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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Equity securities [Member]
Assets:
Purchases	$ 0	$ 0	$ 0	$ 0
Sales	0	0	(1)	(17)
Issuances	0	0	0	0
Settlements	0	0	0	(79)
Net	0	0	(1)	(96)
Nonmarketable equity securities [Member]
Assets:
Purchases	0	0	0	0
Sales	0	0	(1)	(17)
Issuances	0	0	0	0
Settlements	0	0	0	(79)
Net	0	0	(1)	(96)
Trading debt securities [Member] \| Debt securities [Member]
Assets:
Purchases	50	93	185	279
Sales	(68)	(40)	(156)	(232)
Issuances	0	0	0	0
Settlements	(3)	(69)	(7)	(100)
Net	(21)	(16)	22	(53)
Trading debt securities [Member] \| Securities of U.S. states and political subdivisions [Member]
Assets:
Purchases	0	0	0	0
Sales	0	0	0	0
Issuances	0	0	0	0
Settlements	0	0	(2)	0
Net	0	0	(2)	0
Trading debt securities [Member] \| Corporate debt securities [Member]
Assets:
Purchases	6	4	11	8
Sales	(3)	(1)	(4)	(2)
Issuances	0	0	0	0
Settlements	0	0	0	0
Net	3	3	7	6
Trading debt securities [Member] \| Collateralized loan obligations [Member]
Assets:
Purchases	44	89	174	271
Sales	(65)	(39)	(152)	(230)
Issuances	0	0	0	0
Settlements	(3)	(69)	(5)	(100)
Net	(24)	(19)	17	(59)
Trading debt securities [Member] \| Other trading debt 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
Available-for-sale securities [Member] \| Debt securities [Member]
Assets:
Purchases	8	31	11	31
Sales	(2)	0	(5)	(12)
Issuances	63	9	178	68
Settlements	(223)	(194)	(386)	(380)
Net	(154)	(154)	(202)	(293)
Available-for-sale securities [Member] \| Securities of U.S. states and political subdivisions [Member]
Assets:
Purchases	0	0	0	0
Sales	0	0	0	(4)
Issuances	6	0	55	10
Settlements	(39)	(49)	(65)	(96)
Net	(33)	(49)	(10)	(90)
Available-for-sale securities [Member] \| Mortgage-backed securities [Member]
Assets:
Purchases	0	0	0	0
Sales	0	0	0	0
Issuances	0	0	0	0
Settlements	0	(13)	0	(21)
Net	0	(13)	0	(21)
Available-for-sale securities [Member] \| Residential [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
Available-for-sale securities [Member] \| Commercial [Member]
Assets:
Purchases	0	0	0	0
Sales	0	0	0	0
Issuances	0	0	0	0
Settlements	0	(13)	0	(21)
Net	0	(13)	0	(21)
Available-for-sale securities [Member] \| Corporate debt securities [Member]
Assets:
Purchases	8	31	11	31
Sales	0	0	0	0
Issuances	0	0	0	0
Settlements	(1)	0	(2)	(1)
Net	7	31	9	30
Available-for-sale securities [Member] \| Collateralized loan obligations [Member]
Assets:
Purchases	0	0	0	0
Sales	0	0	0	0
Issuances	0	0	0	0
Settlements	(107)	(24)	(154)	(47)
Net	(107)	(24)	(154)	(47)
Available-for-sale securities [Member] \| Asset-backed securities [Member]
Assets:
Purchases	0	0	0	0
Sales	(2)	0	(5)	(8)
Issuances	57	9	123	58
Settlements	(76)	(108)	(165)	(215)
Net	(21)	(99)	(47)	(165)
Available-for-sale securities [Member] \| Other asset-backed securities [Member]
Assets:
Purchases	0	0	0	0
Sales	(2)	0	(5)	(8)
Issuances	57	9	123	58
Settlements	(76)	(108)	(165)	(215)
Net	(21)	(99)	(47)	(165)
Mortgage loans held for sale [Member]
Assets:
Purchases	30	20	46	47
Sales	(47)	(68)	(140)	(151)
Issuances	54	109	100	167
Settlements	(59)	(36)	(94)	(75)
Net	(22)	25	(88)	(12)
Loans held for sale [Member]
Assets:
Purchases	0	0	12	0
Sales	(1)	0	(2)	(16)
Issuances	0	0	0	0
Settlements	(2)	0	(2)	0
Net	(3)	0	8	(16)
Loans [Member]
Assets:
Purchases	0	0	2	1
Sales	0	0	0	0
Issuances	2	4	5	8
Settlements	(26)	(35)	(50)	(63)
Net	(24)	(31)	(43)	(54)
Mortgage servicing rights [Member]
Assets:
Purchases	0	0	0	0
Sales	(1)	(1)	(282)	(5)
Issuances	400	486	741	1,059
Settlements	0	0	0	0
Net	399	485	459	1,054
Derivative [Member]
Assets and Liabilities:
Purchases	2	5	8	8
Sales	(3)	(2)	(3)	(4)
Issuances	0	0	0	0
Settlements	(132)	15	(216)	325
Net	(133)	18	(211)	329
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	(133)	30	(244)	296
Net	(133)	30	(244)	296
Derivative [Member] \| Commodity contract [Member]
Assets and Liabilities:
Purchases	0	0	0	0
Sales	0	0	0	0
Issuances	0	0	0	0
Settlements	64	(2)	91	(26)
Net	64	(2)	91	(26)
Derivative [Member] \| Equity contract [Member]
Assets and Liabilities:
Purchases	0	0	0	0
Sales	0	0	0	0
Issuances	0	0	0	0
Settlements	(66)	(7)	(69)	64
Net	(66)	(7)	(69)	64
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	3	2	6	3
Net	3	2	6	3
Derivative [Member] \| Credit contract [Member]
Assets and Liabilities:
Purchases	2	5	8	8
Sales	(3)	(2)	(3)	(4)
Issuances	0	0	0	0
Settlements	0	(8)	0	(12)
Net	(1)	(5)	5	(8)
Other liabilities [Member]
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

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