Fair Value, Assets and Liabilities Recorded at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions		Jun. 30, 2019	Dec. 31, 2018
Assets:
Trading debt securities		$ 70,208	$ 69,989
Available-for-sale, at fair value		265,983	269,912
Mortgage servicing rights		12,096	14,649
Derivative assets		40,050	34,560
Net amounts in consolidated balance sheet, assets		13,162	10,770
Marketable equity securities		35,950	29,556
Equity securities	[1]	61,537	55,148
Liabilities:
Total derivative liabilities		(38,116)	(32,047)
Fair value liability derivatives, net		(8,399)	(8,499)
Interest rate contract [Member]
Assets:
Net amounts in consolidated balance sheet, assets		8,995	6,406
Liabilities:
Fair value liability derivatives, net		(2,591)	(3,156)
Commodity contract [Member]
Assets:
Net amounts in consolidated balance sheet, assets		473	739
Liabilities:
Fair value liability derivatives, net		(1,198)	(1,609)
Equity contract [Member]
Assets:
Net amounts in consolidated balance sheet, assets		2,336	2,227
Liabilities:
Fair value liability derivatives, net		(3,244)	(2,133)
Foreign exchange contract [Member]
Assets:
Net amounts in consolidated balance sheet, assets		1,305	1,359
Liabilities:
Fair value liability derivatives, net		(1,350)	(1,591)
US Treasury and Government [Member]
Assets:
Available-for-sale, at fair value		15,319	13,348
Securities of U.S. states and political subdivisions [Member]
Assets:
Available-for-sale, at fair value		45,095	49,264
Mortgage-backed securities [Member]
Assets:
Available-for-sale, at fair value		161,301	160,203
Federal agencies [Member]
Assets:
Available-for-sale, at fair value		155,858	153,203
Residential [Member]
Assets:
Available-for-sale, at fair value		1,263	2,775
Commercial [Member]
Assets:
Available-for-sale, at fair value		4,180	4,225
Corporate debt securities [Member]
Assets:
Available-for-sale, at fair value		6,230	6,271
Collateralized loan obligations [Member]
Assets:
Available-for-sale, at fair value		32,995	35,343
Collateralized debt obligations [Member]
Assets:
Available-for-sale, at fair value		649	800
Other debt securities [Member]
Assets:
Available-for-sale, at fair value		5,043	5,483
Fair Value, Measurements, Recurring [Member]
Assets:
Mortgage loans held for sale		16,343	11,771
Loans held for sale		1,118	1,469
Loans		202	244
Mortgage servicing rights		12,096	14,649
Fair value asset derivatives, netting		(26,888)	(23,790)
Net amounts in consolidated balance sheet, assets		13,162	10,770
Total assets recorded at fair value		415,062	408,360
Liabilities:
Fair value liability derivatives, netting		29,717	23,548
Fair value liability derivatives, net		(8,399)	(8,499)
Total short sale liabilities		(15,955)	(19,720)
Other liabilities (2)		(2)	(2)
Total liabilities recorded at fair value		(24,356)	(28,221)
Fair Value, Measurements, Recurring [Member] | Excluding NAV Investments [Member]
Assets:
Total assets recorded at fair value		414,944	408,258
Fair Value, Measurements, Recurring [Member] | Interest rate contract [Member]
Assets:
Derivative assets		25,553	18,435
Liabilities:
Total derivative liabilities		(20,637)	(16,308)
Fair Value, Measurements, Recurring [Member] | Commodity contract [Member]
Assets:
Derivative assets		1,424	1,588
Liabilities:
Total derivative liabilities		(1,936)	(2,336)
Fair Value, Measurements, Recurring [Member] | Equity contract [Member]
Assets:
Derivative assets		7,377	7,545
Liabilities:
Total derivative liabilities		(9,178)	(6,010)
Fair Value, Measurements, Recurring [Member] | Foreign exchange contract [Member]
Assets:
Derivative assets		5,555	6,714
Liabilities:
Total derivative liabilities		(6,268)	(7,113)
Fair Value, Measurements, Recurring [Member] | Credit Risk Contract [Member]
Assets:
Derivative assets		141	278
Liabilities:
Total derivative liabilities		(97)	(280)
Fair Value, Measurements, Recurring [Member] | Debt securities [Member]
Assets:
Trading debt securities		70,208	69,989
Available-for-sale, at fair value		265,983	269,912
Fair Value, Measurements, Recurring [Member] | US Treasury and Government [Member]
Assets:
Trading debt securities		18,225	23,417
Available-for-sale, at fair value		15,319	13,348
Liabilities:
Total short sale liabilities		(7,998)	(12,261)
Fair Value, Measurements, Recurring [Member] | Securities of U.S. states and political subdivisions [Member]
Assets:
Trading debt securities		3,314	3,275
Available-for-sale, at fair value		45,095	49,264
Fair Value, Measurements, Recurring [Member] | Other trading debt securities [Member]
