Fair Value Disclosures (Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - Recurring - Level 3 - USD ($)
$ in Millions |
3 Months Ended |
12 Months Ended |
Mar. 31, 2016 |
Mar. 31, 2015 |
Dec. 31, 2015 |
Dec. 31, 2014 |
| Securities Received as Collateral |
|
|
|
|
| Assets |
|
|
|
|
| Beginning balance |
$ 1
|
$ 0
|
$ 0
|
|
| Realized and Unrealized Gains (Losses) |
0
|
0
|
|
|
| Purchases |
0
|
33
|
|
|
| Sales |
(1)
|
0
|
|
|
| Issuances |
0
|
0
|
|
|
| Settlements |
0
|
0
|
|
|
| Net Transfers |
0
|
0
|
|
|
| Ending balance |
0
|
33
|
1
|
$ 0
|
| Unrealized Gains (Losses) for Level 3 Assets Outstanding |
0
|
0
|
|
|
| Intangible Assets |
|
|
|
|
| Assets |
|
|
|
|
| Beginning balance |
5
|
6
|
6
|
|
| Realized and Unrealized Gains (Losses) |
0
|
0
|
|
|
| Purchases |
0
|
0
|
|
|
| Sales |
(1)
|
0
|
|
|
| Issuances |
0
|
0
|
|
|
| Settlements |
0
|
(1)
|
|
|
| Net Transfers |
0
|
0
|
|
|
| Ending balance |
4
|
5
|
5
|
6
|
| Unrealized Gains (Losses) for Level 3 Assets Outstanding |
(1)
|
0
|
|
|
| Deposits |
|
|
|
|
| Liabilities |
|
|
|
|
| Beginning balance |
19
|
|
|
|
| Realized and Unrealized Gains (Losses) |
2
|
|
|
|
| Purchases |
0
|
|
|
|
| Sales |
0
|
|
|
|
| Issuances |
2
|
|
|
|
| Settlements |
0
|
|
|
|
| Net Transfers |
0
|
|
|
|
| Ending balance |
23
|
|
19
|
|
| Unrealized Gains (Losses) for Level 3 Liabilities Outstanding |
(2)
|
|
|
|
| Short-term borrowings |
|
|
|
|
| Liabilities |
|
|
|
|
| Beginning balance |
1
|
|
|
|
| Realized and Unrealized Gains (Losses) |
0
|
|
|
|
| Purchases |
0
|
|
|
|
| Sales |
0
|
|
|
|
| Issuances |
0
|
|
|
|
| Settlements |
(1)
|
|
|
|
| Net Transfers |
0
|
|
|
|
| Ending balance |
0
|
|
1
|
|
| Unrealized Gains (Losses) for Level 3 Liabilities Outstanding |
0
|
|
|
|
| Obligation to Return Securities Received as Collateral |
|
|
|
|
| Liabilities |
|
|
|
|
| Beginning balance |
1
|
0
|
0
|
|
| Realized and Unrealized Gains (Losses) |
0
|
0
|
|
|
| Purchases |
0
|
0
|
|
|
| Sales |
0
|
33
|
|
|
| Issuances |
0
|
0
|
|
|
| Settlements |
0
|
0
|
|
|
| Net Transfers |
0
|
0
|
|
|
| Ending balance |
1
|
33
|
1
|
0
|
| Unrealized Gains (Losses) for Level 3 Liabilities Outstanding |
0
|
0
|
|
|
| Securities Sold under agreements to repurchase |
|
|
|
|
| Liabilities |
|
|
|
|
| Beginning balance |
151
|
153
|
153
|
|
| Realized and Unrealized Gains (Losses) |
0
|
1
|
|
|
| Purchases |
0
|
0
|
|
|
| Sales |
0
|
0
|
|
|
| Issuances |
0
|
0
|
|
|
| Settlements |
0
|
0
|
|
|
| Net Transfers |
0
|
0
|
|
|
| Ending balance |
151
|
154
|
151
|
153
|
| Unrealized Gains (Losses) for Level 3 Liabilities Outstanding |
