FAIR VALUE MEASUREMENT - Level 3 Fair Value Rollforward (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
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	$ (1,077)	$ (4,427)	$ (901)	$ (4,979)
Net realized/unrealized gains (losses) included in principal transactions	(178)	230	(502)	318
Transfers into Level 3	(74)	(34)	(279)	(133)
Transfers out of Level 3	204	269	497	792
Purchases	47	18	109	61
Issuances	(69)	0	(116)	0
Sales	6	(9)	(30)	(31)
Settlements	(26)	78	55	97
Balance at end of period, asset (liability), net	(1,167)	(3,875)	(1,167)	(3,875)
Unrealized gains (losses) still held	(157)	738	(770)	508
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	(116)	(6)	(154)	(422)
Net realized/unrealized gains (losses) included in principal transactions	(68)	206	(119)	587
Transfers into Level 3	(59)	0	(74)	5
Transfers out of Level 3	137	(109)	164	(72)
Purchases	(21)	1	(15)	8
Issuances	19	0	31	0
Sales	8	0	8	(16)
Settlements	(9)	(6)	50	(4)
Balance at end of period, asset (liability), net	(109)	86	(109)	86
Unrealized gains (losses) still held	(101)	270	(85)	529
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	46	88	(6)	130
Net realized/unrealized gains (losses) included in principal transactions	(109)	167	(49)	105
Transfers into Level 3	15	(12)	0	(13)
Transfers out of Level 3	9	(5)	24	3
Purchases	0	6	3	7
Issuances	0	0	0	0
Sales	(2)	(5)	(6)	(5)
Settlements	(56)	0	(63)	12
Balance at end of period, asset (liability), net	(97)	239	(97)	239
Unrealized gains (losses) still held	(124)	146	(165)	27
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	(1,345)	(1,741)	(784)	(2,027)
Net realized/unrealized gains (losses) included in principal transactions	183	34	(111)	(102)
Transfers into Level 3	(38)	(16)	(192)	(73)
Transfers out of Level 3	100	279	109	751
Purchases	2	4	1	17
Issuances	(88)	0	(147)	0
Sales	(2)	(4)	0	(11)
Settlements	(6)	(2)	(70)	(1)
Balance at end of period, asset (liability), net	(1,194)	(1,446)	(1,194)	(1,446)
Unrealized gains (losses) still held	193	469	(338)	203
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	304	(1,909)	(18)	(1,861)
Net realized/unrealized gains (losses) included in principal transactions	(243)	(141)	37	(174)
Transfers into Level 3	9	4	6	(43)
Transfers out of Level 3	(4)	90	6	98
Purchases	66	7	120	27
Issuances	0	0	0	0
Sales	(12)	0	(46)	0
Settlements	27	43	42	47
Balance at end of period, asset (liability), net	147	(1,906)	147	(1,906)
Unrealized gains (losses) still held	(135)	(118)	153	(32)
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	34	(859)	61	(799)
Net realized/unrealized gains (losses) included in principal transactions	59	(36)	(260)	(98)
Transfers into Level 3	(1)	(10)	(19)	(9)
Transfers out of Level 3	(38)	14	194	12
Purchases	0	0	0	2
Issuances	0	0	0	0
Sales	14	0	14	1
Settlements	18	43	96	43
Balance at end of period, asset (liability), net	86	(848)	86	(848)
Unrealized gains (losses) still held	10	(29)	(335)	(219)
Interest-bearing deposits
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, liability	1,047	292	495	286
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	(39)	(3)	(49)	23
Transfers into Level 3, liabilities	2	0	3	12
Transfers out of Level 3, liabilities	(18)	0	(22)	0
Purchases, liability	0	0	0	0
Issuance, liability	129	25	803	45
Sales, liability	0	0	0	0
Settlements, liability	(17)	0	(146)	0
Balance at end of period, liability	1,182	320	1,182	320
Unrealized gains (losses) still held, liabilities	(211)	6	182	60
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	1,041	857	983	726
Net realized/unrealized gains (losses) included in principal transactions, liabilities	(42)	25	(38)	39
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities	0	0	0	0
Transfers into Level 3, liabilities	2	0	1	0
Transfers out of Level 3, liabilities	0	0	4	0
Purchases, liability	0	0	0	0
Issuance, liability	0	96	0	243
Sales, liability	0	0	1	0
Settlements, liability	0	38	58	36
Balance at end of period, liability	1,085	966	1,085	966
Unrealized gains (losses) still held, liabilities	(13)	(16)	24	(29)
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	15	48	586	22
Net realized/unrealized gains (losses) included in principal transactions, liabilities	(6)	(142)	118	(247)
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities	0	0	0	0
Transfers into Level 3, liabilities	15	4	16	7
Transfers out of Level 3, liabilities	(6)	(12)	(447)	(31)
Purchases, liability	0	0	0	0
Issuance, liability	0	0	0	0
Sales, liability	0	6	0	9
Settlements, liability	(2)	1	(9)	(65)
Balance at end of period, liability	28	189	28	189
Unrealized gains (losses) still held, liabilities	(1)	50	0	46
