Fair Value, Assets and Liabilities Measured on Recurring Basis Level 3 Reconciliation Breakout (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Trading securities and trading assets, excluding derivatives [Member]
Assets:
Purchases	$ 523	$ 138	$ 941	$ 492
Sales	(513)	(193)	(1,037)	(511)
Issuances	0	0	0	0
Settlements	(10)	(7)	(19)	(19)
Net	0	(62)	(115)	(38)
Trading assets (excluding derivatives) [Member]
Assets:
Purchases	523	137	938	491
Sales	(512)	(192)	(1,036)	(510)
Issuances	0	0	0	0
Settlements	(10)	(7)	(19)	(19)
Net	1	(62)	(117)	(38)
Trading assets (excluding derivatives) [Member] | Securities of U.S. states and political subdivisions [Member]
Assets:
Purchases	3	1	3	6
Sales	(1)	(1)	(2)	(5)
Issuances	0	0	0	0
Settlements	0	(1)	0	(1)
Net	2	(1)	1	0
Trading assets (excluding derivatives) [Member] | Mortgage-Backed Securities [Member]
Assets:
Purchases	0	0	0	0
Sales	0	0	0	0
Issuances	0	0	0	0
Settlements	0	0	0	0
Net	0	0	0	0
Trading assets (excluding derivatives) [Member] | Collateralized loan and other debt obligations [Member]
Assets:
Purchases	508	127	908	451
Sales	(503)	(151)	(988)	(421)
Issuances	0	0	0	0
Settlements	0	(2)	0	(4)
Net	5	(26)	(80)	26
Trading assets (excluding derivatives) [Member] | Corporate debt securities [Member]
Assets:
Purchases	12	8	27	23
Sales	(8)	(34)	(41)	(40)
Issuances	0	0	0	0
Settlements	0	6	0	6
Net	4	(20)	(14)	(11)
Trading assets (excluding derivatives) [Member] | Asset-backed securities [Member]
Assets:
Purchases	0	1	0	11
Sales	0	(6)	(5)	(44)
Issuances	0	0	0	0
Settlements	0	(10)	(9)	(20)
Net	0	(15)	(14)	(53)
Trading assets (excluding derivatives) [Member] | Equity Securities [Member]
Assets:
Purchases	0	0	0	0
Sales	0	0	0	0
Issuances	0	0	0	0
Settlements	(10)	0	(10)	0
Net	(10)	0	(10)	0
Other trading assets [Member]
Assets:
Purchases	0	1	3	1
Sales	(1)	(1)	(1)	(1)
Issuances	0	0	0	0
Settlements	0	0	0	0
Net	(1)	0	2	0
Available-for-sale securities [Member]
Assets:
Purchases	51	91	155	300
Sales	(128)	(13)	(179)	(149)
Issuances	418	306	532	392
Settlements	(433)	(394)	(1,035)	(1,447)
Net	(92)	(10)	(527)	(904)
Available-for-sale securities [Member] | Debt Securities [Member]
Assets:
Purchases	51	91	155	300
Sales	(128)	(9)	(179)	(145)
Issuances	418	306	532	392
Settlements	(433)	(391)	(1,011)	(1,424)
Net	(92)	(3)	(503)	(877)
Available-for-sale securities [Member] | Securities of U.S. states and political subdivisions [Member]
Assets:
Purchases	0	0	0	73
Sales	(21)	0	(41)	(55)
Issuances	239	257	294	268
Settlements	(277)	(150)	(553)	(311)
Net	(59)	107	(300)	(25)
Available-for-sale securities [Member] | Mortgage-Backed Securities [Member]
Assets:
Purchases	0	0	0	0
Sales	0	(1)	(27)	(37)
Issuances	0	0	0	0
Settlements	0	0	0	(3)
Net	0	(1)	(27)	(40)
Available-for-sale securities [Member] | Residential [Member]
Assets:
Purchases	0	0	0	0
Sales	0	(1)	(22)	(29)
Issuances	0	0	0	0
Settlements	0	0	0	(2)
Net	0	(1)	(22)	(31)
Available-for-sale securities [Member] | Commercial [Member]
Assets:
Purchases	0	0	0	0
Sales	0	0	(5)	(8)
Issuances	0	0	0	0
Settlements	0	0	0	(1)
Net	0	0	(5)	(9)
Available-for-sale securities [Member] | Collateralized loan and other debt obligations [Member]
Assets:
Purchases	15	9	59	133
Sales	(99)	0	(102)	(32)
Issuances	0	0	0	0
Settlements	(82)	(122)	(170)	(244)
Net	(166)	(113)	(213)	(143)
Available-for-sale securities [Member] | Corporate debt securities [Member]