0
|
(1)
|
|
|
| Other Secured Financings |
|
|
|
|
| Liabilities |
|
|
|
|
| Beginning balance |
461
|
149
|
149
|
|
| Realized and Unrealized Gains (Losses) |
18
|
8
|
|
|
| Purchases |
0
|
0
|
|
|
| Sales |
0
|
0
|
|
|
| Issuances |
47
|
0
|
|
|
| Settlements |
(22)
|
(24)
|
|
|
| Net Transfers |
(50)
|
0
|
|
|
| Ending balance |
454
|
133
|
461
|
149
|
| Unrealized Gains (Losses) for Level 3 Liabilities Outstanding |
(18)
|
1
|
|
|
| Long-term borrowings |
|
|
|
|
| Liabilities |
|
|
|
|
| Beginning balance |
1,987
|
1,934
|
1,934
|
|
| Realized and Unrealized Gains (Losses) |
46
|
(17)
|
|
|
| Purchases |
0
|
0
|
|
|
| Sales |
0
|
0
|
|
|
| Issuances |
72
|
115
|
|
|
| Settlements |
(79)
|
(142)
|
|
|
| Net Transfers |
(228)
|
(152)
|
|
|
| Ending balance |
1,798
|
1,738
|
1,987
|
1,934
|
| Unrealized Gains (Losses) for Level 3 Liabilities Outstanding |
(45)
|
10
|
|
|
| Trading Assets | U.S. Agency Securities |
|
|
|
|
| Assets |
|
|
|
|
| Beginning balance |
0
|
|
|
|
| Realized and Unrealized Gains (Losses) |
5
|
|
|
|
| Purchases |
0
|
|
|
|
| Sales |
0
|
|
|
|
| Issuances |
0
|
|
|
|
| Settlements |
0
|
|
|
|
| Net Transfers |
3
|
|
|
|
| Ending balance |
8
|
|
0
|
|
| Unrealized Gains (Losses) for Level 3 Assets Outstanding |
5
|
|
|
|
| Trading Assets | Other Sovereign Government Obligations |
|
|
|
|
| Assets |
|
|
|
|
| Beginning balance |
4
|
41
|
41
|
|
| Realized and Unrealized Gains (Losses) |
0
|
1
|
|
|
| Purchases |
0
|
2
|
|
|
| Sales |
(2)
|
(32)
|
|
|
| Issuances |
0
|
0
|
|
|
| Settlements |
0
|
0
|
|
|
| Net Transfers |
6
|
(1)
|
|
|
| Ending balance |
8
|
11
|
4
|
41
|
| Unrealized Gains (Losses) for Level 3 Assets Outstanding |
0
|
1
|
|
|
| Trading Assets | Corporate and Other Debt |
|
|
|
|
| Assets |
|
|
|
|
| Beginning balance |
7,538
|
8,044
|
8,044
|
|
| Realized and Unrealized Gains (Losses) |
(59)
|
161
|
|
|
| Purchases |
1,178
|
1,563
|
|
|
| Sales |
(653)
|
(831)
|
|
|
| Issuances |
0
|
0
|
|
|
| Settlements |
(351)
|
(2,065)
|
|
|
| Net Transfers |
(9)
|
192
|
|
|
| Ending balance |
7,644
|
7,064
|
7,538
|
8,044
|
| Unrealized Gains (Losses) for Level 3 Assets Outstanding |
(61)
|
95
|
|
|
| Trading Assets | Corporate and Other Debt | State and Municipal Securities |
|
|
|
|
| Assets |
|
|
|
|
| Beginning balance |
19
|
|
|
|
| Realized and Unrealized Gains (Losses) |
0
|
|
|
|
| Purchases |
0
|
|
|
|
| Sales |
(15)
|
|
|
|
| Issuances |
0
|
|
|
|
| Settlements |
0
|
|
|
|
| Net Transfers |
1
|
|
|
|
| Ending balance |
5
|
|
19
|
|
| Unrealized Gains (Losses) for Level 3 Assets Outstanding |
