FAIR VALUE MEASUREMENT - Level 3 Fair Value Rollforward (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
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	$ (3,875)	$ (5,114)	$ (4,979)	$ (4,753)
Net realized/unrealized gains (losses) included in principal transactions	(48)	(93)	270	(1,398)
Transfers into Level 3	15	(51)	(118)	(18)
Transfers out of Level 3	417	63	1,209	706
Purchases	19	57	80	307
Issuances	(7)	0	(7)	0
Sales	(77)	(152)	(108)	(526)
Settlements	139	109	236	501
Balance at end of period, asset (liability), net	(3,417)	(5,181)	(3,417)	(5,181)
Unrealized gains (losses) still held	61	(422)	120	(543)
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	86	(288)	(422)	(663)
Net realized/unrealized gains (losses) included in principal transactions	10	196	597	4
Transfers into Level 3	(11)	4	(6)	(24)
Transfers out of Level 3	(2)	(4)	(74)	647
Purchases	0	25	8	90
Issuances	8	0	8	0
Sales	0	(20)	(16)	(225)
Settlements	28	(114)	24	(30)
Balance at end of period, asset (liability), net	119	(201)	119	(201)
Unrealized gains (losses) still held	59	120	540	65
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	239	184	130	413
Net realized/unrealized gains (losses) included in principal transactions	(16)	(92)	89	(389)
Transfers into Level 3	(15)	1	(28)	54
Transfers out of Level 3	56	(4)	59	(63)
Purchases	4	(6)	11	32
Issuances	0	0	0	0
Sales	(66)	(3)	(71)	(37)
Settlements	(13)	68	(1)	138
Balance at end of period, asset (liability), net	189	148	189	148
Unrealized gains (losses) still held	(51)	(92)	52	(134)
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	(1,446)	(1,647)	(2,027)	(1,557)
Net realized/unrealized gains (losses) included in principal transactions	265	201	163	98
Transfers into Level 3	3	(52)	(70)	(34)
Transfers out of Level 3	372	(34)	1,123	(8)
Purchases	3	31	20	180
Issuances	(15)	0	(15)	0
Sales	(3)	(126)	(14)	(263)
Settlements	(93)	(221)	(94)	(264)
Balance at end of period, asset (liability), net	(914)	(1,848)	(914)	(1,848)
Unrealized gains (losses) still held	283	(10)	66	(22)
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	(1,906)	(2,024)	(1,861)	(1,945)
Net realized/unrealized gains (losses) included in principal transactions	(67)	(248)	(241)	(576)
Transfers into Level 3	44	(29)	1	29
Transfers out of Level 3	(16)	(10)	82	39
Purchases	12	0	39	0
Issuances	0	0	0	0
Sales	(8)	(3)	(8)	(3)
Settlements	136	(25)	183	117
Balance at end of period, asset (liability), net	(1,805)	(2,339)	(1,805)	(2,339)
Unrealized gains (losses) still held	1	(255)	(70)	(255)
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	(848)	(1,339)	(799)	(1,001)
Net realized/unrealized gains (losses) included in principal transactions	(240)	(150)	(338)	(535)
Transfers into Level 3	(6)	25	(15)	(43)
Transfers out of Level 3	7	115	19	91
Purchases	0	7	2	5
Issuances	0	0	0	0
Sales	0	0	1	2
Settlements	81	401	124	540
Balance at end of period, asset (liability), net	(1,006)	(941)	(1,006)	(941)
Unrealized gains (losses) still held	(231)	(185)	(468)	(197)
Interest-bearing deposits
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, liability	320	300	286	293
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	14	(2)	37	9
Transfers into Level 3, liabilities	0	0	12	40
Transfers out of Level 3, liabilities	0	0	0	0
Purchases, liability	0	0	0	0
Issuance, liability	0	0	45	0
Sales, liability	0	0	0	0
Settlements, liability	(3)	(2)	(3)	(24)
Balance at end of period, liability	303	300	303	300
Unrealized gains (losses) still held, liabilities	14	6	(104)	6
Federal funds purchased and securities loaned and sold under agreement to repurchase
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, liability	966	807	726	849
Net realized/unrealized gains (losses) included in principal transactions, liabilities	(31)	(1)	8	7
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	0	0	0
Purchases, liability	0	0	0	0
Issuance, liability	0	0	243	0
Sales, liability	0	0	0	0
Settlements, liability	0	(43)	36	(77)
Balance at end of period, liability	997	765	997	765
Unrealized gains (losses) still held, liabilities	24	4	52	4
