FAIR VALUE MEASUREMENT - Level 3 Fair Value Rollforward (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Trading account assets and liabilities
Fair value, Derivative assets (liabilities) measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset (liability), net	$ (5,114)	$ (4,245)	$ (4,753)	$ (2,229)
Net realized/unrealized gains (losses) included in principal transactions	(93)	(770)	(1,398)	(3,098)
Transfers into Level 3	(51)	(323)	(18)	(109)
Transfers out of Level 3	63	287	706	(211)
Purchases	57	73	307	765
Issuances	0	0	0	20
Sales	(152)	(145)	(526)	(762)
Settlements	109	364	501	865
Balance at end of period, asset (liability), net	(5,181)	(4,759)	(5,181)	(4,759)
Unrealized gains (losses) still held	(422)	(18)	(543)	(1,414)
Trading account assets and liabilities | Interest rate contracts
Fair value, Derivative assets (liabilities) measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset (liability), net	(288)	(374)	(663)	(495)
Net realized/unrealized gains (losses) included in principal transactions	196	(82)	4	(408)
Transfers into Level 3	4	(59)	(24)	250
Transfers out of Level 3	(4)	77	647	116
Purchases	25	5	90	147
Issuances	0	0	0	(18)
Sales	(20)	(37)	(225)	(140)
Settlements	(114)	(93)	(30)	(15)
Balance at end of period, asset (liability), net	(201)	(563)	(201)	(563)
Unrealized gains (losses) still held	120	(143)	65	84
Trading account assets and liabilities | Foreign exchange contracts
Fair value, Derivative assets (liabilities) measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset (liability), net	184	(29)	413	620
Net realized/unrealized gains (losses) included in principal transactions	(92)	10	(389)	(667)
Transfers into Level 3	1	69	54	73
Transfers out of Level 3	(4)	(13)	(63)	(73)
Purchases	(6)	52	32	158
Issuances	0	0	0	0
Sales	(3)	(50)	(37)	(141)
Settlements	68	50	138	119
Balance at end of period, asset (liability), net	148	89	148	89
Unrealized gains (losses) still held	(92)	149	(134)	(428)
Trading account assets and liabilities | Equity contracts
Fair value, Derivative assets (liabilities) measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset (liability), net	(1,647)	(1,071)	(1,557)	(800)
Net realized/unrealized gains (losses) included in principal transactions	201	29	98	137
Transfers into Level 3	(52)	14	(34)	78
Transfers out of Level 3	(34)	123	(8)	(305)
Purchases	31	17	180	63
Issuances	0	0	0	38
Sales	(126)	(28)	(263)	(99)
Settlements	(221)	(51)	(264)	(79)
Balance at end of period, asset (liability), net	(1,848)	(967)	(1,848)	(967)
Unrealized gains (losses) still held	(10)	(189)	(22)	191
Trading account assets and liabilities | Commodity contracts
Fair value, Derivative assets (liabilities) measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset (liability), net	(2,024)	(2,017)	(1,945)	(1,861)
Net realized/unrealized gains (losses) included in principal transactions	(248)	(76)	(576)	(357)
Transfers into Level 3	(29)	(379)	29	(428)
Transfers out of Level 3	(10)	74	39	48
Purchases	0	3	0	359
Issuances	0	0	0	0
Sales	(3)	5	(3)	(347)
Settlements	(25)	91	117	287
Balance at end of period, asset (liability), net	(2,339)	(2,299)	(2,339)	(2,299)
Unrealized gains (losses) still held	(255)	(285)	(255)	11
Trading account assets and liabilities | Credit derivatives
Fair value, Derivative assets (liabilities) measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset (liability), net	(1,339)	(754)	(1,001)	307
Net realized/unrealized gains (losses) included in principal transactions	(150)	(651)	(535)	(1,803)
Transfers into Level 3	25	32	(43)	(82)
Transfers out of Level 3	115	26	91	3
Purchases	7	(4)	5	38
Issuances	0	0	0	0
Sales	0	(35)	2	(35)
Settlements	401	367	540	553
Balance at end of period, asset (liability), net	(941)	(1,019)	(941)	(1,019)
Unrealized gains (losses) still held	(185)	450	(197)	(1,272)
Interest-bearing deposits
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, liability	300	433	293	434
Net realized/unrealized gains (losses) included in principal transactions, liabilities	0	0	0	0
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities	2	(41)	(9)	(76)
Transfers into Level 3, liabilities	0	0	40	322