Assets:
Trading debt securities		27	22
Fair Value, Measurements, Recurring [Member] | Mortgage-backed securities [Member]
Assets:
Trading debt securities		35,186	30,715
Available-for-sale, at fair value		161,301	160,203
Fair Value, Measurements, Recurring [Member] | Federal agencies [Member]
Assets:
Available-for-sale, at fair value		155,858	153,203
Fair Value, Measurements, Recurring [Member] | Residential [Member]
Assets:
Available-for-sale, at fair value		1,263	2,775
Fair Value, Measurements, Recurring [Member] | Commercial [Member]
Assets:
Available-for-sale, at fair value		4,180	4,225
Fair Value, Measurements, Recurring [Member] | Mortgage backed securities, other [Member]
Liabilities:
Total short sale liabilities		(533)	(47)
Fair Value, Measurements, Recurring [Member] | Corporate debt securities [Member]
Assets:
Trading debt securities		11,365	10,757
Available-for-sale, at fair value		6,230	6,271
Liabilities:
Total short sale liabilities		(4,887)	(4,505)
Fair Value, Measurements, Recurring [Member] | Collateralized loan obligations [Member]
Assets:
Trading debt securities		1,007	910
Available-for-sale, at fair value		32,995	35,343
Fair Value, Measurements, Recurring [Member] | Asset-backed securities [Member]
Assets:
Trading debt securities		1,084	893
Available-for-sale, at fair value		5,036	5,482
Liabilities:
Total short sale liabilities		(10)
Fair Value, Measurements, Recurring [Member] | Auto loans and leases [Member]
Assets:
Available-for-sale, at fair value		889	925
Fair Value, Measurements, Recurring [Member] | Home equity loans [Member]
Assets:
Available-for-sale, at fair value		14	112
Fair Value, Measurements, Recurring [Member] | Other asset-backed securities [Member]
Assets:
Available-for-sale, at fair value		4,133	4,445
Fair Value, Measurements, Recurring [Member] | Other debt securities [Member]
Assets:
Available-for-sale, at fair value		7	1
Fair Value, Measurements, Recurring [Member] | Equity securities [Member]
Liabilities:
Total short sale liabilities		(2,527)	(2,904)
Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Excluding NAV Investments [Member]
Assets:
Equity securities		35,832	29,454
Fair Value, Measurements, Recurring [Member] | Marketable equity securities [Member] | Excluding NAV Investments [Member]
Assets:
Marketable equity securities		28,706	23,962
Fair Value, Measurements, Recurring [Member] | Nonmarketable equity securities [Member] | Excluding NAV Investments [Member]
Assets:
Nonmarketable equity securities		7,126	5,492
Fair Value, Measurements, Recurring [Member] | Other securities sold, not yet purchased [Member]
Liabilities:
Total short sale liabilities		0	(3)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Assets:
Mortgage loans held for sale		0	0
Loans held for sale		0	0
Loans		0	0
Mortgage servicing rights		0	0
Fair value asset derivatives, netting		0	0
Net amounts in consolidated balance sheet, assets		2,219	1,711
Liabilities:
Fair value liability derivatives, netting		0	0
Fair value liability derivatives, net		(1,577)	(1,525)
Total short sale liabilities		(10,295)	(14,752)
Other liabilities (2)		0	0
Total liabilities recorded at fair value		(11,872)	(16,277)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Excluding NAV Investments [Member]
Assets:
Total assets recorded at fair value		58,037	55,874
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Interest rate contract [Member]
Assets:
Derivative assets		45	46
Liabilities:
Total derivative liabilities		(55)	(21)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Commodity contract [Member]
Assets:
Derivative assets		0	0
Liabilities:
Total derivative liabilities		0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Equity contract [Member]
Assets:
Derivative assets		2,162	1,648
Liabilities:
Total derivative liabilities		(1,509)	(1,492)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign exchange contract [Member]
Assets:
Derivative assets		12	17
Liabilities:
Total derivative liabilities		(13)	(12)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Credit Risk Contract [Member]
Assets:
Derivative assets		0	0
Liabilities:
Total derivative liabilities		0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Debt securities [Member]
Assets:
Trading debt securities		15,010	20,525
Available-for-sale, at fair value		12,361	10,433
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US Treasury and Government [Member]
Assets:
Trading debt securities		15,010	20,525
