FAIR VALUE MEASUREMENT - Level 3 Fair Value Rollforward (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
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	$ (869)	$ (169)	$ (1,207)	$ (1,715)
Net realized/unrealized gains (losses) included in principal transactions	625	(90)	1,289	42
Other	0	0	0	0
Transfers into Level 3	(499)	(66)	(891)	1,332
Transfers out of Level 3	924	(33)	1,459	(216)
Purchases	199	64	538	205
Issuances	0	78	(84)	134
Sales	(151)	(95)	(720)	(145)
Settlements	(451)	(661)	(606)	(609)
Balance at end of period, asset (liability), net	(222)	(972)	(222)	(972)
Unrealized gains (losses) still held	515	(186)	107	61
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	1,764	1,968	1,614	1
Net realized/unrealized gains (losses) included in principal transactions	(160)	70	(458)	445
Other	0	0	0	0
Transfers into Level 3	(79)	(17)	94	1,597
Transfers out of Level 3	56	(7)	377	(9)
Purchases	10	31	12	33
Issuances	0	78	(84)	134
Sales	0	(62)	0	(49)
Settlements	(100)	(525)	(64)	(616)
Balance at end of period, asset (liability), net	1,491	1,536	1,491	1,536
Unrealized gains (losses) still held	(189)	50	(216)	365
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)	(26)	52	(5)
Net realized/unrealized gains (losses) included in principal transactions	131	122	52	70
Other	0	0	0	0
Transfers into Level 3	(71)	(23)	(63)	(56)
Transfers out of Level 3	(22)	29	(18)	40
Purchases	11	3	145	52
Issuances	0	0	0	0
Sales	(3)	(6)	(300)	(19)
Settlements	(70)	(74)	(76)	(57)
Balance at end of period, asset (liability), net	(208)	25	(208)	25
Unrealized gains (losses) still held	121	47	53	339
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	(2,550)	(2,235)	(3,213)	(1,596)
Net realized/unrealized gains (losses) included in principal transactions	538	(183)	1,150	(747)
Other	0	0	0	0
Transfers into Level 3	(370)	(41)	(968)	(432)
Transfers out of Level 3	668	(69)	1,566	167
Purchases	134	1	243	25
Issuances	0	0	0	0
Sales	(98)	(12)	(215)	(18)
Settlements	(295)	(120)	(536)	(58)
Balance at end of period, asset (liability), net	(1,973)	(2,659)	(1,973)	(2,659)
Unrealized gains (losses) still held	452	(160)	237	(658)
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation
Transfers into Level 3, liabilities			1,000
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	142	(278)	292	(59)
Net realized/unrealized gains (losses) included in principal transactions	200	172	750	(34)
Other	0	0	0	0
Transfers into Level 3	(3)	48	7	85
Transfers out of Level 3	106	(5)	(511)	(75)
Purchases	44	29	138	95
Issuances	0	0	0	0
Sales	(50)	(15)	(205)	(59)
Settlements	(21)	24	(53)	22
Balance at end of period, asset (liability), net	418	(25)	418	(25)
Unrealized gains (losses) still held	218	151	272	(34)
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	(41)	402	48	(56)
Net realized/unrealized gains (losses) included in principal transactions	(84)	(271)	(205)	308
Other	0	0	0	0
Transfers into Level 3	24	(33)	39	138
Transfers out of Level 3	116	19	45	(339)
Purchases	0	0	0	0
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	35	34	123	100
Balance at end of period, asset (liability), net	50	151	50	151
Unrealized gains (losses) still held	(87)	(274)	(239)	49
Interest-bearing deposits
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, liability	154	237	206	215
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	(25)	26	(7)	15
Transfers into Level 3, liabilities	0	0	0	278
Transfers out of Level 3, liabilities	0	0	(44)	(151)
Purchases, liability	0	0	0	0
Issuance, liability	14	4	34	34
Sales, liability	0	0	0	0
Settlements, liability	(11)	(2)	(21)	(148)
Balance at end of period, liability	182	213	182	213
Unrealized gains (losses) still held, liabilities	5	23	(146)	(122)
Securities loaned and sold under agreements to repurchase
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, liability	488	625	631	757
Net realized/unrealized gains (losses) included in principal transactions, liabilities	(29)	(34)	(22)	(7)
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities	0	0	0	0
Transfers into Level 3, liabilities	183	0	183	0
Transfers out of Level 3, liabilities	0	0	(483)	0
Purchases, liability	0	0	488	0
Issuance, liability	0	0	0	0
Sales, liability	0	0	0	0
