49) 48 823 (82) 191 1,243 3,763 1,368 81 675 2,041 675 80 472 1,977 472 203 60 203 1   4   75   75   5   12   63 68 168 148 42 23 333 68     17     402 1,192 402                   87 353 1,004           13 1 21 (47) 172 702 295 (1) (70) 29 (152) (13) (84) (37) (120) (12) (15) (5) (20) 24 45 134 (85)
Transfers out of Level 3, assets                                                   (534)   (1,852) (377) (1,076) (678) (3,550) (4,146) (639) (306) (1,740) (1,139) (453) (199) (1,158) (544) (132) (78) (344) (378) (54) (29) (238) (217)               (7)   (124) (61) (864) (240) (58) (340) (449) (25) (4) (184) (17) (88) (43) (143) (104) (84) (143) (1,082) (1,566) (150) (342) 134 (62) (427) (1,355) (6,377) (4,009) (371) (1,262) (3,998) (2,795) (371) (1,257) (3,721) (2,778)   (265) (6)   (5) (12) (11)     (75)       (117) (151) (55) (80) (256) (236)   (2) (116) (698) (1)   (1)     (11) (1,684) (54)     (205)                 (25)               (31) (121) (275) (13) (394) (9) (17) (6) 29 (46) 20 300 387 32   37 45 (6) (70) (184) (129)
Purchases, assets                                                   25   42   3,569 3,533 12,858 13,285 1,267 219 4,280 2,106 160 97 1,129 352 1,049 84 2,947 1,401 58 38 204 353       13 11 20 86 48 83 39 200 881 408 392 1,787 2,148 331 52 471 256 748 2,030 3,780 5,690 721 781 2,254 2,143 138 153 439 947 536 1,764 3,126 4,796 44 617 643 2,882 44 580 514 2,825 37 117 46     12 11 12   12   54 118 261 276 105 127 394 328 85 7 101 136     1   180 755 1,015 767   52   52 68 76 621 343   142 59 249       2   1 216 3 65 23 208 239 6 2 21 190 60 101 176 304   25 15 98 7 2 19 116
Issuance, assets                                                           6 17 61 62 6 17 61 62 6 17 61 62                                                                                                                                                                                       631 415 644 930 166 101 543 322 107 635 447 1,264                                        
Sales, assets                                                           (3,554) (3,723) (12,023) (12,696) (1,724) (715) (4,637) (2,597) (320) (217) (1,027) (631) (1,320) (435) (2,541) (1,553) (84) (63) (1,069) (413)   (13)   (16) (8) (12) (56) (79) (85) (65) (263) (371) (642) (215) (1,461) (1,614) (33) (21) (140) (163) (964) (1,933) (4,372) (6,226) (98) (749) (1,094) (1,630) (103) (190) (274) (949) (353) (1,921) (1,040) (4,112) (37) (11) (177) (11) (37)   (37)   (11) (140) (11)           (3)     (23) (3) (158) (210) (140) (26) (291) (216) (75) (66) (222) (102) (13) (54) (22) (228) (14) (27) (31) (77) (51)   (53) (64)   (1,734) (83) (3,204)   (144) (6) (239)     (1) (5) (31) (4) (2,041) (46) (33) (19) (115) (158) (1) (6) (9) (203) (69) (163) (125) (498)   (2) (25) (80)       (10)
Settlements, assets                                                           (250) (141) (1,645) (2,476) (195) (36) (265) (117) (195) (32) (241) (110)   (4) (7) (7)     (17)                           (4)   (914) (1,374)   (44)   (68)   (3) (217) (662) (51) (58) (249) (255) 217 (371) 261 (796) (553) (630) (2,388) (3,068)     (57)       (57)                             (125)   (17) (34) (71) (103) (1) (40) (23) (45)   (120)   (268) (95) (368) (1,023) (1,567)       (1) (440) (68) (1,089) (1,084) (600) (252) (1,551) (1,554) (104) (129) (315) (506) (96) (562) (856) (1,096) 156 (454) (172) (784)   (32) 16 (22) 53 84 (234) (164) (76) (8) 64 28 84 39 587 146
Balance at end of period, asset                                                   3,767 4,677 3,767 4,677 13,716 13,655 13,716 13,655 4,314 3,079 4,314 3,079 1,240 684 1,240 684 2,695 1,871 2,695 1,871 379 524 379 524 54   54   255 248 255 248 242 198 242 198 1,401 2,351 1,401 2,351 557 243 557 243 4,068 5,122 4,068 5,122 2,825 2,414 2,825 2,414 (132) (3,716) (132) (3,716) 9,405 12,091 9,405 12,091 128 1,447 128 1,447 124 1,204 124 1,204 243   243 4   4   87 9 87 9 726 591 726 591 326 381 326 381 472 337 472 337 799 1,058 799 1,058 1,843 3,352 1,843 3,352   54   54 5,102 4,784 5,102 4,784 4,333 5,064 4,333 5,064 2,580 1,920 2,580 1,920 270 2,665 270 2,665 1,335 (122) 1,335 (122) 401 (590) 401 (590) (1,331) (1,629) (1,331) (1,629) (497) (914) (497) (914) (40) (461) (40) (461)
Unrealized gains (losses) still held, assets                                                   (5)   476   207 164 224 62 (28) (2) 161 (2) 4 (21) 47 (27) 16 18 107 13 (48) 1 7 12 2   2   4 5 2 3 1 3 1 2 44 1 (375) (40) 72 (7) 347 (27) 100 162 80 126 12 2 6   (1,106) (83) (741) (1,745) 153 (50) 279 216 9 55 9 55 9 55 9 55                       2 6 (3) (3) (28) 1 (36) 3 8 (4) 4 5 33 28 30 16 29 (170) 4 1         100 34 271 139 (33) 15 (99) 65 (10) (169) 181 (464) 41 207 266 235 530 194 1,430 (169) (15) (85) (183) (14) (814) (328) (1,652) (581) (332) 216 108 (55) (475) (80) (444) (926)