Transfers out of Level 3, liabilities	0	(100)	0	(309)
Purchases, liability	0	0	0	0
Issuance, liability	0	0	0	5
Sales, liability	0	0	0	0
Settlements, liability	(2)	(32)	(24)	(116)
Balance at end of period, liability	300	260	300	260
Unrealized gains (losses) still held, liabilities	6	42	6	42
Federal funds purchased and securities loaned or sold under agreement to repurchase
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, liability	807	1,107	849	1,247
Net realized/unrealized gains (losses) included in principal transactions, liabilities	1	(10)	(7)	11
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities	0	0	0	0
Transfers into Level 3, liabilities	0	0	0	0
Transfers out of Level 3, liabilities	0	(150)	0	(150)
Purchases, liability	0	0	0	0
Issuance, liability	0	0	0	0
Sales, liability	0	11	0	27
Settlements, liability	(43)	(35)	(77)	(212)
Balance at end of period, liability	765	923	765	923
Unrealized gains (losses) still held, liabilities	4	8	4	(24)
Trading account liabilities | Securities sold, not yet purchased
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, liability	1,143	12	1,177	199
Net realized/unrealized gains (losses) included in principal transactions, liabilities	(496)	30	(490)	16
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities	0	0	0	0
Transfers into Level 3, liabilities	5	21	18	118
Transfers out of Level 3, liabilities	(10)	(42)	(53)	(85)
Purchases, liability	0	(9)	0	(70)
Issuance, liability	0	0	0	(41)
Sales, liability	88	142	265	212
Settlements, liability	(46)	5	(233)	(190)
Balance at end of period, liability	684	159	684	159
Unrealized gains (losses) still held, liabilities	24	(30)	24	(61)
Trading account liabilities | Other trading liabilities
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, liability	0	0	0	0
Net realized/unrealized gains (losses) included in principal transactions, liabilities	0	0	0	0
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities	0	0	0	0
Transfers into Level 3, liabilities	0	1	0	1
Transfers out of Level 3, liabilities	0	0	0	0
Purchases, liability	0	0	0	0
Issuance, liability	0	0	0	0
Sales, liability	0	0	0	0
Settlements, liability	0	0	0	0
Balance at end of period, liability	0	1	0	1
Unrealized gains (losses) still held, liabilities	0	0	0	0
Short-term borrowings
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, liability	29	53	42	9
Net realized/unrealized gains (losses) included in principal transactions, liabilities	13	9	(18)	36
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities	0	0	0	0
Transfers into Level 3, liabilities	3	1	4	18
Transfers out of Level 3, liabilities	(1)	(32)	(1)	(36)
Purchases, liability	0	0	0	0
Issuance, liability	12	15	31	56
Sales, liability	0	0	0	0
Settlements, liability	0	(14)	(2)	(51)
Balance at end of period, liability	56	32	56	32
Unrealized gains (losses) still held, liabilities	7	2	7	2
Long-term debt
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Transfers out of Level 3, assets		(1,600)	(1,500)
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, liability	11,831	9,138	9,744	7,543
Net realized/unrealized gains (losses) included in principal transactions, liabilities	(1,057)	191	(456)	217
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities	0	0	0	0
Transfers into Level 3, liabilities	181	947	702	2,168
Transfers out of Level 3, liabilities	(490)	(1,550)	(1,457)	(3,393)
Purchases, liability	0	0	0	0
Issuance, liability	419	1,719	2,701	4,591
Sales, liability	0	0	0	61
Settlements, liability	437	(1,263)	87	(2,005)
Balance at end of period, liability	11,321	9,182	11,321	9,182
Unrealized gains (losses) still held, liabilities	716	(191)	708	(277)
Other financial liabilities
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, liability	2	5	8	14
Net realized/unrealized gains (losses) included in principal transactions, liabilities	0	0	0	0
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities	0	26	0	33
Transfers into Level 3, liabilities	0	2	0	2
Transfers out of Level 3, liabilities	0	0	0	(10)
Purchases, liability	0	(1)	0	(7)
Issuance, liability	1	0	3	2
Sales, liability	0	0	(1)	0
Settlements, liability	(1)	0	(8)	(2)