Settlements, liability	(44)	0	(185)	(105)
Balance at end of period, liability	656	659	656	659
Unrealized gains (losses) still held, liabilities	6	(126)	25	(159)
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	168	104	214	48
Net realized/unrealized gains (losses) included in principal transactions, liabilities	(22)	3	39	(126)
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities	0	0	0	0
Transfers into Level 3, liabilities	7	54	69	171
Transfers out of Level 3, liabilities	(4)	(3)	(29)	(21)
Purchases, liability	21	0	41	0
Issuance, liability	0	0	0	9
Sales, liability	0	0	0	0
Settlements, liability	(126)	(11)	(168)	(192)
Balance at end of period, liability	88	141	88	141
Unrealized gains (losses) still held, liabilities	4	0	4	(40)
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	1	0	26	0
Net realized/unrealized gains (losses) included in principal transactions, liabilities	1	(16)	26	(16)
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities	0	0	0	0
Transfers into Level 3, liabilities	0	27	0	27
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	43	0	43
Unrealized gains (losses) still held, liabilities	4	(15)	0	(15)
Short-term borrowings
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, liability	41	128	219	13
Net realized/unrealized gains (losses) included in principal transactions, liabilities	(1)	9	31	28
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities	0	0	0	0
Transfers into Level 3, liabilities	2	78	44	164
Transfers out of Level 3, liabilities	(12)	0	(56)	(6)
Purchases, liability	0	0	0	0
Issuance, liability	2	11	27	72
Sales, liability	0	0	0	0
Settlements, liability	(31)	(7)	(200)	(14)
Balance at end of period, liability	3	201	3	201
Unrealized gains (losses) still held, liabilities	2	13	2	15
Long-term debt
Fair value, Derivative assets (liabilities) measured on recurring basis, level 3 fair-value category reconciliation
Transfers out of Level 3	1,100		7,100
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, liability	25,068	21,633	25,210	17,169
Net realized/unrealized gains (losses) included in principal transactions, liabilities	486	(267)	2,259	(647)
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities	0	0	0	0
Transfers into Level 3, liabilities	2,052	1,396	6,921	6,459
Transfers out of Level 3, liabilities	(1,086)	(27)	(7,054)	(4,195)
Purchases, liability	0	0	0	0
Issuance, liability	1,526	1,308	9,071	8,096
Sales, liability	0	0	0	0
Settlements, liability	(1,032)	(1,461)	(5,847)	(5,060)
Balance at end of period, liability	26,042	23,116	26,042	23,116
Unrealized gains (losses) still held, liabilities	434	(234)	1,305	(487)
Other financial liabilities
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, liability	4	0	1	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	(3)	0
Transfers into Level 3, liabilities	0	0	0	0
Transfers out of Level 3, liabilities	0	0	(4)	0
Purchases, liability	0	0	0	0
Issuance, liability	0	2	14	4
Sales, liability		0	0	0
Settlements, liability	(3)	0	(13)	(2)
Balance at end of period, liability	1	2	1	2
Unrealized gains (losses) still held, liabilities	0	3	0	0
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	211	326	320	303
Net realized/unrealized gains (losses) included in principal transactions	1	4	(10)	18
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	45	0	45	0
Transfers out of Level 3, assets	0	0	(49)	0
Purchases, assets	43	43	319	151
Issuance, assets	0	0	0	0
Sales, assets	0	0	0	0
Settlements, assets	(43)	(43)	(368)	(142)
Balance at end of period, asset	257	330	257	330
Unrealized gains (losses) still held, assets	3	4	25	4
Trading non-derivative assets
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	2,986	3,962	3,647	2,455
Net realized/unrealized gains (losses) included in principal transactions	306	9	743	336
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	420	363	1,451	1,544
Transfers out of Level 3, assets	(376)	(177)	(1,087)	(536)
Purchases, assets	1,084	891	3,291	3,224
Issuance, assets	0	7	4	21
Sales, assets	(1,378)	(1,257)	(5,003)	(3,225)
Settlements, assets	0	(4)	(4)	(25)
Balance at end of period, asset	3,042	3,794	3,042	3,794
Unrealized gains (losses) still held, assets	67	(58)	49	(301)
Trading non-derivative assets | Mortgage securitizations - U.S. agency-sponsored