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	5
Net realized/unrealized gains (losses) included in principal transactions, liabilities	0	0	0	5
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	0	0
Sales, liability	0	0	0	0
Settlements, liability	0	0	0	0
Balance at end of period, liability	0	0	0	0
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	170	81	37	18
Net realized/unrealized gains (losses) included in principal transactions, liabilities	2	(6)	25	1
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities	0	0	0	0
Transfers into Level 3, liabilities	0	3	9	48
Transfers out of Level 3, liabilities	(25)	(21)	(31)	(21)
Purchases, liability	0	0	0	0
Issuance, liability	12	24	165	49
Sales, liability	0	0	0	0
Settlements, liability	(1)	(3)	(1)	(3)
Balance at end of period, liability	154	90	154	90
Unrealized gains (losses) still held, liabilities	(2)	(10)	2	9
Long-term debt
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, liability	13,734	13,484	12,570	13,082
Net realized/unrealized gains (losses) included in principal transactions, liabilities	(819)	(7)	(1,226)	(243)
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities	0	0	0	0
Transfers into Level 3, liabilities	747	815	1,624	1,755
Transfers out of Level 3, liabilities	(1,360)	(540)	(2,961)	(1,304)
Purchases, liability	20	0	20	36
Issuance, liability	900	4	6,850	7
Sales, liability	(1)	0	(4)	(44)
Settlements, liability	79	11	(4,387)	6
Balance at end of period, liability	14,938	13,781	14,938	13,781
Unrealized gains (losses) still held, liabilities	(1,023)	(92)	769	735
Other financial liabilities
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, liability	0	3	0	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	4	(2)	4	(2)
Transfers into Level 3, liabilities	5	1	5	1
Transfers out of Level 3, liabilities	0	(5)	0	(10)
Purchases, liability	0	0	0	0
Issuance, liability	0	0	0	2
Sales, liability	0	0	0	0
Settlements, liability	0	(1)	0	(3)
Balance at end of period, liability	1	0	1	0
Unrealized gains (losses) still held, liabilities	0	0	0	4
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	16	115	16
Net realized/unrealized gains (losses) included in principal transactions	5	1	1	19
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	2	49	5	49
Transfers out of Level 3, assets	0	0	(4)	0
Purchases, assets	49	0	94	0
Issuance, assets	0	0	0	0
Sales, assets	0	0	0	0
Settlements, assets	0	0	(89)	(18)
Balance at end of period, asset	122	66	122	66
Unrealized gains (losses) still held, assets	0	0	3	10
Trading non-derivative assets
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	3,544	3,418	3,548	3,274
Net realized/unrealized gains (losses) included in principal transactions	353	9	413	350
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	68	121	126	374
Transfers out of Level 3, assets	(200)	(147)	(377)	(464)
Purchases, assets	637	888	1,421	1,709
Issuance, assets	5	0	(24)	5
Sales, assets	(1,104)	(691)	(1,799)	(1,645)
Settlements, assets	(7)	(4)	(12)	(9)
Balance at end of period, asset	3,296	3,594	3,296	3,594
Unrealized gains (losses) still held, assets	57	238	69	305
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	154	206	156	163
Net realized/unrealized gains (losses) included in principal transactions	6	1	6	2
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	1	3	1	89
Transfers out of Level 3, assets	(2)	(41)	(27)	(90)
Purchases, assets	42	37	90	153
Issuance, assets	(1)	0	(1)	0
Sales, assets	(13)	(107)	(38)	(218)
Settlements, assets	0	0	0	0
Balance at end of period, asset	187	99	187	99
Unrealized gains (losses) still held, assets	4	1	7	1
Trading non-derivative assets | Residential mortgage
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	128	143	268	164
Net realized/unrealized gains (losses) included in principal transactions	10	(17)	11	5
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	17	23	22	58
Transfers out of Level 3, assets	(9)	(11)	(40)	(88)
Purchases, assets	61	45	130	91
Issuance, assets	0	0	0	0
Sales, assets	(76)	(51)	(260)	(98)
Settlements, assets	0	0	0	0
Balance at end of period, asset	131	132	131	132
Unrealized gains (losses) still held, assets	15	(4)	15	(4)
Trading non-derivative assets | Commercial and other
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	69	35	77	57
Net realized/unrealized gains (losses) included in principal transactions	2	(2)	4	(1)
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	3	7	5	11
Transfers out of Level 3, assets	(34)	(2)	(35)	(37)
Purchases, assets	38	23	62	38
Issuance, assets	0	0	0	0
Sales, assets	(25)	(10)	(60)	(17)