Threshold tenor of repo curves to classify structured reverse repos as level 3                                                 5 years                                                                                                                                                                                                                                                                                      
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation                                                                                                                                                                                                                                                                                                                                        
Balance at beginning of period, liability 831 698 786 431 1,007 1,045 841 1,061 450 148 365 412 335 367 112 499 6,811 5,952 6,726 6,904 95 2 24 3                                                                                                                                                                                                                                                                                        
Net realized/unrealized gains (losses) included in principal transactions, liabilities         14 (24) 74 (89) 40 16 51 (44) (1) (20) 25 (76) (309) (135) 62 6                                                                                                                                                                                                                                                                                                
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities (19) (85) (86) (105)                         44 8 113 89 (23) (3) (208) (5)                                                                                                                                                                                                                                                                                        
Transfers into Level 3, liabilities     22 213 15   216   30 13 54 18 2 43 2 46 375 363 1,740 712     5                                                                                                                                                                                                                                                                                          
Transfers out of Level 3, liabilities   (36)   (36)   (14) (15) (14) (10) (12) (21) (43)     (4) (11) (1,016) (216) (2,030) (1,122)     (2)                                                                                                                                                                                                                                                                                          
Purchases, liability                                             (3) (2)                                                                                                                                                                                                                                                                                        
Issuance, liability 23 71 86 251                 25 66 316 261 54 648 959 1,823 10 1 100 2                                                                                                                                                                                                                                                                                        
Sales, liability           (215) 40 (211) 182 24 358 164             (1)     (1)   (1)                                                                                                                                                                                                                                                                                        
Settlements, liability (5) (57) (112) (203) (113) 1 (113) (84) (136) (32) (229) (470) (200) (397) (238) (772) (316) (408) (1,046) (1,756) (111) (2) (315) (4)                                                                                                                                                                                                                                                                                        
Balance at end of period, liability 868 761 868 761 895 841 895 841 476 125 476 125 163 99 163 99 6,173 6,466 6,173 6,466 17 3 17 3                                                                                                                                                                                                                                                                                        
Unrealized gains (losses) still held, liabilities $ (8)   $ (298) $ (142) $ 6 $ 4 $ 35 $ 36   $ 9 $ 132 $ (40) $ (42) $ (10) $ (40) $ (26) $ (349) $ (245) $ (1,027) $ (534) $ (23) $ (3) $ (26) $ (2)