Available-for-sale, at fair value		12,324	10,399
Liabilities:
Total short sale liabilities		(7,768)	(11,850)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Securities of U.S. states and political subdivisions [Member]
Assets:
Trading debt securities		0	0
Available-for-sale, at fair value		0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other trading debt securities [Member]
Assets:
Trading debt securities		0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Mortgage-backed securities [Member]
Assets:
Trading debt securities		0	0
Available-for-sale, at fair value		0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Federal agencies [Member]
Assets:
Available-for-sale, at fair value		0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Residential [Member]
Assets:
Available-for-sale, at fair value		0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Commercial [Member]
Assets:
Available-for-sale, at fair value		0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Mortgage backed securities, other [Member]
Liabilities:
Total short sale liabilities		0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Corporate debt securities [Member]
Assets:
Trading debt securities		0	0
Available-for-sale, at fair value		37	34
Liabilities:
Total short sale liabilities		0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Collateralized loan obligations [Member]
Assets:
Trading debt securities		0	0
Available-for-sale, at fair value		0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Asset-backed securities [Member]
Assets:
Trading debt securities		0	0
Available-for-sale, at fair value		0	0
Liabilities:
Total short sale liabilities		0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Auto loans and leases [Member]
Assets:
Available-for-sale, at fair value		0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Home equity loans [Member]
Assets:
Available-for-sale, at fair value		0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other asset-backed securities [Member]
Assets:
Available-for-sale, at fair value		0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other debt securities [Member]
Assets:
Available-for-sale, at fair value		0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Equity securities [Member]
Liabilities:
Total short sale liabilities		(2,527)	(2,902)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Equity securities [Member] | Excluding NAV Investments [Member]
Assets:
Equity securities		28,447	23,205
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Marketable equity securities [Member] | Excluding NAV Investments [Member]
Assets:
Marketable equity securities		28,447	23,205
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Nonmarketable equity securities [Member] | Excluding NAV Investments [Member]
Assets:
Nonmarketable equity securities		0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other securities sold, not yet purchased [Member]
Liabilities:
Total short sale liabilities		0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Assets:
Mortgage loans held for sale		15,228	10,774
Loans held for sale		1,106	1,409
Loans		0	0
Mortgage servicing rights		0	0
Fair value asset derivatives, netting		0	0
Net amounts in consolidated balance sheet, assets		35,546	31,279
Liabilities:
Fair value liability derivatives, netting		0	0
Fair value liability derivatives, net		(34,237)	(28,973)
Total short sale liabilities		(5,660)	(4,968)
Other liabilities (2)		0	0
Total liabilities recorded at fair value		(39,897)	(33,941)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Excluding NAV Investments [Member]
Assets:
Total assets recorded at fair value		358,863	350,852
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest rate contract [Member]
Assets:
Derivative assets		25,258	18,294
Liabilities:
Total derivative liabilities		(20,537)	(16,217)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Commodity contract [Member]
Assets:
Derivative assets		1,404	1,535
Liabilities:
Total derivative liabilities		(1,887)	(2,287)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Equity contract [Member]
Assets:
Derivative assets		3,300	4,582
Liabilities:
Total derivative liabilities		(5,526)	(3,186)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign exchange contract [Member]
Assets:
Derivative assets		5,522	6,689
Liabilities:
Total derivative liabilities		(6,224)	(7,067)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Credit Risk Contract [Member]
