FAIR VALUE MEASUREMENT - Level 3 Roll Forward (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation
Threshold tenor of repo curves to classify certain reverse repos to Level 3			5 years
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	$ (2,688)	$ (1,457)	$ (2,661)	$ (991)
Net realized/unrealized gains (losses) included in earnings	564	(518)	(478)	(742)
Transfers into Level 3	47	(374)	101	(851)
Transfers out of Level 3	43	(39)	57	144
Purchases	269	179	611	587
Sales	(276)	(108)	(431)	(347)
Settlements	(142)	(107)	618	(224)
Balance at end of period, asset (liability), net	(2,183)	(2,424)	(2,183)	(2,424)
Unrealized gains (losses) still held	209	(590)	117	(551)
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	(423)	17	(211)	839
Net realized/unrealized gains (losses) included in earnings	(205)	76	(633)	(508)
Transfers into Level 3	(1)	(194)	(137)	(42)
Transfers out of Level 3	2	7	(37)	(117)
Purchases	(5)	52	13	94
Sales	0	(52)	166	(150)
Settlements	(8)	32	199	(178)
Balance at end of period, asset (liability), net	(640)	(62)	(640)	(62)
Unrealized gains (losses) still held	(61)	94	117	(11)
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	391	847	778	695
Net realized/unrealized gains (losses) included in earnings	206	8	(218)	105
Transfers into Level 3	(4)	7	(5)	28
Transfers out of Level 3	106	(73)	25	(43)
Purchases	102	3	276	4
Sales	(92)	(1)	(270)	(2)
Settlements	(42)	(14)	81	(10)
Balance at end of period, asset (liability), net	667	777	667	777
Unrealized gains (losses) still held	83	43	95	67
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	(355)	(893)	(863)	(858)
Net realized/unrealized gains (losses) included in earnings	272	8	594	250
Transfers into Level 3	(31)	(171)	(54)	(762)
Transfers out of Level 3	(108)	143	8	473
Purchases	172	124	322	386
Sales	(184)	(55)	(324)	(192)
Settlements	(218)	(215)	(135)	(356)
Balance at end of period, asset (liability), net	(452)	(1,059)	(452)	(1,059)
Unrealized gains (losses) still held	187	(235)	47	(402)
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	(1,727)	(1,229)	(1,622)	(1,393)
Net realized/unrealized gains (losses) included in earnings	(166)	(388)	(556)	(140)
Transfers into Level 3	31	0	214	25
Transfers out of Level 3	(21)	(27)	(11)	(35)
Purchases	0	0	0	0
Sales	0	0	0	0
Settlements	36	97	128	(4)
Balance at end of period, asset (liability), net	(1,847)	(1,547)	(1,847)	(1,547)
Unrealized gains (losses) still held	(196)	(228)	(361)	(9)
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	(574)	(199)	(743)	(274)
Net realized/unrealized gains (losses) included in earnings	457	(222)	335	(449)
Transfers into Level 3	52	(16)	83	(100)
Transfers out of Level 3	64	(89)	72	(134)
Purchases	0	0	0	103
Sales	0	0	(3)	(3)
Settlements	90	(7)	345	324
Balance at end of period, asset (liability), net	89	(533)	89	(533)
Unrealized gains (losses) still held	196	(264)	219	(196)
Interest-bearing deposits
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, liability	347	909	486	890
Net realized/unrealized gains (losses) included in earnings, liabilities	0	0	0	0
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities	(108)	184	(7)	94
Transfers into Level 3, liabilities	0	0	0	0
Transfers out of Level 3, liabilities	0	(12)	0	(12)
Purchases, liability	0	0	0	0
Issuance, liability	12	117	12	117
Sales, liability	0	0	0	0
Settlements, liability	(9)	(25)	(47)	(96)
Balance at end of period, liability	458	805	458	805
Unrealized gains (losses) still held, liabilities	(204)	20	(250)	(31)
Federal funds purchased and securities loaned or sold under agreements to repurchase
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, liability	965	1,032	1,043	902
Net realized/unrealized gains (losses) included in earnings, liabilities	(1)	13	(24)	4
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	54
Transfers out of Level 3, liabilities	0	0	0	0
Purchases, liability	0	0	0	78
Issuance, liability	0	0	0	0
Sales, liability	292	117	285	106
Settlements, liability	1	(102)	(93)	(102)
Balance at end of period, liability	1,259	1,034	1,259	1,034
Unrealized gains (losses) still held, liabilities	(1)	5	0	(18)
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	257	472	424	590