Settlements, assets	0	0	0	0
Balance at end of period, asset	53	51	53	51
Unrealized gains (losses) still held, assets	(6)	(1)	(5)	3
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	351	384	501	384
Net realized/unrealized gains (losses) included in principal transactions	18	(18)	21	6
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	21	33	28	158
Transfers out of Level 3, assets	(45)	(54)	(102)	(215)
Purchases, assets	141	105	282	282
Issuance, assets	(1)	0	(1)	0
Sales, assets	(114)	(168)	(358)	(333)
Settlements, assets	0	0	0	0
Balance at end of period, asset	371	282	371	282
Unrealized gains (losses) still held, assets	13	(4)	17	0
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	1	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	6	0	6
Transfers out of Level 3, assets	0	0	0	0
Purchases, assets	0	1	0	1
Issuance, assets	0	0	0	0
Sales, assets	0	0	0	0
Settlements, assets	0	0	(1)	0
Balance at end of period, asset	0	7	0	7
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	178	211	200	274
Net realized/unrealized gains (losses) included in principal transactions	0	4	(1)	10
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	(19)	(44)
Purchases, assets	0	13	1	13
Issuance, assets	0	0	0	0
Sales, assets	(1)	(2)	(4)	(27)
Settlements, assets	0	0	0	0
Balance at end of period, asset	177	226	177	226
Unrealized gains (losses) still held, assets	0	2	0	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	39	21	31	16
Net realized/unrealized gains (losses) included in principal transactions	2	(1)	1	(1)
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	0	0	9	2
Transfers out of Level 3, assets	0	(5)	0	(5)
Purchases, assets	0	32	3	46
Issuance, assets	0	0	0	0
Sales, assets	(21)	(11)	(24)	(22)
Settlements, assets	0	0	0	0
Balance at end of period, asset	20	36	20	36
Unrealized gains (losses) still held, assets	1	(1)	1	(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	378	252	360	275
Net realized/unrealized gains (losses) included in principal transactions	255	52	345	95
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	41	12	62	61
Transfers out of Level 3, assets	(5)	(19)	(31)	(91)
Purchases, assets	109	245	178	279
Issuance, assets	0	0	(33)	0
Sales, assets	(322)	(22)	(425)	(99)
Settlements, assets	(2)	0	(2)	0
Balance at end of period, asset	454	520	454	520
Unrealized gains (losses) still held, assets	55	248	34	251
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	127	237	153	120
Net realized/unrealized gains (losses) included in principal transactions	13	7	3	82
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	(2)	16	(1)	17
Transfers out of Level 3, assets	0	(5)	(11)	(20)
Purchases, assets	48	74	57	242
Issuance, assets	0	0	0	0
Sales, assets	(63)	(36)	(78)	(148)
Settlements, assets	0	0	0	0
Balance at end of period, asset	123	293	123	293
Unrealized gains (losses) still held, assets	(28)	30	(25)	26
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	1,429	1,597	1,484	1,590
Net realized/unrealized gains (losses) included in principal transactions	20	17	(6)	75
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	6	27	13	45
Transfers out of Level 3, assets	(15)	(32)	(47)	(47)
Purchases, assets	242	373	463	689
Issuance, assets	0	0	0	0
Sales, assets	(271)	(294)	(496)	(664)
Settlements, assets	0	0	0	0
Balance at end of period, asset	1,411	1,688	1,411	1,688
Unrealized gains (losses) still held, assets	10	(16)	57	39
Trading non-derivative assets | Other
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	1,042	716	818	615
Net realized/unrealized gains (losses) included in principal transactions	45	(52)	50	83
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	2	27	15	85
Transfers out of Level 3, assets	(135)	(32)	(167)	(42)
Purchases, assets	97	45	437	157
Issuance, assets	6	0	10	5
Sales, assets	(312)	(158)	(414)	(352)
Settlements, assets	(5)	(4)	(9)	(9)
Balance at end of period, asset	740	542	740	542
Unrealized gains (losses) still held, assets	6	(21)	(15)	(11)
Investments
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	2,384		1,737	2,437
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	54		122	(51)
Transfers into Level 3	18		115	38
Transfers out of Level 3, assets	(585)		(679)	(366)
Purchases, assets	256		1,034	231
Issuance, assets	0		0	0
Sales, assets	(430)		(611)	(245)
Settlements, assets	0		(21)	(52)
Balance at end of period, asset	1,697	1,992	1,697	1,992
Unrealized gains (losses) still held, assets	45		76	(69)
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	32	23	32	24
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)	10