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	189	1,143	22	1,177
Net realized/unrealized gains (losses) included in principal transactions, liabilities	(137)	496	(384)	490
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities	0	0	0	0
Transfers into Level 3, liabilities	28	5	35	18
Transfers out of Level 3, liabilities	(55)	(10)	(86)	(53)
Purchases, liability	(14)	0	(14)	0
Issuance, liability	121	0	121	0
Sales, liability	(45)	88	(36)	265
Settlements, liability	(2)	(46)	(67)	(233)
Balance at end of period, liability	387	684	387	684
Unrealized gains (losses) still held, liabilities	(90)	24	(128)	24
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		5
Net realized/unrealized gains (losses) included in principal transactions, liabilities	0		5
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities	0		0
Transfers into Level 3, liabilities	0		0
Transfers out of Level 3, liabilities	0		0
Purchases, liability	0		0
Issuance, liability	0		0
Sales, liability	0		0
Settlements, liability	0		0
Balance at end of period, liability	0		0
Unrealized gains (losses) still held, liabilities	0		0
Short-term borrowings
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, liability	90	29	18	42
Net realized/unrealized gains (losses) included in principal transactions, liabilities	1	(13)	2	18
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities	0	0	0	0
Transfers into Level 3, liabilities	0	3	48	4
Transfers out of Level 3, liabilities	(18)	(1)	(39)	(1)
Purchases, liability	0	0	0	0
Issuance, liability	5	12	54	31
Sales, liability	0	0	0	0
Settlements, liability	(37)	0	(40)	(2)
Balance at end of period, liability	39	56	39	56
Unrealized gains (losses) still held, liabilities	19	7	22	7
Long-term debt
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, liability	13,781	11,831	13,082	9,744
Net realized/unrealized gains (losses) included in principal transactions, liabilities	(231)	1,057	(474)	456
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities	0	0	0	0
Transfers into Level 3, liabilities	445	181	2,200	702
Transfers out of Level 3, liabilities	(646)	(490)	(1,950)	(1,457)
Purchases, liability	0	0	(36)	0
Issuance, liability	(42)	419	(35)	2,701
Sales, liability	(1)	0	(45)	0
Settlements, liability	23	437	29	87
Balance at end of period, liability	13,791	11,321	13,791	11,321
Unrealized gains (losses) still held, liabilities	(298)	716	(1,709)	708
Other financial liabilities
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, liability	0	2	8	8
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	(2)	0
Transfers into Level 3, liabilities	0	0	1	0
Transfers out of Level 3, liabilities	0	0	(10)	0
Purchases, liability	0	0	0	0
Issuance, liability	0	1	2	3
Sales, liability	0	0	0	(1)
Settlements, liability	0	(1)	(3)	(8)
Balance at end of period, liability	0	2	0	2
Unrealized gains (losses) still held, liabilities	0	(1)	(9)	(1)
Federal funds sold and securities borrowed and purchased under agreements to resell
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	66	1,002	16	1,496
Net realized/unrealized gains (losses) included in principal transactions	0	(338)	19	(340)
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	(1)	0	48	0
Transfers out of Level 3, assets	0	0	0	(491)
Purchases, assets	61	0	61	0
Issuance, assets	0	0	0	0
Sales, assets	0	0	0	0
Settlements, assets	(61)	0	(79)	(1)
Balance at end of period, asset	65	664	65	664
Unrealized gains (losses) still held, assets	4	(338)	10	0
Trading non-derivative assets
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	3,594	5,255	3,274	6,251
Net realized/unrealized gains (losses) included in principal transactions	(127)	391	223	772
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	169	204	543	1,185
Transfers out of Level 3, assets	(196)	(826)	(660)	(2,048)
Purchases, assets	725	2,441	2,434	5,062
Issuance, assets	2	4	7	5
Sales, assets	(898)	(1,846)	(2,543)	(5,589)
Settlements, assets	(5)	(4)	(14)	(19)
Balance at end of period, asset	3,264	5,619	3,264	5,619
Unrealized gains (losses) still held, assets	(57)	178	(9)	279