Net realized/unrealized gains (losses) included in earnings, liabilities	63	(1)	41	14
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities	0	0	0	0
Transfers into Level 3, liabilities	66	19	263	68
Transfers out of Level 3, liabilities	(9)	(40)	(196)	(91)
Purchases, liability	0	0	0	0
Issuance, liability	0	0	0	0
Sales, liability	103	149	260	443
Settlements, liability	(120)	(233)	(476)	(628)
Balance at end of period, liability	234	368	234	368
Unrealized gains (losses) still held, liabilities	(9)	(11)	(22)	(19)
Short-term borrowings
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, liability	133	129	344	29
Net realized/unrealized gains (losses) included in earnings, liabilities	(9)	0	1	(31)
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities	0	0	0	0
Transfers into Level 3, liabilities	4	1	21	81
Transfers out of Level 3, liabilities	(3)	0	(18)	0
Purchases, liability	0	0	0	8
Issuance, liability	10	23	59	24
Sales, liability	0	0	0	0
Settlements, liability	(51)	(52)	(303)	(72)
Balance at end of period, liability	102	101	102	101
Unrealized gains (losses) still held, liabilities	(12)	(8)	(15)	(15)
Long-term debt
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, liability	7,665	7,847	7,290	7,621
Net realized/unrealized gains (losses) included in earnings, liabilities	194	520	562	139
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities	0	0	0	49
Transfers into Level 3, liabilities	995	476	2,081	2,089
Transfers out of Level 3, liabilities	(736)	(760)	(2,774)	(2,998)
Purchases, liability	0	0	0	0
Issuance, liability	679	1,419	3,080	3,365
Sales, liability	0	0	0	0
Settlements, liability	(214)	(904)	(920)	(2,331)
Balance at end of period, liability	8,195	7,558	8,195	7,558
Unrealized gains (losses) still held, liabilities	(180)	215	(230)	(205)
Other financial liabilities
Fair value, liabilities measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, liability	4	6	7	10
Net realized/unrealized gains (losses) included in earnings, liabilities	0	0	0	0
Net realized/unrealized gains (losses) included in locations other than principal transactions, liabilities	(1)	(2)	(8)	(3)
Transfers into Level 3, liabilities	2	0	2	4
Transfers out of Level 3, liabilities	0	0	(4)	0
Purchases, liability	(1)	0	(3)	(1)
Issuance, liability	1	0	3	1
Sales, liability	2	0	2	(3)
Settlements, liability	(4)	(1)	(10)	(7)
Balance at end of period, liability	5	7	5	7
Unrealized gains (losses) still held, liabilities	1	(1)	0	(1)
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	1,070	3,363	3,398	3,566
Net realized/unrealized gains (losses) included in principal transactions	66	116	(69)	37
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	279	0	279	67
Transfers out of Level 3, assets	0	0	(2,856)	(8)
Purchases, assets	0	0	784	75
Issuance, assets	0	0	0	0
Sales, assets	0	0	0	0
Settlements, assets	0	0	(121)	(258)
Balance at end of period, asset	1,415	3,479	1,415	3,479
Unrealized gains (losses) still held, assets	1	130	1	153
Trading non-derivative assets
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	14,299	14,940	15,357	15,260
Net realized/unrealized gains (losses) included in principal transactions	126	590	812	1,401
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	697	1,532	2,670	3,772
Transfers out of Level 3, assets	(1,567)	(1,147)	(5,200)	(4,102)
Purchases, assets	2,366	4,318	10,004	13,906
Issuance, assets	9	6	41	13
Sales, assets	(3,316)	(4,245)	(10,999)	(14,158)
Settlements, assets	(10)	(259)	(81)	(357)
Balance at end of period, asset	12,604	15,735	12,604	15,735
Unrealized gains (losses) still held, assets	51	(6)	124	410
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	611	697	1,085	1,094
Net realized/unrealized gains (losses) included in principal transactions	1	22	30	120
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	208	217	690	594
Transfers out of Level 3, assets	(212)	(145)	(1,062)	(743)
Purchases, assets	166	97	505	358
Issuance, assets	0	6	0	13
Sales, assets	(131)	(89)	(619)	(606)
Settlements, assets	9	(16)	23	(41)
Balance at end of period, asset	652	789	652	789
Unrealized gains (losses) still held, assets	2	18	1	27
