Fair Value Measurements - Reconciliation (Details) - USD ($)
$ in Millions |
12 Months Ended |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |
|
|
|
| Balance, beginning |
$ (1,313)
|
$ (441)
|
$ (920)
|
| Total Realized/Unrealized Gains/(Losses) |
(984)
|
285
|
1,335
|
| Gains (Losses) in OCI |
0
|
0
|
(7)
|
| Purchases |
664
|
470
|
273
|
| Sales |
(979)
|
(1,155)
|
(863)
|
| Issuances |
0
|
0
|
0
|
| Settlements |
949
|
76
|
(261)
|
| Gross Transfers into Level 3 |
48
|
(186)
|
(40)
|
| Gross Transfers out of Level 3 |
(99)
|
(362)
|
42
|
| Balance, ending |
(1,714)
|
(1,313)
|
(441)
|
| Change in Unrealized Gains/(Losses) Related to Financial Instruments Still Held |
(409)
|
(376)
|
605
|
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
| Gross Derivative Assets |
351,600
|
631,100
|
|
| Gross Derivative Liabilities |
346,000
|
628,300
|
|
| Federal funds purchased and securities loaned or sold under agreements to repurchase |
|
|
|
| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
| Balance, beginning |
(359)
|
(335)
|
0
|
| Total Realized/Unrealized Gains/(Losses) |
(5)
|
(11)
|
(11)
|
| Gains (Losses) in OCI |
0
|
0
|
0
|
| Purchases |
0
|
0
|
0
|
| Sales |
0
|
0
|
0
|
| Issuances |
(12)
|
(22)
|
(131)
|
| Settlements |
171
|
27
|
217
|
| Gross Transfers into Level 3 |
(58)
|
(19)
|
(411)
|
| Gross Transfers out of Level 3 |
263
|
1
|
1
|
| Balance, ending |
0
|
(359)
|
(335)
|
| Change in Unrealized Gains/(Losses) Related to Financial Instruments Still Held |
0
|
4
|
0
|
| Corporate securities, trading loans and other |
|
|
|
| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
| Balance, beginning |
(27)
|
(21)
|
(36)
|
| Total Realized/Unrealized Gains/(Losses) |
14
|
5
|
19
|
| Gains (Losses) in OCI |
0
|
0
|
0
|
| Purchases |
8
|
0
|
30
|
| Sales |
(17)
|
(11)
|
(34)
|
| Issuances |
(2)
|
0
|
0
|
| Settlements |
0
|
0
|
0
|
| Gross Transfers into Level 3 |
0
|
0
|
0
|
| Gross Transfers out of Level 3 |
0
|
0
|
0
|
| Balance, ending |
(24)
|
(27)
|
(21)
|
| Change in Unrealized Gains/(Losses) Related to Financial Instruments Still Held |
2
|
4
|
(3)
|
| Short-term borrowings |
|
|
|
| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
| Balance, beginning |
0
|
(30)
|
0
|
| Total Realized/Unrealized Gains/(Losses) |
|
1
|
17
|
| Gains (Losses) in OCI |
|
0
|
0
|
| Purchases |
|
0
|
0
|
| Sales |
|
0
|
0
|
| Issuances |
|
0
|
(52)
|
| Settlements |
|
29
|
10
|
| Gross Transfers into Level 3 |
|
0
|
(24)
|
| Gross Transfers out of Level 3 |
|
0
|
19
|
| Balance, ending |
|
0
|
(30)
|
| Change in Unrealized Gains/(Losses) Related to Financial Instruments Still Held |
|
0
|
1
|
| Accrued expenses and other liabilities |
|
|
|
| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
| Balance, beginning |
(9)
|
(9)
|
(10)
|
| Total Realized/Unrealized Gains/(Losses) |
0
|
0
|
1
|
| Gains (Losses) in OCI |
0
|
0
|
0
|
| Purchases |
0
|
0
|
0
|
| Sales |
0
|
0
|
0
|
| Issuances |
0
|
0
|
0
|
| Settlements |
1
|
0
|
0
|
| Gross Transfers into Level 3 |
0
|
0
|
0
|
| Gross Transfers out of Level 3 |
0
|
0
|
0
|
| Balance, ending |
(8)
|
(9)
|
(9)
|
| Change in Unrealized Gains/(Losses) Related to Financial Instruments Still Held |
0
|
0
|
1
|
| Long-term debt |
|
|
|
| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