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	376	96	27	10
Net realized/unrealized gains (losses) included in principal transactions	20	9	21	(65)
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	60	5	312	21
Transfers out of Level 3, assets	(52)	0	(60)	(9)
Purchases, assets	154	182	268	390
Issuance, assets	0	0	0	0
Sales, assets	(126)	(26)	(136)	(81)
Settlements, assets	0	0	0	0
Balance at end of period, asset	432	266	432	266
Unrealized gains (losses) still held, assets	17	9	31	14
Trading non-derivative assets | Residential
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	95	433	340	123
Net realized/unrealized gains (losses) included in principal transactions	2	64	24	70
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	5	10	74	214
Transfers out of Level 3, assets	(9)	(17)	(77)	(60)
Purchases, assets	19	67	220	341
Issuance, assets	0	0	0	0
Sales, assets	(51)	(288)	(520)	(419)
Settlements, assets	0	0	0	0
Balance at end of period, asset	61	269	61	269
Unrealized gains (losses) still held, assets	3	(1)	17	(6)
Trading non-derivative assets | Commercial
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	87	217	136	61
Net realized/unrealized gains (losses) included in principal transactions	1	1	22	5
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	17	13	93	156
Transfers out of Level 3, assets	(12)	0	(53)	(17)
Purchases, assets	36	24	60	113
Issuance, assets	0	0	0	0
Sales, assets	(9)	(74)	(138)	(137)
Settlements, assets	0	0	0	0
Balance at end of period, asset	120	181	120	181
Unrealized gains (losses) still held, assets	1	0	2	(13)
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	558	746	503	194
Net realized/unrealized gains (losses) included in principal transactions	23	74	67	10
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	82	28	479	391
Transfers out of Level 3, assets	(73)	(17)	(190)	(86)
Purchases, assets	209	273	548	844
Issuance, assets	0	0	0	0
Sales, assets	(186)	(388)	(794)	(637)
Settlements, assets	0	0	0	0
Balance at end of period, asset	613	716	613	716
Unrealized gains (losses) still held, assets	21	8	50	(5)
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	0	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	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	0	0	0	0
Unrealized gains (losses) still held, assets	0	0	0	0
Trading non-derivative assets | State and municipal
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	70	117	94	64
Net realized/unrealized gains (losses) included in principal transactions	3	0	3	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	15
Transfers out of Level 3, assets	0	0	(29)	(3)
Purchases, assets	0	0	5	62
Issuance, assets	0	0	0	0
Sales, assets	(2)	(41)	(2)	(64)
Settlements, assets	0	0	0	0
Balance at end of period, asset	71	76	71	76
Unrealized gains (losses) still held, assets	4	0	4	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	141	26	51	52
Net realized/unrealized gains (losses) included in principal transactions	26	1	31	(27)
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	7	4	143	6
Transfers out of Level 3, assets	(98)	0	(126)	(2)
Purchases, assets	6	26	77	130
Issuance, assets	0	0	0	0
Sales, assets	(49)	(16)	(143)	(118)
Settlements, assets	0	0	0	0
Balance at end of period, asset	33	41	33	41
Unrealized gains (losses) still held, assets	4	0	4	0
Trading non-derivative assets | Corporate
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	823	399	375	313
Net realized/unrealized gains (losses) included in principal transactions	3	(25)	78	265
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	123	22	441	108
Transfers out of Level 3, assets	(110)	(57)	(278)	(127)
Purchases, assets	246	160	721	579
Issuance, assets	0	2	0	2
Sales, assets	(544)	(227)	(796)	(860)
Settlements, assets	0	0	0	(6)
Balance at end of period, asset	541	274	541	274
Unrealized gains (losses) still held, assets	16	(16)	(6)	7
Trading non-derivative assets | Marketable equity securities
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	147	92	73	100
Net realized/unrealized gains (losses) included in principal transactions	12	(31)	59	(22)
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	55	2	139	40
Transfers out of Level 3, assets	(9)	0	(51)	(3)