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	99	204	163	176
Net realized/unrealized gains (losses) included in principal transactions	(2)	0	0	4
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	3	75	92	154
Transfers out of Level 3, assets	(7)	(21)	(97)	(86)
Purchases, assets	38	174	191	438
Issuance, assets	0	0	0	0
Sales, assets	(3)	(123)	(221)	(377)
Settlements, assets	0	0	0	0
Balance at end of period, asset	128	309	128	309
Unrealized gains (losses) still held, assets	(2)	0	0	1
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	132	327	164	399
Net realized/unrealized gains (losses) included in principal transactions	111	24	116	61
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	17	41	75	88
Transfers out of Level 3, assets	(36)	(9)	(124)	(58)
Purchases, assets	8	39	99	105
Issuance, assets	0	0	0	0
Sales, assets	(17)	(71)	(115)	(244)
Settlements, assets	0	0	0	0
Balance at end of period, asset	215	351	215	351
Unrealized gains (losses) still held, assets	(2)	12	(1)	35
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	51	318	57	206
Net realized/unrealized gains (losses) included in principal transactions	(2)	10	(3)	7
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	4	22	15	66
Transfers out of Level 3, assets	(8)	(17)	(45)	(46)
Purchases, assets	29	11	67	445
Issuance, assets	0	0	0	0
Sales, assets	(17)	(232)	(34)	(566)
Settlements, assets	0	0	0	0
Balance at end of period, asset	57	112	57	112
Unrealized gains (losses) still held, assets	(1)	5	2	(5)
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	282	849	384	781
Net realized/unrealized gains (losses) included in principal transactions	107	34	113	72
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	24	138	182	308
Transfers out of Level 3, assets	(51)	(47)	(266)	(190)
Purchases, assets	75	224	357	988
Issuance, assets	0	0	0	0
Sales, assets	(37)	(426)	(370)	(1,187)
Settlements, assets	0	0	0	0
Balance at end of period, asset	400	772	400	772
Unrealized gains (losses) still held, assets	(5)	17	1	31
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	7	0	0	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	6	0
Transfers out of Level 3, assets	0	0	0	0
Purchases, assets	0	0	1	0
Issuance, assets	0	0	0	0
Sales, assets	0	0	0	(1)
Settlements, assets	(1)	0	(1)	0
Balance at end of period, asset	6	0	6	0
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	226	284	274	296
Net realized/unrealized gains (losses) included in principal transactions	6	(2)	16	3
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	0	0	0	24
Transfers out of Level 3, assets	(52)	0	(96)	(48)
Purchases, assets	22	49	35	137
Issuance, assets	0	0	0	0
Sales, assets	(2)	(61)	(29)	(142)
Settlements, assets	0	0	0	0
Balance at end of period, asset	200	270	200	270
Unrealized gains (losses) still held, assets	6	(1)	8	(1)
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	36	108	16	40
Net realized/unrealized gains (losses) included in principal transactions	27	(5)	26	2
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	0	4	2	88
Transfers out of Level 3, assets	(8)	(114)	(13)	(204)
Purchases, assets	4	161	50	288
Issuance, assets	0	0	0	0
Sales, assets	(7)	(59)	(29)	(119)
Settlements, assets	0	0	0	0
Balance at end of period, asset	52	95	52	95
Unrealized gains (losses) still held, assets	26	(2)	26	(1)
Trading non-derivative assets | Corporate
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	520	401	275	324
Net realized/unrealized gains (losses) included in principal transactions	(214)	105	(119)	320
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	24	16	85	132
Transfers out of Level 3, assets	(15)	(11)	(106)	(84)
Purchases, assets	110	148	389	424
Issuance, assets	0	0	0	0
Sales, assets	(172)	(268)	(271)	(725)
Settlements, assets	0	0	0	0
Balance at end of period, asset	253	391	253	391
Unrealized gains (losses) still held, assets	7	103	(1)	167
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	293	240	120	127
Net realized/unrealized gains (losses) included in principal transactions	(87)	183	(5)	212