Assets:
Derivative assets		62	179
Liabilities:
Total derivative liabilities		(63)	(216)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Debt securities [Member]
Assets:
Trading debt securities		54,891	49,174
Available-for-sale, at fair value		251,817	257,435
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Treasury and Government [Member]
Assets:
Trading debt securities		3,215	2,892
Available-for-sale, at fair value		2,995	2,949
Liabilities:
Total short sale liabilities		(230)	(411)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Securities of U.S. states and political subdivisions [Member]
Assets:
Trading debt securities		3,314	3,272
Available-for-sale, at fair value		44,704	48,820
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other trading debt securities [Member]
Assets:
Trading debt securities		13	6
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Mortgage-backed securities [Member]
Assets:
Trading debt securities		35,186	30,715
Available-for-sale, at fair value		161,260	160,162
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Federal agencies [Member]
Assets:
Available-for-sale, at fair value		155,858	153,203
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Residential [Member]
Assets:
Available-for-sale, at fair value		1,263	2,775
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Commercial [Member]
Assets:
Available-for-sale, at fair value		4,139	4,184
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Mortgage backed securities, other [Member]
Liabilities:
Total short sale liabilities		(533)	(47)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate debt securities [Member]
Assets:
Trading debt securities		11,321	10,723
Available-for-sale, at fair value		5,810	5,867
Liabilities:
Total short sale liabilities		(4,887)	(4,505)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Collateralized loan obligations [Member]
Assets:
Trading debt securities		758	673
Available-for-sale, at fair value		32,346	34,543
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Asset-backed securities [Member]
Assets:
Trading debt securities		1,084	893
Available-for-sale, at fair value		4,695	5,093
Liabilities:
Total short sale liabilities		(10)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Auto loans and leases [Member]
Assets:
Available-for-sale, at fair value		889	925
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Home equity loans [Member]
Assets:
Available-for-sale, at fair value		14	112
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other asset-backed securities [Member]
Assets:
Available-for-sale, at fair value		3,792	4,056
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other debt securities [Member]
Assets:
Available-for-sale, at fair value		7	1
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Equity securities [Member]
Liabilities:
Total short sale liabilities		0	(2)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Equity securities [Member] | Excluding NAV Investments [Member]
Assets:
Equity securities		275	781
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Marketable equity securities [Member] | Excluding NAV Investments [Member]
Assets:
Marketable equity securities		259	757
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Nonmarketable equity securities [Member] | Excluding NAV Investments [Member]
Assets:
Nonmarketable equity securities		16	24
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other securities sold, not yet purchased [Member]
Liabilities:
Total short sale liabilities		0	(3)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Assets:
Mortgage loans held for sale		1,115	997
Loans held for sale		12	60
Loans		202	244
Mortgage servicing rights		12,096	14,649
Fair value asset derivatives, netting		0	0
Net amounts in consolidated balance sheet, assets		2,285	1,570
Total assets recorded at fair value		24,900	25,300
Liabilities:
Fair value liability derivatives, netting		0	0
Fair value liability derivatives, net		(2,302)	(1,549)
Total short sale liabilities		0	0
Other liabilities (2)		(2)	(2)
Total liabilities recorded at fair value		(2,304)	(1,551)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Excluding NAV Investments [Member]
Assets:
Total assets recorded at fair value		24,932	25,322
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Interest rate contract [Member]
Assets:
Derivative assets		250	95
Liabilities:
Total derivative liabilities		(45)	(70)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Commodity contract [Member]