| Balance, beginning |
(1,514)
|
(1,513)
|
(2,362)
|
| Total Realized/Unrealized Gains/(Losses) |
(135)
|
(74)
|
287
|
| Gains (Losses) in OCI |
(31)
|
(20)
|
19
|
| Purchases |
84
|
140
|
616
|
| Sales |
0
|
0
|
0
|
| Issuances |
(288)
|
(521)
|
(188)
|
| Settlements |
514
|
948
|
273
|
| Gross Transfers into Level 3 |
(711)
|
(939)
|
(1,592)
|
| Gross Transfers out of Level 3 |
218
|
465
|
1,434
|
| Balance, ending |
(1,863)
|
(1,514)
|
(1,513)
|
| Change in Unrealized Gains/(Losses) Related to Financial Instruments Still Held |
(196)
|
(184)
|
255
|
| Level 3 | Recurring |
|
|
|
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |
|
|
|
| Balance, beginning |
(1,313)
|
|
|
| Balance, ending |
(1,714)
|
(1,313)
|
|
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
| Gross Derivative Assets |
4,067
|
3,931
|
5,100
|
| Gross Derivative Liabilities |
5,781
|
5,244
|
5,600
|
| Corporate securities, trading loans and other |
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
| Balance, beginning |
2,777
|
2,838
|
3,270
|
| Total Realized/Unrealized Gains/(Losses) |
229
|
78
|
(31)
|
| Gains (Losses) in OCI |
0
|
2
|
(11)
|
| Purchases |
547
|
1,508
|
1,540
|
| Sales |
(702)
|
(847)
|
(1,616)
|
| Issuances |
5
|
0
|
0
|
| Settlements |
(666)
|
(725)
|
(1,122)
|
| Gross Transfers into Level 3 |
728
|
728
|
1,570
|
| Gross Transfers out of Level 3 |
(1,054)
|
(805)
|
(762)
|
| Balance, ending |
1,864
|
2,777
|
2,838
|
| Change in Unrealized Gains/(Losses) Related to Financial Instruments Still Held |
2
|
(82)
|
(123)
|
| Equity securities |
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
| Balance, beginning |
281
|
407
|
352
|
| Total Realized/Unrealized Gains/(Losses) |
18
|
74
|
9
|
| Gains (Losses) in OCI |
0
|
0
|
0
|
| Purchases |
55
|
73
|
49
|
| Sales |
(70)
|
(169)
|
(11)
|
| Issuances |
0
|
0
|
0
|
| Settlements |
(10)
|
(82)
|
(11)
|
| Gross Transfers into Level 3 |
146
|
70
|
41
|
| Gross Transfers out of Level 3 |
(185)
|
(92)
|
(22)
|
| Balance, ending |
235
|
281
|
407
|
| Change in Unrealized Gains/(Losses) Related to Financial Instruments Still Held |
(1)
|
(59)
|
3
|
| Non-U.S. sovereign debt |
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
| Balance, beginning |
510
|
521
|
574
|
| Total Realized/Unrealized Gains/(Losses) |
74
|
122
|
114
|
| Gains (Losses) in OCI |
(8)
|
91
|
(179)
|
| Purchases |
53
|
12
|
185
|
| Sales |
(59)
|
(146)
|
(1)
|
| Issuances |
0
|
0
|
0
|
| Settlements |
(73)
|
(90)
|
(145)
|
| Gross Transfers into Level 3 |
72
|
0
|
0
|
| Gross Transfers out of Level 3 |
(13)
|
0
|
(27)
|
| Balance, ending |
556
|
510
|
521
|
| Change in Unrealized Gains/(Losses) Related to Financial Instruments Still Held |
70
|
120
|
74
|
| Mortgage trading loans, ABS and other MBS |
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
| Balance, beginning |
1,211
|
1,868
|
2,063
|
| Total Realized/Unrealized Gains/(Losses) |
165
|
188
|
154
|
| Gains (Losses) in OCI |
(2)
|
(2)
|
1
|
| Purchases |
1,210
|
988
|
1,250
|
| Sales |
(990)
|
(1,491)
|
(1,117)
|
| Issuances |
0
|
0
|
0
|
| Settlements |
(233)
|
(344)
|
(493)
|
| Gross Transfers into Level 3 |
218
|
158
|
50
|
| Gross Transfers out of Level 3 |
(81)
|
(154)
|
(40)
|
| Balance, ending |
1,498
|
1,211
|
1,868
|
