Fair Value, Assets and Liabilities Measured on Recurring Basis Level 3 Reconciliation Breakout (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Equity securities [Member]
Assets:
Purchases	$ 0	$ 0	$ 0	$ 0
Sales	0	0	(1)	(17)
Issuances	0	0	0	0
Settlements	0	(295)	0	(374)
Net	0	(295)	(1)	(391)
Nonmarketable equity securities [Member]
Assets:
Purchases	0	0	0	0
Sales	0	0	(1)	(17)
Issuances	0	0	0	0
Settlements	0	(295)	0	(374)
Net	0	(295)	(1)	(391)
Trading debt securities [Member] \| Debt securities [Member]
Assets:
Purchases	110	83	295	362
Sales	(107)	(71)	(263)	(303)
Issuances	0	0	0	0
Settlements	(17)	(31)	(24)	(131)
Net	(14)	(19)	8	(72)
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	3	8	14	16
Sales	(7)	(1)	(11)	(3)
Issuances	0	0	0	0
Settlements	0	0	0	0
Net	(4)	7	3	13
Trading debt securities [Member] \| Collateralized loan obligations [Member]
Assets:
Purchases	107	75	281	346
Sales	(100)	(70)	(252)	(300)
Issuances	0	0	0	0
Settlements	(11)	(31)	(16)	(131)
Net	(4)	(26)	13	(85)
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	(6)	0	(6)	0
Net	(6)	0	(6)	0
Available-for-sale securities [Member] \| Debt securities [Member]
Assets:
Purchases	1	0	12	31
Sales	(4)	(149)	(9)	(161)
Issuances	22	165	200	233
Settlements	(179)	(242)	(565)	(622)
Net	(160)	(226)	(362)	(519)
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	12	69	67	79
Settlements	(50)	(30)	(115)	(126)
Net	(38)	39	(48)	(51)
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	(3)	(12)	(3)	(33)
Net	(3)	(12)	(3)	(33)
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	(1)	0	(1)
Net	0	(1)	0	(1)
Available-for-sale securities [Member] \| Commercial [Member]
Assets:
Purchases	0	0	0	0
Sales	0	0	0	0
Issuances	0	0	0	0
Settlements	(3)	(11)	(3)	(32)
Net	(3)	(11)	(3)	(32)
Available-for-sale securities [Member] \| Corporate debt securities [Member]
Assets:
Purchases	1	0	12	31
Sales	0	0	0	0
Issuances	0	0	0	0
Settlements	(15)	(55)	(17)	(56)
Net	(14)	(55)	(5)	(25)
Available-for-sale securities [Member] \| Collateralized loan obligations [Member]
Assets:
Purchases	0	0	0	0
Sales	0	(149)	0	(149)
Issuances	0	0	0	0
Settlements	(33)	(56)	(187)	(103)
Net	(33)	(205)	(187)	(252)
Available-for-sale securities [Member] \| Asset-backed securities [Member]
Assets:
Purchases	0	0	0	0
Sales	(4)	0	(9)	(8)
Issuances	10	96	133	154
Settlements	(78)	(89)	(243)	(304)
Net	(72)	7	(119)	(158)
Available-for-sale securities [Member] \| Other asset-backed securities [Member]
Assets:
Purchases	0	0	0	0
Sales	(4)	0	(9)	(8)
Issuances	10	96	133	154
Settlements	(78)	(89)	(243)	(304)
Net	(72)	7	(119)	(158)
Mortgage loans held for sale [Member]
Assets:
Purchases	23	17	69	64
Sales	(45)	(89)	(185)	(240)
Issuances	87	104	187	271
Settlements	(71)	(40)	(165)	(115)
Net	(6)	(8)	(94)	(20)
Loans held for sale [Member]
Assets:
Purchases	0	1	12	1
Sales	0	0	(2)	(16)
Issuances	0	0	0	0
Settlements	(12)	0	(14)	0
Net	(12)	1	(4)	(15)
Loans [Member]
Assets:
Purchases	1	2	3	3
Sales	0	0	0	0
Issuances	2	5	7	13
Settlements	(20)	(42)	(70)	(105)
Net	(17)	(35)	(60)	(89)
Mortgage servicing rights [Member]
Assets:
Purchases	0	0	0	0
Sales	(4)	(2)	(286)	(7)
Issuances	538	502	1,279	1,561
Settlements	0	0	0	0
Net	534	500	993	1,554
Derivative [Member]
Assets and Liabilities:
Purchases	4	4	12	12
Sales	(3)	(39)	(6)	(43)
Issuances	(1)	0	(1)	0
Settlements	159	168	(57)	493
Net	159	133	(52)	462
Derivative [Member] \| Interest rate contract [Member]
Assets and Liabilities:
Purchases	0	0	0	0
Sales	0	0	0	0
Issuances	(1)	0	(1)	0
Settlements	(132)	36	(376)	332
Net	(133)	36	(377)	332
Derivative [Member] \| Commodity contract [Member]
Assets and Liabilities:
Purchases	0	0	0	0
Sales	0	0	0	0
Issuances	0	0	0	0
Settlements	61	6	152	(20)
Net	61	6	152	(20)
Derivative [Member] \| Equity contract [Member]
Assets and Liabilities:
Purchases	0	3	0	3
Sales	0	(37)	0	(37)
Issuances	0	0	0	0
Settlements	263	123	194	187
Net	263	89	194	153
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	(33)	4	(27)	7
Net	(33)	4	(27)	7
Derivative [Member] \| Credit contract [Member]
Assets and Liabilities:
Purchases	4	1	12	9
Sales	(3)	(2)	(6)	(6)
Issuances	0	0	0	0
Settlements	0	(1)	0	(13)
Net	1	(2)	6	(10)
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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