Assets:
Purchases	36	7	96	7
Sales	(8)	(8)	(8)	(9)
Issuances	0	(1)	0	10
Settlements	(6)	(8)	(6)	(13)
Net	22	(10)	82	(5)
Available-for-sale securities [Member] | Asset-backed securities [Member]
Assets:
Purchases	0	75	0	87
Sales	0	0	(1)	(12)
Issuances	179	50	238	114
Settlements	(68)	(111)	(282)	(853)
Net	111	14	(45)	(664)
Available-for-sale securities [Member] | Auto loans and leases [Member]
Assets:
Purchases	0	0	0	0
Sales	0	0	0	0
Issuances	0	0	0	0
Settlements	0	0	0	(215)
Net	0	0	0	(215)
Available-for-sale securities [Member] | Other asset-backed securities [Member]
Assets:
Purchases	0	75	0	87
Sales	0	0	(1)	(12)
Issuances	179	50	238	114
Settlements	(68)	(111)	(282)	(638)
Net	111	14	(45)	(449)
Available-for-sale securities [Member] | Equity Securities [Member]
Assets:
Purchases	0	0	0	0
Sales	0	(4)	0	(4)
Issuances	0	0	0	0
Settlements	0	(3)	(24)	(23)
Net	0	(7)	(24)	(27)
Available-for-sale securities [Member] | Perpetual preferred securities [Member]
Assets:
Purchases	0	0	0	0
Sales	0	0	0	0
Issuances	0	0	0	0
Settlements	0	(3)	(24)	(23)
Net	0	(3)	(24)	(23)
Available-for-sale securities [Member] | Equity Securities, Other 1 [Member]
Assets:
Purchases	0	0	0	0
Sales	0	(4)	0	(4)
Issuances	0	0	0	0
Settlements	0	0	0	0
Net	0	(4)	0	(4)
Mortgages held for sale [Member]
Assets:
Purchases	67	59	120	106
Sales	(332)	0	(623)	(21)
Issuances	226	0	346	0
Settlements	(102)	(88)	(212)	(160)
Net	(141)	(29)	(369)	(75)
Loans [Member]
Assets:
Purchases	1	1	67	2
Sales	0	0	0	0
Issuances	99	104	194	206
Settlements	(138)	(141)	(351)	(231)
Net	(38)	(36)	(90)	(23)
Mortgage servicing rights [Member]
Assets:
Purchases	0	0	0	0
Sales	0	0	(1)	0
Issuances	428	271	736	560
Settlements	(5)	0	(5)	0
Net	423	271	730	560
Derivative [Member]
Assets and Liabilities:
Purchases	19	2	21	2
Sales	(41)	15	(73)	(43)
Issuances	0	0	0	0
Settlements	(109)	(567)	(430)	(642)
Net	(131)	(550)	(482)	(683)
Derivative [Member] | Interest rate contract [Member]
Assets and Liabilities:
Purchases	0	0	0	0
Sales	0	0	0	0
Issuances	0	0	0	0
Settlements	(129)	(426)	(466)	(690)
Net	(129)	(426)	(466)	(690)
Derivative [Member] | Commodity contract [Member]
Assets and Liabilities:
Purchases	0	0	0	0
Sales	0	0	0	0
Issuances	0	0	0	0
Settlements	2	(2)	2	(1)
Net	2	(2)	2	(1)
Derivative [Member] | Equity contract [Member]
Assets and Liabilities:
Purchases	15	0	15	0
Sales	(39)	(57)	(71)	(115)
Issuances	0	0	0	0
Settlements	(14)	(58)	(33)	39
Net	(38)	(115)	(89)	(76)
Derivative [Member] | Foreign exchange contract [Member]
Assets and Liabilities:
Purchases	0	0	0	0
Sales	0	0	0	0
Issuances	0	0	0	0
Settlements	0	(7)	0	(12)
Net	0	(7)	0	(12)
Derivative [Member] | Credit contract [Member]
Assets and Liabilities:
Purchases	4	2	6	2
Sales	(2)	72	(2)	72
Issuances	0	0	0	0
Settlements	32	(74)	67	22
Net	34	0	71	96
Derivative [Member] | Other contract [Member]
Assets and Liabilities:
Purchases	0	0	0	0
Sales	0	0	0	0
Issuances	0	0	0	0
Settlements	0	0	0	0
Net	0	0	0	0
Other assets [Member]
Assets:
Purchases	96	1	96	609
Sales	(1)	(1)	(1)	(1)
Issuances	0	0	0	0
Settlements	(5)	(5)	(8)	(13)
Net	90	(5)	87	595
Short sale liabilities [Member]
Liabilities:
Purchases	14	11	20	6
Sales	0	(5)	(15)	(5)
Issuances	0	0	0	0
Settlements	0	0	0	0
Net	14	6	5	1
Other liabilities [Member]
Liabilities:
Purchases	0	0	0	0
Sales	0	0	0	0
Issuances	0	0	0	0
Settlements	0	(1)	0	1
Net	$ 0	$ (1)	$ 0	$ 1