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	2,206	2,610	2,680	2,854
Net realized/unrealized gains (losses) included in principal transactions	37	63	243	380
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	57	86	235	239
Transfers out of Level 3, assets	(119)	(77)	(401)	(359)
Purchases, assets	294	197	1,423	1,877
Issuance, assets	0	0	0	0
Sales, assets	(450)	(389)	(2,155)	(2,501)
Settlements, assets	0	0	0	0
Balance at end of period, asset	2,025	2,490	2,025	2,490
Unrealized gains (losses) still held, assets	1	(4)	(97)	108
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	368	409	440	256
Net realized/unrealized gains (losses) included in principal transactions	3	7	16	18
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	20	84	176	160
Transfers out of Level 3, assets	(60)	(58)	(138)	(120)
Purchases, assets	30	288	442	524
Issuance, assets	0	0	0	0
Sales, assets	(139)	(176)	(714)	(284)
Settlements, assets	0	0	0	0
Balance at end of period, asset	222	554	222	554
Unrealized gains (losses) still held, assets	1	(4)	(9)	1
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	3,185	3,716	4,205	4,204
Net realized/unrealized gains (losses) included in principal transactions	41	92	289	518
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	285	387	1,101	993
Transfers out of Level 3, assets	(391)	(280)	(1,601)	(1,222)
Purchases, assets	490	582	2,370	2,759
Issuance, assets	0	6	0	13
Sales, assets	(720)	(654)	(3,488)	(3,391)
Settlements, assets	9	(16)	23	(41)
Balance at end of period, asset	2,899	3,833	2,899	3,833
Unrealized gains (losses) still held, assets	4	10	(105)	136
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	3
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	1	0	1	0
Transfers out of Level 3, assets	0	0	0	0
Purchases, assets	2	7	2	7
Issuance, assets	0	0	0	0
Sales, assets	0	0	0	(3)
Settlements, assets	0	0	0	0
Balance at end of period, asset	3	7	3	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	249	242	241	222
Net realized/unrealized gains (losses) included in principal transactions	9	7	(1)	11
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	8	4	35	149
Transfers out of Level 3, assets	(22)	(1)	(29)	(105)
Purchases, assets	39	15	48	33
Issuance, assets	0	0	0	0
Sales, assets	(6)	(16)	(17)	(59)
Settlements, assets	0	0	0	0
Balance at end of period, asset	277	251	277	251
Unrealized gains (losses) still held, assets	0	6	2	(17)
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	82	465	206	416
Net realized/unrealized gains (losses) included in principal transactions	(1)	(40)	(4)	(56)
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	25	31	52	117
Transfers out of Level 3, assets	0	(64)	(100)	(166)
Purchases, assets	19	212	124	571
Issuance, assets	0	0	0	0
Sales, assets	(40)	(241)	(139)	(519)
Settlements, assets	0	22	(54)	22
Balance at end of period, asset	85	385	85	385
Unrealized gains (losses) still held, assets	(1)	(13)	2	18
Trading non-derivative assets | Corporate
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	708	1,262	820	1,835
Net realized/unrealized gains (losses) included in principal transactions	(19)	83	185	1
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	53	141	107	394
Transfers out of Level 3, assets	(177)	(104)	(262)	(444)
Purchases, assets	94	471	605	1,742
Issuance, assets	0	0	0	0
Sales, assets	(268)	(685)	(1,053)	(2,353)
Settlements, assets	0	46	(11)	39
Balance at end of period, asset	391	1,214	391	1,214
Unrealized gains (losses) still held, assets	(6)	(42)	24	19
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	2,741	1,863	2,219	1,057
Net realized/unrealized gains (losses) included in principal transactions	75	(2)	29	(215)
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	148	123	310	159
Transfers out of Level 3, assets	(52)	(35)	(240)	(95)
Purchases, assets	438	119	1,180	1,305
Issuance, assets	0	0	0	0
Sales, assets	(66)	(113)	(214)	(256)
Settlements, assets	0	0	0	0
Balance at end of period, asset	3,284	1,955	3,284	1,955
Unrealized gains (losses) still held, assets	16	34	93	22
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	4,236	3,376	3,294	4,342
Net realized/unrealized gains (losses) included in principal transactions	66	394	299	1,002