0
|
|
|
|
| Trading Assets | Corporate and Other Debt | Residential Mortgage-backed Securities |
|
|
|
|
| Assets |
|
|
|
|
| Beginning balance |
341
|
175
|
175
|
|
| Realized and Unrealized Gains (Losses) |
(24)
|
17
|
|
|
| Purchases |
19
|
58
|
|
|
| Sales |
(67)
|
(40)
|
|
|
| Issuances |
0
|
0
|
|
|
| Settlements |
0
|
0
|
|
|
| Net Transfers |
23
|
86
|
|
|
| Ending balance |
292
|
296
|
341
|
175
|
| Unrealized Gains (Losses) for Level 3 Assets Outstanding |
(17)
|
12
|
|
|
| Trading Assets | Corporate and Other Debt | Commercial Mortgage-backed Securities |
|
|
|
|
| Assets |
|
|
|
|
| Beginning balance |
72
|
96
|
96
|
|
| Realized and Unrealized Gains (Losses) |
(9)
|
(2)
|
|
|
| Purchases |
0
|
96
|
|
|
| Sales |
(15)
|
(10)
|
|
|
| Issuances |
0
|
0
|
|
|
| Settlements |
0
|
0
|
|
|
| Net Transfers |
11
|
0
|
|
|
| Ending balance |
59
|
180
|
72
|
96
|
| Unrealized Gains (Losses) for Level 3 Assets Outstanding |
(9)
|
(2)
|
|
|
| Trading Assets | Corporate and Other Debt | Asset-backed Securities |
|
|
|
|
| Assets |
|
|
|
|
| Beginning balance |
25
|
76
|
76
|
|
| Realized and Unrealized Gains (Losses) |
(1)
|
(2)
|
|
|
| Purchases |
1
|
57
|
|
|
| Sales |
(17)
|
(29)
|
|
|
| Issuances |
0
|
0
|
|
|
| Settlements |
0
|
0
|
|
|
| Net Transfers |
(4)
|
(35)
|
|
|
| Ending balance |
4
|
67
|
25
|
76
|
| Unrealized Gains (Losses) for Level 3 Assets Outstanding |
0
|
3
|
|
|
| Trading Assets | Corporate and Other Debt | Corporate Bonds |
|
|
|
|
| Assets |
|
|
|
|
| Beginning balance |
267
|
386
|
386
|
|
| Realized and Unrealized Gains (Losses) |
44
|
38
|
|
|
| Purchases |
17
|
129
|
|
|
| Sales |
(98)
|
(141)
|
|
|
| Issuances |
0
|
0
|
|
|
| Settlements |
0
|
0
|
|
|
| Net Transfers |
(6)
|
12
|
|
|
| Ending balance |
224
|
424
|
267
|
386
|
| Unrealized Gains (Losses) for Level 3 Assets Outstanding |
28
|
38
|
|
|
| Trading Assets | Corporate and Other Debt | Collateralized Debt and Loan Obligations |
|
|
|
|
| Assets |
|
|
|
|
| Beginning balance |
430
|
1,152
|
1,152
|
|
| Realized and Unrealized Gains (Losses) |
(14)
|
79
|
|
|
| Purchases |
114
|
241
|
|
|
| Sales |
(113)
|
(397)
|
|
|
| Issuances |
0
|
0
|
|
|
| Settlements |
0
|
(253)
|
|
|
| Net Transfers |
(69)
|
0
|
|
|
| Ending balance |
348
|
822
|
430
|
1,152
|
| Unrealized Gains (Losses) for Level 3 Assets Outstanding |
(4)
|
2
|
|
|
| Trading Assets | Corporate and Other Debt | Loans and Lending Commitments |
|
|
|
|
| Assets |
|
|
|
|
| Beginning balance |
5,936
|
5,874
|
5,874
|
|
| Realized and Unrealized Gains (Losses) |
(60)
|
41
|
|
|
| Purchases |
952