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	31	34	31	34
Unrealized gains (losses) still held, assets	(1)	12	(3)	(12)
Investments | Residential mortgage
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 | Commercial and other
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	0	5	0	3
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	1	0	1
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	6	0	6
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	32	28	32	27
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)	12
Transfers into Level 3	0	1	0	1
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	31	40	31	40
Unrealized gains (losses) still held, assets	(1)	12	(3)	(12)
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 securities
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	910	682	708	737
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	42	3	94	(13)
Transfers into Level 3	11	0	14	0
Transfers out of Level 3, assets	0	(9)	0	(18)
Purchases, assets	236	111	421	140
Issuance, assets	0	0	0	0
Sales, assets	(173)	(25)	(211)	(84)
Settlements, assets	0	0	0	0
Balance at end of period, asset	1,026	762	1,026	762
Unrealized gains (losses) still held, assets	48	3	84	(22)
Investments | Foreign government
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	71	70	68	92
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	5	(3)	1	(4)
Transfers into Level 3	0	1	0	1
Transfers out of Level 3, assets	0	0	0	(2)
Purchases, assets	17	5	56	62
Issuance, assets	0	0	0	0
Sales, assets	(16)	(19)	(48)	(95)
Settlements, assets	0	0	0	0
Balance at end of period, asset	77	54	77	54
Unrealized gains (losses) still held, assets	1	(3)	1	(3)
Investments | Corporate
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	60	76	156	71
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	(1)
Transfers into Level 3	0	0	0	3
Transfers out of Level 3, assets	0	(2)	(94)	(2)
Purchases, assets	0	0	0	3
Issuance, assets	0	0	0	0
Sales, assets	(4)	(6)	(6)	(6)
Settlements, assets	0	0	0	0
Balance at end of period, asset	56	68	56	68
Unrealized gains (losses) still held, assets	0	0	0	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	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	0	0	(1)
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
Investments | Asset-backed securities
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	806	497	187	827
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	(25)	8	(15)
Transfers into Level 3	1	1	95	3
Transfers out of Level 3, assets	(585)	(2)	(585)	(344)
Purchases, assets	0	11	550	11
Issuance, assets	0	0	0	0
Sales, assets	(173)	(26)	(196)	(26)
Settlements, assets	0	0	0	0
Balance at end of period, asset	59	456	59	456
Unrealized gains (losses) still held, assets	9	(25)	9	(25)
Investments | Other
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 | Non-marketable equity securities
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	505		586	681
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	(2)		20	(30)
Transfers into Level 3	6		6	30
Transfers out of Level 3, assets	0		0	0
Purchases, assets	3		7	15
Issuance, assets	0		0	0
Sales, assets	(64)		(150)	(33)
Settlements, assets	0		(21)	(52)
Balance at end of period, asset	448	611	448	611
Unrealized gains (losses) still held, assets	(12)		(15)	(7)
Loans
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	373	554	277	550
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	63	(274)	108	(255)
Transfers into Level 3	3	0	128	0
Transfers out of Level 3, assets	0	60	(70)	59
Purchases, assets	5	47	11	51
Issuance, assets	0	0	0	0
Sales, assets	(25)	(6)	(35)	(22)
Settlements, assets	0	0	0	(2)
Balance at end of period, asset	419	381	419	381
Unrealized gains (losses) still held, assets	174	40	294	175
Mortgage servicing rights
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	551	587	584	558
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	(37)	11	(64)	57
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	16	15	28	32
Sales, assets	0	(1)	0	(18)
Settlements, assets	(22)	(16)	(40)	(33)
Balance at end of period, asset	508	596	508	596
Unrealized gains (losses) still held, assets	(34)	11	(60)	57
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	13	0	16
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	9	14	25	22
Transfers into Level 3	0	0	0	0
Transfers out of Level 3, assets	4	(11)	4	(11)
Purchases, assets	0	0	0	4
Issuance, assets	(3)	0	(5)	12
Sales, assets	(4)	(4)	(8)	(4)
Settlements, assets	(6)	(12)	(16)	(39)
Balance at end of period, asset	0	0	0	0
Unrealized gains (losses) still held, assets	$ 0	$ 14	$ 0	$ 33