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	53	37	623	120
Transfers out of Level 3, assets	(109)	(56)	(224)	(284)
Purchases, assets	827	1,219	3,586	2,921
Issuance, assets	0	0	0	0
Sales, assets	(1,696)	(1,619)	(4,201)	(4,750)
Settlements, assets	0	0	0	0
Balance at end of period, asset	3,377	3,351	3,377	3,351
Unrealized gains (losses) still held, assets	11	33	74	246
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	3,098	4,016	4,372	3,184
Net realized/unrealized gains (losses) included in principal transactions	(45)	56	15	137
Net realized/unrealized gains (losses) included in locations other than principal transactions, assets	0	0	0	0
Transfers into Level 3	124	809	441	1,840
Transfers out of Level 3, assets	(816)	(607)	(2,744)	(1,786)
Purchases, assets	457	1,693	2,089	4,568
Issuance, assets	9	0	41	0
Sales, assets	(520)	(917)	(1,887)	(2,827)
Settlements, assets	(19)	(311)	(39)	(377)
Balance at end of period, asset	2,288	4,739	2,288	4,739
Unrealized gains (losses) still held, assets	27	(34)	34	(14)
Investments
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	5,679	8,531	6,273	7,902
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)	34	(31)	335
Transfers into Level 3	394	96	735	1,161
Transfers out of Level 3, assets	(492)	(364)	(989)	(981)
Purchases, assets	484	985	1,484	2,589
Issuance, assets	0	0	0	0
Sales, assets	(521)	(916)	(1,381)	(2,023)
Settlements, assets	(113)	(1,484)	(661)	(2,101)
Balance at end of period, asset	5,430	6,882	5,430	6,882
Unrealized gains (losses) still held, assets	(20)	(25)	1	180
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	96	163	38	187
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	(4)	2	(4)	47
Transfers into Level 3	29	18	133	53
Transfers out of Level 3, assets	(68)	(83)	(113)	(137)
Purchases, assets	62	0	62	17
Issuance, assets	0	0	0	0
Sales, assets	(1)	(7)	(2)	(73)
Settlements, assets	0	(1)	0	(2)
Balance at end of period, asset	114	92	114	92
Unrealized gains (losses) still held, assets	(4)	0	(4)	(3)
Investments | Mortgage-backed securities - Residential
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	10	17	8	102
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	(1)	33
Transfers into Level 3	0	1	0	31
Transfers out of Level 3, assets	0	0	0	(1)
Purchases, assets	0	0	11	17
Issuance, assets	0	0	0	0
Sales, assets	(10)	(5)	(18)	(169)
Settlements, assets	0	0	0	0
Balance at end of period, asset	0	13	0	13
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	0	7	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	2	0	4	4
Transfers out of Level 3, assets	0	(4)	(3)	(4)
Purchases, assets	0	7	0	10
Issuance, assets	0	0	0	0
Sales, assets	0	0	0	0
Settlements, assets	0	0	0	0
Balance at end of period, asset	2	10	2	10
Unrealized gains (losses) still held, assets	0	2	0	2
Investments | Mortgage-backed securities
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	106	187	47	289
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	(4)	2	(5)	80
Transfers into Level 3	31	19	137	88
Transfers out of Level 3, assets	(68)	(87)	(116)	(142)
Purchases, assets	62	7	73	44
Issuance, assets	0	0	0	0
Sales, assets	(11)	(12)	(20)	(242)
Settlements, assets	0	(1)	0	(2)
Balance at end of period, asset	116	115	116	115
Unrealized gains (losses) still held, assets	(4)	2	(4)	(1)
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	5	7	6	8
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	6	0	6	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	10	6	10	6
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	2,153	2,102	2,180	1,643
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	11	37	4	102
Transfers into Level 3	305	67	464	784
Transfers out of Level 3, assets	(268)	(69)	(506)	(534)
Purchases, assets	253	540	652	1,038
Issuance, assets	0	0	0	0
Sales, assets	(189)	(393)	(529)	(749)
Settlements, assets	(100)	0	(100)	0
Balance at end of period, asset	2,165	2,284	2,165	2,284
Unrealized gains (losses) still held, assets	(4)	6	(35)	72
Investments | Foreign government
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	493	615	678	344
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	(7)	(8)	41	(13)