| Change in Unrealized Gains/(Losses) Related to Financial Instruments Still Held |
72
|
64
|
(93)
|
| Trading Securities |
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
| Balance, beginning |
4,779
|
5,634
|
6,259
|
| Total Realized/Unrealized Gains/(Losses) |
486
|
462
|
246
|
| Gains (Losses) in OCI |
(10)
|
91
|
(189)
|
| Purchases |
1,865
|
2,581
|
3,024
|
| Sales |
(1,821)
|
(2,653)
|
(2,745)
|
| Issuances |
5
|
0
|
0
|
| Settlements |
(982)
|
(1,241)
|
(1,771)
|
| Gross Transfers into Level 3 |
1,164
|
956
|
1,661
|
| Gross Transfers out of Level 3 |
(1,333)
|
(1,051)
|
(851)
|
| Balance, ending |
4,153
|
4,779
|
5,634
|
| Change in Unrealized Gains/(Losses) Related to Financial Instruments Still Held |
143
|
43
|
(139)
|
| Non-agency residential MBS |
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
| Balance, beginning |
0
|
106
|
279
|
| Total Realized/Unrealized Gains/(Losses) |
|
0
|
(12)
|
| Gains (Losses) in OCI |
|
0
|
0
|
| Purchases |
|
0
|
134
|
| Sales |
|
(106)
|
0
|
| Issuances |
|
0
|
0
|
| Settlements |
|
0
|
(425)
|
| Gross Transfers into Level 3 |
|
0
|
167
|
| Gross Transfers out of Level 3 |
|
0
|
(37)
|
| Balance, ending |
|
0
|
106
|
| Change in Unrealized Gains/(Losses) Related to Financial Instruments Still Held |
|
0
|
0
|
| Non-U.S. securities |
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
| Balance, beginning |
229
|
0
|
10
|
| Total Realized/Unrealized Gains/(Losses) |
2
|
0
|
0
|
| Gains (Losses) in OCI |
16
|
(6)
|
0
|
| Purchases |
49
|
584
|
0
|
| Sales |
0
|
(92)
|
0
|
| Issuances |
0
|
0
|
0
|
| Settlements |
(271)
|
(263)
|
(10)
|
| Gross Transfers into Level 3 |
0
|
6
|
0
|
| Gross Transfers out of Level 3 |
0
|
0
|
0
|
| Balance, ending |
25
|
229
|
0
|
| Change in Unrealized Gains/(Losses) Related to Financial Instruments Still Held |
0
|
0
|
0
|
| Other taxable securities |
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
| Balance, beginning |
594
|
757
|
1,667
|
| Total Realized/Unrealized Gains/(Losses) |
4
|
4
|
0
|
| Gains (Losses) in OCI |
8
|
(2)
|
0
|
| Purchases |
5
|
0
|
189
|
| Sales |
0
|
0
|
0
|
| Issuances |
0
|
0
|
0
|
| Settlements |
(42)
|
(83)
|
(160)
|
| Gross Transfers into Level 3 |
34
|
0
|
0
|
| Gross Transfers out of Level 3 |
(94)
|
(82)
|
(939)
|
| Balance, ending |
509
|
594
|
757
|
| Change in Unrealized Gains/(Losses) Related to Financial Instruments Still Held |
0
|
0
|
0
|
| Tax-exempt securities |
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
| Balance, beginning |
542
|
569
|
599
|
| Total Realized/Unrealized Gains/(Losses) |
1
|
0
|
0
|
| Gains (Losses) in OCI |
3
|
(1)
|
0
|
| Purchases |
14
|
1
|
0
|
| Sales |
(70)
|
0
|
0
|
| Issuances |
0
|
0
|
0
|
| Settlements |
(11)
|
(2)
|
(30)
|
| Gross Transfers into Level 3 |
35
|
10
|
0
|
| Gross Transfers out of Level 3 |
(45)
|
(35)
|
0
|
| Balance, ending |
469
|
542
|
569
|
| Change in Unrealized Gains/(Losses) Related to Financial Instruments Still Held |
0
|
0
|
0
|
| Available-for-sale Securities |
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
| Balance, beginning |
1,365
|
1,432
|
2,555
|
| Total Realized/Unrealized Gains/(Losses) |
7
|
4
|
(12)
|
| Gains (Losses) in OCI |
27
|
(9)
|
0
|
| Purchases |
68
|
585
|
323
|
| Sales |
(70)
|
(198)
|
0
|
| Issuances |