Balance at end of period, liability	2	32	2	32
Unrealized gains (losses) still held, liabilities	(1)	(2)	(1)	(7)
Federal funds sold and securities borrowed or purchased under agreements to resell
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	1,002	1,819	1,496	1,337
Net realized/unrealized gains (losses) included in principal transactions	(338)	(6)	(340)	2
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3, assets	0	0	(491)	(28)
Purchases, assets	0	5	0	508
Issuance, assets	0	0	0	0
Sales, assets	0	0	0	0
Settlements, assets	0	(505)	(1)	(506)
Balance at end of period, asset	664	1,313	664	1,313
Unrealized gains (losses) still held, assets	(338)	(3)	0	3
Trading non-derivative assets
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	5,255	12,006	6,251	12,418
Net realized/unrealized gains (losses) included in principal transactions	391	564	772	344
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	204	586	1,185	3,296
Transfers out of Level 3, assets	(826)	(2,373)	(2,048)	(5,190)
Purchases, assets	2,441	2,768	5,062	8,007
Issuance, assets	4	9	5	7
Sales, assets	(1,846)	(2,654)	(5,589)	(7,957)
Settlements, assets	(4)	2	(19)	(17)
Balance at end of period, asset	5,619	10,908	5,619	10,908
Unrealized gains (losses) still held, assets	178	(575)	279	158
Trading non-derivative assets | U.S. government-sponsored agency guaranteed
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	204	730	176	744
Net realized/unrealized gains (losses) included in principal transactions	0	1	4	13
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	75	67	154	485
Transfers out of Level 3, assets	(21)	(387)	(86)	(969)
Purchases, assets	174	96	438	857
Issuance, assets	0	0	0	0
Sales, assets	(123)	(286)	(377)	(920)
Settlements, assets	0	7	0	18
Balance at end of period, asset	309	228	309	228
Unrealized gains (losses) still held, assets	0	0	1	4
Trading non-derivative assets | Mortgage-backed securities - Residential
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	327	801	399	1,326
Net realized/unrealized gains (losses) included in principal transactions	24	116	61	104
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	41	5	88	134
Transfers out of Level 3, assets	(9)	(66)	(58)	(153)
Purchases, assets	39	18	105	275
Issuance, assets	0	0	0	0
Sales, assets	(71)	(433)	(244)	(1,239)
Settlements, assets	0	0	0	(6)
Balance at end of period, asset	351	441	351	441
Unrealized gains (losses) still held, assets	12	(58)	35	23
Trading non-derivative assets | Mortgage-backed securities - Commercial
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	318	390	206	517
Net realized/unrealized gains (losses) included in principal transactions	10	2	7	15
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	22	1	66	180
Transfers out of Level 3, assets	(17)	(107)	(46)	(209)
Purchases, assets	11	309	445	661
Issuance, assets	0	0	0	0
Sales, assets	(232)	(151)	(566)	(720)
Settlements, assets	0	0	0	0
Balance at end of period, asset	112	444	112	444
Unrealized gains (losses) still held, assets	5	6	(5)	(23)
Trading non-derivative assets | Mortgage-backed securities
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	849	1,921	781	2,587
Net realized/unrealized gains (losses) included in principal transactions	34	119	72	132
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	138	73	308	799
Transfers out of Level 3, assets	(47)	(560)	(190)	(1,331)
Purchases, assets	224	423	988	1,793
Issuance, assets	0	0	0	0
Sales, assets	(426)	(870)	(1,187)	(2,879)
Settlements, assets	0	7	0	12
Balance at end of period, asset	772	1,113	772	1,113
Unrealized gains (losses) still held, assets	17	(52)	31	4
Trading non-derivative assets | U.S. Treasury and federal agency securities
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	0	3	1	1
Net realized/unrealized gains (losses) included in principal transactions	0	0	0	0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	0	0	0	2
Transfers out of Level 3, assets	0	0	0	0
Purchases, assets	0	0	0	0
Issuance, assets	0	0	0	0
Sales, assets	0	(2)	(1)	(2)
Settlements, assets	0	0	0	0
Balance at end of period, asset	0	1	0	1
Unrealized gains (losses) still held, assets	0	0	0	0