|
914
|
|
|
| Sales |
(319)
|
(213)
|
|
|
| Issuances |
0
|
0
|
|
|
| Settlements |
(351)
|
(1,807)
|
|
|
| Net Transfers |
27
|
(20)
|
|
|
| Ending balance |
6,185
|
4,789
|
5,936
|
5,874
|
| Unrealized Gains (Losses) for Level 3 Assets Outstanding |
(64)
|
40
|
|
|
| Trading Assets | Corporate and Other Debt | Other Debt |
|
|
|
|
| Assets |
|
|
|
|
| Beginning balance |
448
|
285
|
285
|
|
| Realized and Unrealized Gains (Losses) |
5
|
(10)
|
|
|
| Purchases |
75
|
68
|
|
|
| Sales |
(9)
|
(1)
|
|
|
| Issuances |
0
|
0
|
|
|
| Settlements |
0
|
(5)
|
|
|
| Net Transfers |
8
|
149
|
|
|
| Ending balance |
527
|
486
|
448
|
285
|
| Unrealized Gains (Losses) for Level 3 Assets Outstanding |
5
|
2
|
|
|
| Trading Assets | Corporate and Other Debt | Equity Contracts |
|
|
|
|
| Assets |
|
|
|
|
| Increase (Decrease) In Derivative Assets |
|
|
|
785
|
| Trading Assets | Corporate Equities |
|
|
|
|
| Assets |
|
|
|
|
| Beginning balance |
433
|
272
|
272
|
|
| Realized and Unrealized Gains (Losses) |
11
|
19
|
|
|
| Purchases |
78
|
30
|
|
|
| Sales |
(44)
|
(98)
|
|
|
| Issuances |
0
|
0
|
|
|
| Settlements |
0
|
0
|
|
|
| Net Transfers |
(48)
|
7
|
|
|
| Ending balance |
430
|
230
|
433
|
272
|
| Unrealized Gains (Losses) for Level 3 Assets Outstanding |
6
|
12
|
|
|
| Trading Assets | Net Derivative and Other Contracts |
|
|
|
|
| Assets |
|
|
|
|
| Beginning balance |
(1,424)
|
(1,784)
|
(1,784)
|
|
| Realized and Unrealized Gains (Losses) |
375
|
(35)
|
|
|
| Purchases |
151
|
53
|
|
|
| Sales |
0
|
0
|
|
|
| Issuances |
(203)
|
(217)
|
|
|
| Settlements |
169
|
78
|
|
|
| Net Transfers |
(128)
|
(405)
|
|
|
| Ending balance |
(1,060)
|
(2,310)
|
(1,424)
|
(1,784)
|
| Unrealized Gains (Losses) for Level 3 Assets Outstanding |
453
|
(133)
|
|
|
| Trading Assets | Net Derivative and Other Contracts | Interest Rate Contracts |
|
|
|
|
| Assets |
|
|
|
|
| Beginning balance |
260
|
(173)
|
(173)
|
|
| Realized and Unrealized Gains (Losses) |
470
|
128
|
|
|
| Purchases |
5
|
6
|
|
|
| Sales |
0
|
0
|
|
|
| Issuances |
(14)
|
(11)
|
|
|
| Settlements |
(30)
|
65
|
|
|
| Net Transfers |
(522)
|
(511)
|
|
|
| Ending balance |
169
|
(496)
|
260
|
(173)
|
| Unrealized Gains (Losses) for Level 3 Assets Outstanding |
411
|
119
|
|
|
| Trading Assets | Net Derivative and Other Contracts | Credit Contracts |
|
|
|
|
| Assets |
|
|
|
|
| Beginning balance |
(844)
|
(743)
|
(743)
|
|
| Realized and Unrealized Gains (Losses) |
28
|
(247)
|
|
|
| Purchases |
0
|
14
|
|
|
| Sales |
0
|
0
|
|
|
| Issuances |
0
|
(30)
|
|
|
| Settlements |
67
|
7
|
|
|