0
|
0
|
0
|
| Settlements |
(324)
|
(348)
|
(625)
|
| Gross Transfers into Level 3 |
69
|
16
|
167
|
| Gross Transfers out of Level 3 |
(139)
|
(117)
|
(976)
|
| Balance, ending |
1,003
|
1,365
|
1,432
|
| Change in Unrealized Gains/(Losses) Related to Financial Instruments Still Held |
0
|
0
|
0
|
| Other debt securities carried at fair value – Non-agency residential MBS |
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
| Balance, beginning |
25
|
30
|
0
|
| Total Realized/Unrealized Gains/(Losses) |
(1)
|
(5)
|
(3)
|
| Gains (Losses) in OCI |
0
|
0
|
0
|
| Purchases |
0
|
0
|
33
|
| Sales |
(21)
|
0
|
0
|
| Issuances |
0
|
0
|
0
|
| Settlements |
(3)
|
0
|
0
|
| Gross Transfers into Level 3 |
0
|
0
|
0
|
| Gross Transfers out of Level 3 |
0
|
0
|
0
|
| Balance, ending |
0
|
25
|
30
|
| Change in Unrealized Gains/(Losses) Related to Financial Instruments Still Held |
0
|
0
|
0
|
| Loans and leases |
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
| Balance, beginning |
720
|
1,620
|
1,983
|
| Total Realized/Unrealized Gains/(Losses) |
15
|
(44)
|
(23)
|
| Gains (Losses) in OCI |
0
|
0
|
0
|
| Purchases |
3
|
69
|
0
|
| Sales |
(34)
|
(553)
|
(4)
|
| Issuances |
0
|
50
|
57
|
| Settlements |
(126)
|
(194)
|
(237)
|
| Gross Transfers into Level 3 |
0
|
6
|
144
|
| Gross Transfers out of Level 3 |
(7)
|
(234)
|
(300)
|
| Balance, ending |
571
|
720
|
1,620
|
| Change in Unrealized Gains/(Losses) Related to Financial Instruments Still Held |
11
|
17
|
13
|
| Mortgage servicing rights |
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
| Balance, beginning |
2,747
|
3,087
|
3,530
|
| Total Realized/Unrealized Gains/(Losses) |
70
|
149
|
187
|
| Gains (Losses) in OCI |
0
|
0
|
0
|
| Purchases |
0
|
0
|
0
|
| Sales |
(25)
|
(80)
|
(393)
|
| Issuances |
258
|
411
|
637
|
| Settlements |
(748)
|
(820)
|
(874)
|
| Gross Transfers into Level 3 |
0
|
0
|
0
|
| Gross Transfers out of Level 3 |
0
|
0
|
0
|
| Balance, ending |
2,302
|
2,747
|
3,087
|
| Change in Unrealized Gains/(Losses) Related to Financial Instruments Still Held |
(248)
|
(107)
|
(85)
|
| Loans Held-for-Sale |
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
| Balance, beginning |
656
|
787
|
173
|
| Total Realized/Unrealized Gains/(Losses) |
100
|
79
|
(51)
|
| Gains (Losses) in OCI |
(3)
|
50
|
(8)
|
| Purchases |
3
|
22
|
771
|
| Sales |
(189)
|
(256)
|
(203)
|
| Issuances |
0
|
0
|
61
|
| Settlements |
(346)
|
(93)
|
(61)
|
| Gross Transfers into Level 3 |
501
|
173
|
203
|
| Gross Transfers out of Level 3 |
(32)
|
(106)
|
(98)
|
| Balance, ending |
690
|
656
|
787
|
| Change in Unrealized Gains/(Losses) Related to Financial Instruments Still Held |
14
|
70
|
(39)
|
| Other assets |
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
|
|
| Balance, beginning |
239
|
374
|
911
|
| Total Realized/Unrealized Gains/(Losses) |
74
|
(13)
|
(55)
|
| Gains (Losses) in OCI |
(57)
|
0
|
0
|
| Purchases |
2
|
38
|
11
|
| Sales |
(189)
|
(111)
|
(130)
|
| Issuances |
0
|
0
|
0
|
| Settlements |
(10)
|
(52)
|
(51)
|
| Gross Transfers into Level 3 |
64
|
3
|
10
|
| Gross Transfers out of Level 3 |
0
|
0
|
(322)
|
| Balance, ending |
123
|
239
|
374
|
| Change in Unrealized Gains/(Losses) Related to Financial Instruments Still Held |
$ 22
|
$ (36)
|
$ (61)
|