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	7	3	24	135
Transfers out of Level 3, assets	(21)	(41)	(41)	(54)
Purchases, assets	24	29	266	38
Issuance, assets	0	0	0	0
Sales, assets	(46)	(178)	(194)	(222)
Settlements, assets	0	0	0	0
Balance at end of period, asset	170	236	170	236
Unrealized gains (losses) still held, assets	(99)	6	(68)	20
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	1,688	1,570	1,590	1,868
Net realized/unrealized gains (losses) included in principal transactions	(44)	114	31	251
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	20	5	65	28
Transfers out of Level 3, assets	(39)	(6)	(86)	(87)
Purchases, assets	305	481	994	1,185
Issuance, assets	0	0	0	0
Sales, assets	(477)	(460)	(1,141)	(1,541)
Settlements, assets	0	0	0	0
Balance at end of period, asset	1,453	1,704	1,453	1,704
Unrealized gains (losses) still held, assets	(45)	26	(6)	34
Trading non-derivative assets | Other
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	542	1,803	615	2,814
Net realized/unrealized gains (losses) included in principal transactions	78	(38)	161	(88)
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	94	38	179	470
Transfers out of Level 3, assets	(10)	(607)	(52)	(1,381)
Purchases, assets	185	1,349	342	2,002
Issuance, assets	2	4	7	5
Sales, assets	(157)	(394)	(509)	(1,652)
Settlements, assets	(4)	(4)	(13)	(19)
Balance at end of period, asset	730	2,151	730	2,151
Unrealized gains (losses) still held, assets	53	29	31	29
Investments
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	1,992	3,836	2,437	3,861
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	(92)	(244)	(143)	(205)
Transfers into Level 3	163	36	201	175
Transfers out of Level 3, assets	(244)	(35)	(610)	(206)
Purchases, assets	167	684	398	1,674
Issuance, assets	0	0	0	0
Sales, assets	(167)	(803)	(412)	(1,712)
Settlements, assets	0	(49)	(52)	(162)
Balance at end of period, asset	1,819	3,425	1,819	3,425
Unrealized gains (losses) still held, assets	(85)	(114)	(109)	(25)
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	34	50	24	101
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	12	10	15
Transfers into Level 3	0	0	0	1
Transfers out of Level 3, assets	0	(5)	0	(60)
Purchases, assets	0	0	0	0
Issuance, assets	0	0	0	0
Sales, assets	0	0	0	0
Settlements, assets	0	0	0	0
Balance at end of period, asset	34	57	34	57
Unrealized gains (losses) still held, assets	0	28	(12)	30
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	0	0	50
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	2
Transfers into Level 3	0	0	0	0
Transfers out of Level 3, assets	0	0	0	(47)
Purchases, assets	0	0	0	0
Issuance, assets	0	0	0	0
Sales, assets	0	0	0	(5)
Settlements, assets	0	0	0	0
Balance at end of period, asset	0	0	0	0
Unrealized gains (losses) still held, assets	0	0	0	0
Investments | Mortgage-backed securities - Commercial
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	6	0	3	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	2	0
Transfers into Level 3	0	3	1	3
Transfers out of Level 3, assets	(1)	0	(1)	0
Purchases, assets	0	0	0	8
Issuance, assets	0	0	0	0
Sales, assets	0	0	0	(8)
Settlements, assets	0	0	0	0
Balance at end of period, asset	5	3	5	3
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	40	50	27	151
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	12	12	17
Transfers into Level 3	0	3	1	4
Transfers out of Level 3, assets	(1)	(5)	(1)	(107)
Purchases, assets	0	0	0	8
Issuance, assets	0	0	0	0
Sales, assets	0	0	0	(13)
Settlements, assets	0	0	0	0
Balance at end of period, asset	39	60	39	60
Unrealized gains (losses) still held, assets	0	28	(12)	30
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	0	1	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	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	0	(1)	0	(2)
Settlements, assets	0	0	0	0
Balance at end of period, asset	0	0	0	0
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	762	1,285	737	1,211
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	(10)	(2)	(23)	37
Transfers into Level 3	0	21	0	70
Transfers out of Level 3, assets	0	(3)	(18)	(36)