Trading non-derivative assets | State and municipal securities
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	284	117	296	351
Net realized/unrealized gains (losses) included in principal transactions	(2)	18	3	26
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	0	118	24	136
Transfers out of Level 3, assets	0	(37)	(48)	(253)
Purchases, assets	49	56	137	224
Issuance, assets	0	0	0	0
Sales, assets	(61)	(115)	(142)	(327)
Settlements, assets	0	0	0	0
Balance at end of period, asset	270	157	270	157
Unrealized gains (losses) still held, assets	(1)	(1)	(1)	0
Trading non-derivative assets | Foreign government
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	108	81	40	197
Net realized/unrealized gains (losses) included in principal transactions	(5)	(19)	2	(27)
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	4	0	88	2
Transfers out of Level 3, assets	(114)	0	(204)	(17)
Purchases, assets	161	24	288	99
Issuance, assets	0	0	0	0
Sales, assets	(59)	(23)	(119)	(191)
Settlements, assets	0	0	0	0
Balance at end of period, asset	95	63	95	63
Unrealized gains (losses) still held, assets	(2)	1	(1)	(2)
Trading non-derivative assets | Corporate
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	401	405	324	376
Net realized/unrealized gains (losses) included in principal transactions	105	39	320	323
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	16	49	132	129
Transfers out of Level 3, assets	(11)	(26)	(84)	(102)
Purchases, assets	148	414	424	748
Issuance, assets	0	0	0	0
Sales, assets	(268)	(208)	(725)	(796)
Settlements, assets	0	12	0	7
Balance at end of period, asset	391	685	391	685
Unrealized gains (losses) still held, assets	103	(31)	167	58
Trading non-derivative assets | Equity securities
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	240	3,970	127	3,684
Net realized/unrealized gains (losses) included in principal transactions	183	348	212	(187)
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	3	12	135	279
Transfers out of Level 3, assets	(41)	(811)	(54)	(871)
Purchases, assets	29	102	38	851
Issuance, assets	0	0	0	0
Sales, assets	(178)	(61)	(222)	(196)
Settlements, assets	0	0	0	0
Balance at end of period, asset	236	3,560	236	3,560
Unrealized gains (losses) still held, assets	6	(371)	20	(125)
Trading non-derivative assets | Asset-backed securities
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	1,570	2,670	1,868	2,739
Net realized/unrealized gains (losses) included in principal transactions	114	47	251	181
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	5	38	28	195
Transfers out of Level 3, assets	(6)	(42)	(87)	(237)
Purchases, assets	481	783	1,185	1,969
Issuance, assets	0	0	0	0
Sales, assets	(460)	(747)	(1,541)	(2,098)
Settlements, assets	0	0	0	0
Balance at end of period, asset	1,704	2,749	1,704	2,749
Unrealized gains (losses) still held, assets	26	(58)	34	87
Trading non-derivative assets | Other
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	1,803	2,839	2,814	2,483
Net realized/unrealized gains (losses) included in principal transactions	(38)	12	(88)	(104)
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	38	296	470	1,754
Transfers out of Level 3, assets	(607)	(897)	(1,400)	(2,379)
Purchases, assets	1,349	966	2,002	2,323
Issuance, assets	4	9	5	7
Sales, assets	(394)	(628)	(1,652)	(1,468)
Settlements, assets	(4)	(17)	(19)	(36)
Balance at end of period, asset	2,151	2,580	2,151	2,580
Unrealized gains (losses) still held, assets	29	(63)	29	136
Investments
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	3,836	4,613	3,861	5,059
Net realized/unrealized gains (losses) included in principal transactions	0	0	0	0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	(244)	(53)	(205)	208
Transfers into Level 3	36	129	175	631
Transfers out of Level 3, assets	(35)	(418)	(206)	(1,334)
Purchases, assets	684	644	1,674	1,373
Issuance, assets	0	0	0	0
Sales, assets	(803)	(249)	(1,712)	(1,178)
Settlements, assets	(49)	(313)	(162)	(406)
Balance at end of period, asset	3,425	4,353	3,425	4,353
Unrealized gains (losses) still held, assets	(114)	112	(25)	91
Investments | U.S. government-sponsored agency guaranteed