| Net Transfers |
26
|
15
|
|
|
| Ending balance |
(723)
|
(984)
|
(844)
|
(743)
|
| Unrealized Gains (Losses) for Level 3 Assets Outstanding |
24
|
(252)
|
|
|
| Trading Assets | Net Derivative and Other Contracts | Foreign Exchange Contracts |
|
|
|
|
| Assets |
|
|
|
|
| Beginning balance |
141
|
151
|
151
|
|
| Realized and Unrealized Gains (Losses) |
(61)
|
62
|
|
|
| Purchases |
0
|
0
|
|
|
| Sales |
0
|
0
|
|
|
| Issuances |
0
|
0
|
|
|
| Settlements |
(105)
|
97
|
|
|
| Net Transfers |
151
|
(13)
|
|
|
| Ending balance |
126
|
297
|
141
|
151
|
| Unrealized Gains (Losses) for Level 3 Assets Outstanding |
(38)
|
62
|
|
|
| Trading Assets | Net Derivative and Other Contracts | Equity Contracts |
|
|
|
|
| Assets |
|
|
|
|
| Beginning balance |
(2,031)
|
(2,165)
|
(2,165)
|
|
| Realized and Unrealized Gains (Losses) |
(135)
|
(273)
|
|
|
| Purchases |
137
|
33
|
|
|
| Sales |
0
|
0
|
|
|
| Issuances |
(128)
|
(176)
|
|
|
| Settlements |
294
|
(54)
|
|
|
| Net Transfers |
31
|
163
|
|
|
| Ending balance |
(1,832)
|
(2,472)
|
(2,031)
|
(2,165)
|
| Unrealized Gains (Losses) for Level 3 Assets Outstanding |
(12)
|
(324)
|
|
|
| Trading Assets | Net Derivative and Other Contracts | Commodity Contracts |
|
|
|
|
| Assets |
|
|
|
|
| Beginning balance |
1,050
|
1,146
|
1,146
|
|
| Realized and Unrealized Gains (Losses) |
73
|
295
|
|
|
| Purchases |
9
|
0
|
|
|
| Sales |
0
|
0
|
|
|
| Issuances |
(61)
|
0
|
|
|
| Settlements |
(57)
|
(37)
|
|
|
| Net Transfers |
186
|
(59)
|
|
|
| Ending balance |
1,200
|
1,345
|
1,050
|
1,146
|
| Unrealized Gains (Losses) for Level 3 Assets Outstanding |
68
|
262
|
|
|
| Trading Assets | Investments |
|
|
|
|
| Assets |
|
|
|
|
| Beginning balance |
707
|
1,158
|
1,158
|
|
| Realized and Unrealized Gains (Losses) |
(31)
|
5
|
|
|
| Purchases |
365
|
13
|
|
|
| Sales |
(54)
|
(39)
|
|
|
| Issuances |
0
|
0
|
|
|
| Settlements |
(41)
|
0
|
|
|
| Net Transfers |
(24)
|
83
|
|
|
| Ending balance |
922
|
1,220
|
707
|
1,158
|
| Unrealized Gains (Losses) for Level 3 Assets Outstanding |
(31)
|
(1)
|
|
|
| Trading Assets | Investments | Principal Investments |
|
|
|
|
| Assets |
|
|
|
|
| Beginning balance |
486
|
835
|
835
|
|
| Realized and Unrealized Gains (Losses) |
(43)
|
17
|
|
|
| Purchases |
365
|
11
|
|
|
| Sales |
(29)
|
(34)
|
|
|
| Issuances |
0
|
0
|
|
|
| Settlements |
(41)
|
0
|
|
|
| Net Transfers |
5
|
0
|
|
|
| Ending balance |
743
|
829
|
486
|
835
|
| Unrealized Gains (Losses) for Level 3 Assets Outstanding |
(43)
|
9
|
|
|
| Trading Assets | Investments | Other Investments |
|
|
|
|
| Assets |
|
|
|
|