Transfers into Level 3	3	0	(5)	182
Transfers out of Level 3, assets	(156)	(63)	(261)	(105)
Purchases, assets	74	294	558	623
Issuance, assets	0	0	0	0
Sales, assets	(164)	(198)	(498)	(305)
Settlements, assets	0	(20)	(270)	(106)
Balance at end of period, asset	243	620	243	620
Unrealized gains (losses) still held, assets	0	(9)	0	(2)
Investments | Corporate
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	698	512	672	285
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	(38)	(18)	8	(5)
Transfers into Level 3	4	4	6	22
Transfers out of Level 3, assets	0	(136)	(44)	(137)
Purchases, assets	53	23	122	289
Issuance, assets	0	0	0	0
Sales, assets	(75)	(147)	(88)	(196)
Settlements, assets	(1)	124	(35)	104
Balance at end of period, asset	641	362	641	362
Unrealized gains (losses) still held, assets	(35)	(4)	(38)	(8)
Investments | Equity securities
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	483	826	681	815
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	31	18	(55)	30
Transfers into Level 3	5	6	12	18
Transfers out of Level 3, assets	0	(7)	(10)	(19)
Purchases, assets	7	2	7	8
Issuance, assets	0	0	0	0
Sales, assets	(81)	(84)	(190)	(91)
Settlements, assets	0	0	0	0
Balance at end of period, asset	445	761	445	761
Unrealized gains (losses) still held, assets	10	(23)	10	(1)
Investments | Asset-backed securities
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	503	1,739	549	1,960
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	(8)	4	(28)	15
Transfers into Level 3	45	0	45	0
Transfers out of Level 3, assets	0	(2)	(58)	(44)
Purchases, assets	18	0	51	55
Issuance, assets	0	0	0	0
Sales, assets	0	0	(1)	(97)
Settlements, assets	0	(1,157)	0	(1,305)
Balance at end of period, asset	558	584	558	584
Unrealized gains (losses) still held, assets	(5)	(39)	(6)	0
Investments | Other debt securities
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	0	48	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	(1)
Transfers into Level 3	0	0	0	0
Transfers out of Level 3, assets	0	0	0	0
Purchases, assets	10	66	10	116
Issuance, assets	0	0	0	0
Sales, assets	0	(49)	0	(50)
Settlements, assets	0	0	0	(50)
Balance at end of period, asset	10	65	10	65
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	1,238	2,495	1,460	2,508
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	14	(1)	4	127
Transfers into Level 3	1	0	76	67
Transfers out of Level 3, assets	0	0	6	0
Purchases, assets	1	53	5	416
Issuance, assets	0	0	0	0
Sales, assets	0	(32)	(53)	(291)
Settlements, assets	(12)	(430)	(256)	(742)
Balance at end of period, asset	1,242	2,085	1,242	2,085
Unrealized gains (losses) still held, assets	18	42	74	120
Loans
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	3,840	3,310	3,108	4,143
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	(125)	(31)	(199)	(183)
Transfers into Level 3	0	8	689	92
Transfers out of Level 3, assets	(720)	0	(805)	6
Purchases, assets	162	287	736	553
Issuance, assets	69	19	432	84
Sales, assets	(121)	(513)	(496)	(630)
Settlements, assets	(450)	(132)	(810)	(1,117)
Balance at end of period, asset	2,655	2,948	2,655	2,948
Unrealized gains (losses) still held, assets	(7)	2	16	17
Mortgage servicing rights
Fair value, assets measured on recurring basis, level 3 fair-value category reconciliation
Balance at beginning of period, asset	1,924	2,282	1,845	2,718
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	(131)	(18)	62	(233)
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	55	53	165	165
Sales, assets	4	(125)	(37)	(260)
Settlements, assets	(86)	(99)	(269)	(297)
Balance at end of period, asset	1,766	2,093	1,766	2,093
Unrealized gains (losses) still held, assets	(129)	(18)	(390)	(216)
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	139	201	78	181
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	78	14	94	39
Transfers into Level 3	7	(83)	87	(83)
Transfers out of Level 3, assets	(11)	0	(18)	0
Purchases, assets	1	0	4	1
Issuance, assets	67	35	165	122
Sales, assets	(7)	(1)	(21)	(10)
Settlements, assets	(82)	(58)	(197)	(142)
Balance at end of period, asset	192	108	192	108
Unrealized gains (losses) still held, assets	$ (12)	$ (2)	$ 453	$ (20)