Securitizations and Variable Interest Entities, Balance Sheet Transactions with VIEs (Details) - USD ($) $ in Millions		Sep. 30, 2018	Dec. 31, 2017
Variable Interest Entity Consolidated Carrying Amount Assets and Liabilities
Cash		$ 18,791	$ 23,367
Interest-earning deposits with banks (1)		140,732	192,580	[1]
Debt securities:
Trading debt securities		65,188	57,624	[2]
Available-for-sale debt securities		262,964	276,407	[2]
Held-to-maturity, at cost (fair value $139,036 and $138,985)		144,131	139,335
Mortgages held for sale	[3]	19,225	20,070
Loans	[3]	942,300	956,770
Mortgage servicing rights		15,980	13,625
Derivative assets		11,811	12,228
Equity investments		61,755	62,497	[2]
Other assets		78,248	90,244	[2]
Total assets	[4]	1,872,981	1,951,757
Short-term borrowings		105,451	103,256
Derivative liabilities		8,586	8,796
Accrued expenses and other liabilities		71,348	70,615
Long-term debt		221,323	225,020
Total liabilities	[5]	1,673,302	1,743,678
Noncontrolling interests		938	1,143
VIEs that we consolidate recourse [member]
Debt securities:
Total liabilities		0	0
VIEs that we do not consolidate [Member]
Variable Interest Entity Consolidated Carrying Amount Assets and Liabilities
Cash		0	0
Interest-earning deposits with banks (1)		0	0
Debt securities:
Trading debt securities		1,973	1,305
Available-for-sale debt securities		2,806	3,288
Held-to-maturity, at cost (fair value $139,036 and $138,985)		499	485
Loans		1,504	4,274
Mortgage servicing rights		15,930	13,628
Derivative assets		43	44
Equity investments		10,572	10,740
Other assets		0	0
Total assets		33,327	33,764
Short-term borrowings		0	0
Derivative liabilities		92	106
Accrued expenses and other liabilities		242	244
Long-term debt		3,428	3,590
Total liabilities		3,762	3,940
Noncontrolling interests		0	0
Net assets		29,565	29,824
VIEs that we consolidate [Member]
Variable Interest Entity Consolidated Carrying Amount Assets and Liabilities
Cash		112	116
Interest-earning deposits with banks (1)		8	371
Debt securities:
Trading debt securities		0	0
Available-for-sale debt securities		0	0
Held-to-maturity, at cost (fair value $139,036 and $138,985)		0	0
Loans		12,749	12,482
Mortgage servicing rights		0	0
Derivative assets		0	0
Equity investments		61	306
Other assets		210	342
Total assets		13,140	13,617
Short-term borrowings		0	0
Derivative liabilities		0	5
Accrued expenses and other liabilities		154	132
Long-term debt		871	1,479
Total liabilities		1,025	1,616
Noncontrolling interests		37	283
Net assets		12,078	11,718
Transfers that we account for as secured borrowings [Member]
Variable Interest Entity Consolidated Carrying Amount Assets and Liabilities
Cash		0	0
Interest-earning deposits with banks (1)		0	0
Debt securities:
Trading debt securities		200	201
Available-for-sale debt securities		338	358
Held-to-maturity, at cost (fair value $139,036 and $138,985)		0	0
Loans		96	110
Mortgage servicing rights		0	0
Derivative assets		0	0
Equity investments		0	0
Other assets		7	6
Total assets		641	675
Short-term borrowings		512	522
Derivative liabilities		0	0
Accrued expenses and other liabilities		9	10
Long-term debt		97	111
Total liabilities		618	643
Noncontrolling interests		0	0
Net assets		23	32
Total VIE [Member]
Variable Interest Entity Consolidated Carrying Amount Assets and Liabilities
Cash		112	116
Interest-earning deposits with banks (1)		8	371
Debt securities:
Trading debt securities		2,173	1,506
Available-for-sale debt securities		3,144	3,646
Held-to-maturity, at cost (fair value $139,036 and $138,985)		499	485
Loans		14,349	16,866
Mortgage servicing rights		15,930	13,628
Derivative assets		43	44
Equity investments		10,633	11,046
Other assets		217	348
Total assets		47,108	48,056
Short-term borrowings		512	522
Derivative liabilities		92	111
Accrued expenses and other liabilities		405	386
Long-term debt		4,396	5,180
Total liabilities		5,405	6,199
Noncontrolling interests		37	283
Net assets		$ 41,666	$ 41,574

[1] (1)Financial information has been revised to reflect the impact of the adoption in first quarter 2018 of ASU 2016-18 – Statement of Cash Flows (Topic 230): Restricted Cash in which we changed the presentation of our cash and cash equivalents to include both cash and due from banks as well as interest-earning deposits with banks, which are inclusive of any restricted cash. See Note 1 (Summary of Significant Accounting Policies) for more information.

[2] (2)Financial information for the prior period has been revised to reflect the impact of the adoption in first quarter 2018 of ASU 2016-01 – Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. See Note 1 (Summary of Significant Accounting Policies) for more information.

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

[4] (4)Our consolidated assets at September 30, 2018, and December 31, 2017, include the following assets of certain variable interest entities (VIEs) that can only be used to settle the liabilities of those VIEs: Cash and due from banks, $112 million and $116 million; Interest-earning deposits with banks, $8 million and $371 million; Debt securities, $0 million at both period ends; Net loans, $12.7 billion and $12.5 billion; Derivative assets, $0 million at both period ends; Equity securities, $61 million and $306 million; Other assets, $210 million and $342 million; and Total assets, $13.1 billion and $13.6 billion, respectively.

[5] (5)Our consolidated liabilities at September 30, 2018, and December 31, 2017, include the following VIE liabilities for which the VIE creditors do not have recourse to Wells Fargo: Derivative liabilities, $0 million and $5 million; Accrued expenses and other liabilities, $154 million and $132 million; Long-term debt, $871 million and $1.5 billion; and Total liabilities, $1.0 billion and $1.6 billion, respectively.