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	50	94	101	139
Net realized/unrealized gains (losses) included in principal transactions	0	0	0	0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	12	(4)	15	(29)
Transfers into Level 3	0	3	1	15
Transfers out of Level 3, assets	(5)	(10)	(60)	(72)
Purchases, assets	0	6	0	46
Issuance, assets	0	0	0	0
Sales, assets	0	0	0	(9)
Settlements, assets	0	0	0	(1)
Balance at end of period, asset	57	89	57	89
Unrealized gains (losses) still held, assets	28	(1)	30	49
Investments | Mortgage-backed securities - Residential
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	0	25	50	4
Net realized/unrealized gains (losses) included in principal transactions	0	0	0	0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	1	2	2
Transfers into Level 3	0	49	0	49
Transfers out of Level 3, assets	0	0	(47)	0
Purchases, assets	0	1	0	26
Issuance, assets	0	0	0	0
Sales, assets	0	(23)	(5)	(28)
Settlements, assets	0	0	0	0
Balance at end of period, asset	0	53	0	53
Unrealized gains (losses) still held, assets	0	0	0	1
Investments | Mortgage-backed securities - Commercial
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	0	5	0	2
Net realized/unrealized gains (losses) included in principal transactions	0	0	0	0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	(1)	0	(1)
Transfers into Level 3	3	0	3	6
Transfers out of Level 3, assets	0	(4)	0	(7)
Purchases, assets	0	0	8	0
Issuance, assets	0	0	0	0
Sales, assets	0	0	(8)	0
Settlements, assets	0	0	0	0
Balance at end of period, asset	3	0	3	0
Unrealized gains (losses) still held, assets	0	0	0	0
Investments | Mortgage-backed securities
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	50	124	151	145
Net realized/unrealized gains (losses) included in principal transactions	0	0	0	0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	12	(4)	17	(28)
Transfers into Level 3	3	52	4	70
Transfers out of Level 3, assets	(5)	(14)	(107)	(79)
Purchases, assets	0	7	8	72
Issuance, assets	0	0	0	0
Sales, assets	0	(23)	(13)	(37)
Settlements, assets	0	0	0	(1)
Balance at end of period, asset	60	142	60	142
Unrealized gains (losses) still held, assets	28	(1)	30	50
Investments | U.S. Treasury and federal agency securities
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	1	3	2	4
Net realized/unrealized gains (losses) included in principal transactions	0	0	0	0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3, assets	0	0	0	0
Purchases, assets	0	0	0	0
Issuance, assets	0	0	0	0
Sales, assets	(1)	(1)	(2)	(2)
Settlements, assets	0	0	0	0
Balance at end of period, asset	0	2	0	2
Unrealized gains (losses) still held, assets	0	0	0	0
Investments | State and municipal securities
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	1,285	2,016	1,211	2,192
Net realized/unrealized gains (losses) included in principal transactions	0	0	0	0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	(2)	(54)	37	108
Transfers into Level 3	21	5	70	396
Transfers out of Level 3, assets	(3)	(338)	(36)	(1,121)
Purchases, assets	16	60	92	300
Issuance, assets	0	0	0	0
Sales, assets	(45)	(33)	(102)	(219)
Settlements, assets	0	0	0	0
Balance at end of period, asset	1,272	1,656	1,272	1,656
Unrealized gains (losses) still held, assets	17	40	35	45
Investments | Foreign government
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	358	141	186	260
Net realized/unrealized gains (losses) included in principal transactions	0	0	0	0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	(58)	(14)	(47)	5
Transfers into Level 3	0	5	2	38
Transfers out of Level 3, assets	(18)	0	(37)	0
Purchases, assets	122	42	455	145
Issuance, assets	0	0	0	0
Sales, assets	(103)	(29)	(258)	(300)
Settlements, assets	0	0	0	(3)
Balance at end of period, asset	301	145	301	145
Unrealized gains (losses) still held, assets	(7)	(5)	(5)	1
Investments | Corporate
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	156	460	311	603
Net realized/unrealized gains (losses) included in principal transactions	0	0	0	0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	146	42	11	87
Transfers into Level 3	10	1	74	6
Transfers out of Level 3, assets	(2)	(18)	(6)	(63)
Purchases, assets	41	412	224	506