Purchases, assets	58	15	93	221
Issuance, assets	0	0	0	0
Sales, assets	(58)	(13)	(108)	(271)
Settlements, assets	0	0	0	0
Balance at end of period, asset	205	65	205	65
Unrealized gains (losses) still held, assets	14	(25)	26	(33)
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	692	1,785	1,606	1,177
Net realized/unrealized gains (losses) included in principal transactions	101	14	349	(88)
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	128	167	163	663
Transfers out of Level 3, assets	(19)	(1)	(217)	(61)
Purchases, assets	186	351	1,120	1,091
Issuance, assets	0	0	0	0
Sales, assets	(424)	(488)	(2,357)	(954)
Settlements, assets	0	0	0	0
Balance at end of period, asset	664	1,828	664	1,828
Unrealized gains (losses) still held, assets	(28)	4	(58)	(208)
Trading non-derivative assets | Other debt securities
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	555	797	945	555
Net realized/unrealized gains (losses) included in principal transactions	138	(24)	156	196
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	25	140	86	321
Transfers out of Level 3, assets	(67)	(102)	(196)	(254)
Purchases, assets	379	66	727	297
Issuance, assets	0	5	4	19
Sales, assets	(115)	(84)	(803)	(321)
Settlements, assets	0	(4)	(4)	(19)
Balance at end of period, asset	915	794	915	794
Unrealized gains (losses) still held, assets	36	(29)	29	(63)
Investments
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	2,246	1,496	1,542	1,259
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	(69)	10	(68)	(45)
Transfers into Level 3	235	2	824	390
Transfers out of Level 3, assets	(283)	(2)	(680)	(348)
Purchases, assets	120	85	801	553
Issuance, assets	0	3	0	3
Sales, assets	(96)	(142)	(266)	(305)
Settlements, assets	0	0	0	(55)
Balance at end of period, asset	2,153	1,452	2,153	1,452
Unrealized gains (losses) still held, assets	(65)	21	(145)	23
Investments | Mortgage securitizations - U.S. agency-sponsored
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	52	30	30	32
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	(5)
Transfers into Level 3	20	0	42	1
Transfers out of Level 3, assets	(10)	0	(10)	1
Purchases, assets	0	0	3	1
Issuance, assets	0	0	0	0
Sales, assets	(10)	0	(15)	0
Settlements, assets	0	0	0	0
Balance at end of period, asset	52	30	52	30
Unrealized gains (losses) still held, assets	0	(27)	(53)	(64)
Investments | Residential
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	0	0	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	12	0	12	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	12	0	12	0
Unrealized gains (losses) still held, assets	0	8	0	8
Investments | Commercial
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset		0		0
Net realized/unrealized gains (losses) included in principal transactions		0		0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets		0		0
Transfers into Level 3		0		0
Transfers out of Level 3, assets		0		0
Purchases, assets		0		0
Issuance, assets		0		0
Sales, assets		0		0
Settlements, assets		0		0
Balance at end of period, asset		0		0
Unrealized gains (losses) still held, assets		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	52	30	30	32
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	(5)
Transfers into Level 3	20	0	42	1
Transfers out of Level 3, assets	(10)	0	(10)	1
Purchases, assets	12	0	15	1
Issuance, assets	0	0	0	0
Sales, assets	(10)	0	(15)	0
Settlements, assets	0	0	0	0
Balance at end of period, asset	64	30	64	30
Unrealized gains (losses) still held, assets	0	(19)	(53)	(56)
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	0	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	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	0	0	0	0
Unrealized gains (losses) still held, assets	0	0	0	0
Investments | State and municipal
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	748	825	834	623
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)	(5)	(16)	(12)
Transfers into Level 3	0	2	58	312
Transfers out of Level 3, assets	0	0	(108)	(131)
Purchases, assets	2	19	5	114
Issuance, assets	0	0	0	0
Sales, assets	(9)	(16)	(38)	(81)
Settlements, assets	0	0	0	0
Balance at end of period, asset	735	825	735	825
Unrealized gains (losses) still held, assets	(6)	25	(12)	50