Assets:
Derivative assets		20	53
Liabilities:
Total derivative liabilities		(49)	(49)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Equity contract [Member]
Assets:
Derivative assets		1,915	1,315
Liabilities:
Total derivative liabilities		(2,143)	(1,332)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Foreign exchange contract [Member]
Assets:
Derivative assets		21	8
Liabilities:
Total derivative liabilities		(31)	(34)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Credit Risk Contract [Member]
Assets:
Derivative assets		79	99
Liabilities:
Total derivative liabilities		(34)	(64)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Debt securities [Member]
Assets:
Trading debt securities		307	290
Available-for-sale, at fair value		1,805	2,044
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | US Treasury and Government [Member]
Assets:
Trading debt securities		0	0
Available-for-sale, at fair value		0	0
Liabilities:
Total short sale liabilities		0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Securities of U.S. states and political subdivisions [Member]
Assets:
Trading debt securities		0	3
Available-for-sale, at fair value		391	444
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other trading debt securities [Member]
Assets:
Trading debt securities		14	16
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Mortgage-backed securities [Member]
Assets:
Trading debt securities		0	0
Available-for-sale, at fair value		41	41
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Federal agencies [Member]
Assets:
Available-for-sale, at fair value		0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Residential [Member]
Assets:
Available-for-sale, at fair value		0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Commercial [Member]
Assets:
Available-for-sale, at fair value		41	41
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Mortgage backed securities, other [Member]
Liabilities:
Total short sale liabilities		0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Corporate debt securities [Member]
Assets:
Trading debt securities		44	34
Available-for-sale, at fair value		383	370
Liabilities:
Total short sale liabilities		0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Collateralized loan obligations [Member]
Assets:
Trading debt securities		249	237
Available-for-sale, at fair value		649	800
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Collateralized debt obligations [Member]
Assets:
Available-for-sale, at fair value		649	800
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Asset-backed securities [Member]
Assets:
Trading debt securities		0	0
Available-for-sale, at fair value		341	389
Liabilities:
Total short sale liabilities		0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Auto loans and leases [Member]
Assets:
Available-for-sale, at fair value		0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Home equity loans [Member]
Assets:
Available-for-sale, at fair value		0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other asset-backed securities [Member]
Assets:
Available-for-sale, at fair value		341	389
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other debt securities [Member]
Assets:
Available-for-sale, at fair value		0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Equity securities [Member]
Liabilities:
Total short sale liabilities		0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Equity securities [Member] | Excluding NAV Investments [Member]
Assets:
Equity securities		7,110	5,468
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Marketable equity securities [Member] | Excluding NAV Investments [Member]
Assets:
Marketable equity securities		0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Nonmarketable equity securities [Member] | Excluding NAV Investments [Member]
Assets:
Nonmarketable equity securities		7,110	5,468
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other securities sold, not yet purchased [Member]
Liabilities:
Total short sale liabilities		0	0
Fair Value, Measurements, Recurring [Member] | Fair value measured at net asset value per share [Member] | Nonmarketable equity securities [Member] | Including NAV Investments [Member]
Assets:
Nonmarketable equity securities		$ 118	$ 102

[1] (1) Parenthetical amounts represent assets and liabilities that we are required to carry at fair value or have elected the fair value option.