Purchases, assets	17	16	157	92
Issuance, assets	0	0	0	0
Sales, assets	(87)	(45)	(171)	(102)
Settlements, assets	0	0	0	0
Balance at end of period, asset	682	1,272	682	1,272
Unrealized gains (losses) still held, assets	(7)	17	(32)	35
Investments | Foreign government
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	54	358	92	186
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	(3)	(58)	(7)	(47)
Transfers into Level 3	0	0	1	2
Transfers out of Level 3, assets	(2)	(18)	(4)	(37)
Purchases, assets	45	122	107	455
Issuance, assets	0	0	0	0
Sales, assets	(13)	(103)	(108)	(258)
Settlements, assets	0	0	0	0
Balance at end of period, asset	81	301	81	301
Unrealized gains (losses) still held, assets	(3)	(7)	(3)	(5)
Investments | Corporate
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	68	156	71	311
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	146	(1)	11
Transfers into Level 3	0	10	3	74
Transfers out of Level 3, assets	(64)	(2)	(66)	(6)
Purchases, assets	0	41	3	224
Issuance, assets	0	0	0	0
Sales, assets	(4)	(231)	(10)	(494)
Settlements, assets	0	0	0	0
Balance at end of period, asset	0	120	0	120
Unrealized gains (losses) still held, assets	0	0	0	0
Investments | Equity securities
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	1	9	2	9
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	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	0	(5)	(1)	(5)
Settlements, assets	(1)	0	(1)	0
Balance at end of period, asset	0	3	0	3
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	456	1,028	827	660
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)	(280)	(21)	(98)
Transfers into Level 3	0	2	3	23
Transfers out of Level 3, assets	(177)	(7)	(521)	(20)
Purchases, assets	34	504	45	864
Issuance, assets	0	0	0	0
Sales, assets	(23)	(417)	(49)	(599)
Settlements, assets	0	0	0	0
Balance at end of period, asset	284	830	284	830
Unrealized gains (losses) still held, assets	(5)	(134)	(6)	(134)
Investments | Other
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	0	10	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	0	0	0
Transfers out of Level 3, assets	0	0	0	0
Purchases, assets	0	0	0	21
Issuance, assets	0	0	0	0
Sales, assets	0	0	0	(11)
Settlements, assets	0	0	0	0
Balance at end of period, asset	0	10	0	10
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	611	939	681	1,331
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)	(61)	(103)	(124)
Transfers into Level 3	163	0	193	2
Transfers out of Level 3, assets	0	0	0	0
Purchases, assets	71	1	86	10
Issuance, assets	0	0	0	0
Sales, assets	(40)	(1)	(73)	(228)
Settlements, assets	1	(49)	(51)	(162)
Balance at end of period, asset	733	829	733	829
Unrealized gains (losses) still held, assets	(70)	(18)	(56)	49
Loans
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	381	577	550	568
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	(27)	73	(282)	57
Transfers into Level 3	0	0	0	80
Transfers out of Level 3, assets	(46)	0	13	(16)
Purchases, assets	79	131	130	173
Issuance, assets	0	0	0	0
Sales, assets	(3)	(236)	(25)	(312)
Settlements, assets	(1)	(1)	(3)	(6)
Balance at end of period, asset	383	544	383	544
Unrealized gains (losses) still held, assets	95	264	286	266
Mortgage servicing rights
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	596	560	558	1,564
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	25	(6)	82	50
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	14	19	46	75
Sales, assets	0	0	(18)	(1,046)
Settlements, assets	(17)	(20)	(50)	(90)
Balance at end of period, asset	618	553	618	553
Unrealized gains (losses) still held, assets	26	3	83	(40)
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	0	17	16	34
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	15	13	37	(147)
Transfers into Level 3	0	0	0	3
Transfers out of Level 3, assets	0	0	(11)	(8)
Purchases, assets	0	1	4	1
Issuance, assets	0	43	12	303
Sales, assets	(4)	(4)	(8)	(8)
Settlements, assets	(11)	(56)	(50)	(164)
Balance at end of period, asset	0	14	0	14
Unrealized gains (losses) still held, assets	$ 14	$ 17	$ 53	$ (68)