Investments | Foreign government
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	957	196	268	96
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)	3	(24)	8
Transfers into Level 3	63	0	503	27
Transfers out of Level 3, assets	(232)	0	(521)	(64)
Purchases, assets	99	66	744	274
Issuance, assets	0	0	0	0
Sales, assets	(50)	(76)	(158)	(152)
Settlements, assets	0	0	0	0
Balance at end of period, asset	812	189	812	189
Unrealized gains (losses) still held, assets	(6)	0	(4)	0
Investments | Corporate
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	104	106	60	45
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)	0	(13)	2
Transfers into Level 3	151	0	183	49
Transfers out of Level 3, assets	(41)	0	(41)	(152)
Purchases, assets	7	0	37	162
Issuance, assets	0	0	0	0
Sales, assets	(27)	(50)	(34)	(50)
Settlements, assets	0	0	0	0
Balance at end of period, asset	192	56	192	56
Unrealized gains (losses) still held, assets	0	0	2	0
Investments | Marketable equity securities
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	0	1		0
Net realized/unrealized gains (losses) included in principal transactions	0	0		0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	(1)		(1)
Transfers into Level 3	0	0		1
Transfers out of Level 3, assets	0	0		0
Purchases, assets	0	0		0
Issuance, assets	0	0		0
Sales, assets	0	0		0
Settlements, assets	0	0		0
Balance at end of period, asset	0	0	0	0
Unrealized gains (losses) still held, assets	0	(1)		(1)
Investments | Asset-backed securities
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	3	6	1	22
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	(4)	(21)	(1)
Transfers into Level 3	0	0	36	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	0	(13)	(19)
Settlements, assets	0	0	0	0
Balance at end of period, asset	3	2	3	2
Unrealized gains (losses) still held, assets	0	0	(25)	6
Investments | Other debt securities
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	0	0		0
Net realized/unrealized gains (losses) included in principal transactions	0	0		0
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0		0
Transfers into Level 3	0	0		0
Transfers out of Level 3, assets	0	0		0
Purchases, assets	0	0		0
Issuance, assets	0	0		0
Sales, assets	0	0		0
Settlements, assets	0	0		0
Balance at end of period, asset	0	0	0	0
Unrealized gains (losses) still held, assets	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	382	332	349	441
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	(36)	17	4	(36)
Transfers into Level 3	1	0	2	0
Transfers out of Level 3, assets	0	(2)	0	(2)
Purchases, assets	0	0	0	2
Issuance, assets	0	3	0	3
Sales, assets	0	0	(8)	(3)
Settlements, assets	0	0	0	(55)
Balance at end of period, asset	347	350	347	350
Unrealized gains (losses) still held, assets	(53)	16	(53)	24
Loans
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	429	978	1,985	402
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	(16)	567	332	935
Transfers into Level 3	0	138	271	355
Transfers out of Level 3, assets	(20)	0	(2,071)	(6)
Purchases, assets	0	0	0	0
Issuance, assets	336	0	337	0
Sales, assets	0	0	0	0
Settlements, assets	(7)	(2)	(132)	(5)
Balance at end of period, asset	722	1,681	722	1,681
Unrealized gains (losses) still held, assets	14	573	111	1,026
Fair value, Derivative assets (liabilities) measured on recurring basis, level 3 fair-value category reconciliation
Transfers out of Level 3			(2,000)
Mortgage servicing rights
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	419	345	336	495
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)	(22)	49	(191)
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	8	31	76	87
Sales, assets	0	0	0	0
Settlements, assets	(15)	(20)	(52)	(57)
Balance at end of period, asset	409	334	409	334
Unrealized gains (losses) still held, assets	(3)	(14)	50	(161)
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	55	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	3	(3)	3	11
Transfers into Level 3	10	19	65	19
Transfers out of Level 3, assets	(4)	0	(4)	0
Purchases, assets	33	0	33	0
Issuance, assets	0	(13)	0	(19)
Sales, assets	(11)	(3)	(11)	(8)
Settlements, assets	0	0	0	(4)
Balance at end of period, asset	86	0	86	0
Unrealized gains (losses) still held, assets	$ 0	$ (11)	$ 0	$ 9