Issuance, assets	0	0	0	0
Sales, assets	(231)	(8)	(494)	(250)
Settlements, assets	0	(365)	0	(365)
Balance at end of period, asset	120	524	120	524
Unrealized gains (losses) still held, assets	0	(1)	0	1
Investments | Equity securities
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	9	128	9	124
Net realized/unrealized gains (losses) included in principal transactions	0	0	0	0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	(1)	11	(1)	11
Transfers into Level 3	0	0	0	4
Transfers out of Level 3, assets	0	0	0	0
Purchases, assets	0	0	0	0
Issuance, assets	0	0	0	0
Sales, assets	(5)	(129)	(5)	(129)
Settlements, assets	0	0	0	0
Balance at end of period, asset	3	10	3	10
Unrealized gains (losses) still held, assets	0	0	0	0
Investments | Asset-backed securities
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	1,028	597	660	596
Net realized/unrealized gains (losses) included in principal transactions	0	0	0	0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	(280)	(88)	(98)	(53)
Transfers into Level 3	2	3	23	3
Transfers out of Level 3, assets	(7)	(25)	(20)	(48)
Purchases, assets	504	121	864	325
Issuance, assets	0	0	0	0
Sales, assets	(417)	(7)	(599)	(222)
Settlements, assets	0	81	0	81
Balance at end of period, asset	830	682	830	682
Unrealized gains (losses) still held, assets	(134)	88	(134)	(35)
Investments | Other
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	10	5	0	0
Net realized/unrealized gains (losses) included in principal transactions	0	0	0	0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	0	10	0	10
Transfers out of Level 3, assets	0	0	0	0
Purchases, assets	0	1	21	6
Issuance, assets	0	0	0	0
Sales, assets	0	(5)	(11)	(5)
Settlements, assets	0	0	0	0
Balance at end of period, asset	10	11	10	11
Unrealized gains (losses) still held, assets	0	0	0	0
Investments | Non-marketable equity securities
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	939	1,139	1,331	1,135
Net realized/unrealized gains (losses) included in principal transactions	0	0	0	0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	(61)	54	(124)	78
Transfers into Level 3	0	53	2	104
Transfers out of Level 3, assets	0	(23)	0	(23)
Purchases, assets	1	1	10	19
Issuance, assets	0	0	0	0
Sales, assets	(1)	(14)	(228)	(14)
Settlements, assets	(49)	(29)	(162)	(118)
Balance at end of period, asset	829	1,181	829	1,181
Unrealized gains (losses) still held, assets	(18)	(9)	49	29
Loans
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	577	1,234	568	2,166
Net realized/unrealized gains (losses) included in principal transactions	0	0	0	0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	73	89	57	31
Transfers into Level 3	0	24	80	113
Transfers out of Level 3, assets	0	(196)	(16)	(734)
Purchases, assets	131	93	173	663
Issuance, assets	0	0	0	219
Sales, assets	(236)	(137)	(312)	(812)
Settlements, assets	(1)	(25)	(6)	(564)
Balance at end of period, asset	544	1,082	544	1,082
Unrealized gains (losses) still held, assets	264	(179)	266	383
Mortgage servicing rights
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	560	1,324	1,564	1,781
Net realized/unrealized gains (losses) included in principal transactions	0	0	0	0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	(6)	13	50	(349)
Transfers into Level 3	0	0	0	0
Transfers out of Level 3, assets	0	0	0	0
Purchases, assets	0	0	0	0
Issuance, assets	19	43	75	111
Sales, assets	0	(32)	(1,046)	(18)
Settlements, assets	(20)	(78)	(90)	(255)
Balance at end of period, asset	553	1,270	553	1,270
Unrealized gains (losses) still held, assets	3	15	(40)	(154)
Other financial assets measured on a recurring basis
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	17	111	34	180
Net realized/unrealized gains (losses) included in principal transactions	0	0	0	0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	13	31	(147)	64
Transfers into Level 3	0	1	3	41
Transfers out of Level 3, assets	0	(41)	(8)	(46)
Purchases, assets	1	1	1	1
Issuance, assets	43	72	303	202
Sales, assets	(4)	(4)	(8)	(128)
Settlements, assets	(56)	(105)	(164)	(248)
Balance at end of period, asset	14	66	14	66
Unrealized gains (losses) still held, assets	$ 17	$ (69)	$ (68)	$ (260)