| Beginning balance |
221
|
323
|
323
|
|
| Realized and Unrealized Gains (Losses) |
12
|
(12)
|
|
|
| Purchases |
0
|
2
|
|
|
| Sales |
(25)
|
(5)
|
|
|
| Issuances |
0
|
0
|
|
|
| Settlements |
0
|
0
|
|
|
| Net Transfers |
(29)
|
83
|
|
|
| Ending balance |
179
|
391
|
221
|
323
|
| Unrealized Gains (Losses) for Level 3 Assets Outstanding |
12
|
(10)
|
|
|
| Trading Liabilities | Corporate and Other Debt |
|
|
|
|
| Liabilities |
|
|
|
|
| Beginning balance |
4
|
121
|
121
|
|
| Realized and Unrealized Gains (Losses) |
(2)
|
(7)
|
|
|
| Purchases |
(2)
|
(12)
|
|
|
| Sales |
16
|
13
|
|
|
| Issuances |
0
|
0
|
|
|
| Settlements |
0
|
0
|
|
|
| Net Transfers |
(5)
|
(69)
|
|
|
| Ending balance |
11
|
46
|
4
|
121
|
| Unrealized Gains (Losses) for Level 3 Liabilities Outstanding |
2
|
7
|
|
|
| Trading Liabilities | Corporate and Other Debt | Corporate Bonds |
|
|
|
|
| Liabilities |
|
|
|
|
| Beginning balance |
0
|
78
|
78
|
|
| Realized and Unrealized Gains (Losses) |
4
|
4
|
|
|
| Purchases |
(2)
|
(1)
|
|
|
| Sales |
9
|
8
|
|
|
| Issuances |
0
|
0
|
|
|
| Settlements |
0
|
0
|
|
|
| Net Transfers |
(5)
|
(66)
|
|
|
| Ending balance |
6
|
23
|
0
|
78
|
| Unrealized Gains (Losses) for Level 3 Liabilities Outstanding |
(4)
|
(4)
|
|
|
| Trading Liabilities | Corporate and Other Debt | Lending Commitments |
|
|
|
|
| Liabilities |
|
|
|
|
| Beginning balance |
0
|
5
|
5
|
|
| Realized and Unrealized Gains (Losses) |
1
|
(5)
|
|
|
| Purchases |
0
|
0
|
|
|
| Sales |
0
|
0
|
|
|
| Issuances |
0
|
0
|
|
|
| Settlements |
0
|
0
|
|
|
| Net Transfers |
0
|
0
|
|
|
| Ending balance |
1
|
0
|
0
|
5
|
| Unrealized Gains (Losses) for Level 3 Liabilities Outstanding |
(1)
|
5
|
|
|
| Trading Liabilities | Corporate and Other Debt | Other Debt |
|
|
|
|
| Liabilities |
|
|
|
|
| Beginning balance |
4
|
38
|
38
|
|
| Realized and Unrealized Gains (Losses) |
(7)
|
(6)
|
|
|
| Purchases |
0
|
(11)
|
|
|
| Sales |
7
|
5
|
|
|
| Issuances |
0
|
0
|
|
|
| Settlements |
0
|
0
|
|
|
| Net Transfers |
0
|
(3)
|
|
|
| Ending balance |
4
|
23
|
4
|
38
|
| Unrealized Gains (Losses) for Level 3 Liabilities Outstanding |
7
|
6
|
|
|
| Trading Liabilities | Corporate Equities |
|
|
|
|
| Liabilities |
|
|
|
|
| Beginning balance |
17
|
45
|
45
|
|
| Realized and Unrealized Gains (Losses) |
4
|
(1)
|
|
|
| Purchases |
(15)
|
0
|
|
|
| Sales |
13
|
7
|
|
|
| Issuances |
0
|
0
|
|
|
| Settlements |
0
|
0
|
|
|
| Net Transfers |
12
|
(1)
|
|
|
| Ending balance |
31
|
50
|
$ 17
|
$ 45
|
| Unrealized Gains (Losses) for Level 3 Liabilities Outstanding |
$ (4)
|
$ 1
|
|
|