Regulatory and Agency Capital Requirements (Details) $ in Millions	9 Months Ended	12 Months Ended	21 Months Ended
	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2021 USD ($)
Wells Fargo & Company [Member]
Regulatory leverage:
Total leverage exposure	$ 2,313,634	$ 1,963,971	$ 2,313,634
Supplementary leverage ratio (SLR)	0.0694	0.0805	0.0694
Tier 1 leverage ratio	0.0836	0.0832	0.0836
Increase in capital due to the impact of the CECL transition provision			$ 463
Post-tax increase in capital recognized under initial adoption of CECL	$ 991		991
Increase in ACL under CECL			5,800
Wells Fargo & Company [Member] | Advanced Approach Under Basel III [Member]
Regulatory capital:
Common Equity Tier 1	141,585	$ 138,297	141,585
Tier 1	160,615	158,196	160,615
Total	187,442	186,934	187,442
Assets:
Risk-weighted assets	1,138,635	1,158,355	$ 1,138,635
Adjusted average assets	$ 1,921,350	$ 1,900,258
Regulatory capital ratios:
Common Equity Tier 1 capital	0.1243	0.1194	0.1243
Tier 1 capital	0.1411	0.1366	0.1411
Total capital	0.1646	0.1614	0.1646
Regulatory leverage:
Increased RWAs related to the impact of the CECL transition provision	$ (1,400)		$ (1,400)
Wells Fargo & Company [Member] | Standardized Approach Under Basel III [Member]
Regulatory capital:
Common Equity Tier 1	141,585	$ 138,297	141,585
Tier 1	160,615	158,196	160,615
Total	197,639	196,660	197,639
Assets:
Risk-weighted assets	1,218,911	1,193,744	$ 1,218,911
Adjusted average assets	$ 1,921,350	$ 1,900,258
Regulatory capital ratios:
Common Equity Tier 1 capital	0.1162	0.1159	0.1162
Tier 1 capital	0.1318	0.1325	0.1318
Total capital	0.1621	0.1647	0.1621
Regulatory leverage:
Increased RWAs related to the impact of the CECL transition provision	$ 132		$ 132
Wells Fargo Bank, NA [Member]
Regulatory leverage:
Total leverage exposure	$ 2,126,015	$ 2,041,952	$ 2,126,015
Supplementary leverage ratio (SLR)	0.0706	0.0735	0.0706
Tier 1 leverage ratio	0.0853	0.0865	0.0853
Increase in capital due to the impact of the CECL transition provision			$ 463
Wells Fargo Bank, NA [Member] | Advanced Approach Under Basel III [Member]
Regulatory capital:
Common Equity Tier 1	$ 150,046	$ 150,168	150,046
Tier 1	150,046	150,168	150,046
Total	163,907	164,412	163,907
Assets:
Risk-weighted assets	995,699	1,012,751	$ 995,699
Adjusted average assets	$ 1,758,333	$ 1,735,406
Regulatory capital ratios:
Common Equity Tier 1 capital	0.1507	0.1483	0.1507
Tier 1 capital	0.1507	0.1483	0.1507
Total capital	0.1646	0.1623	0.1646
Regulatory leverage:
Increased RWAs related to the impact of the CECL transition provision	$ (1,400)		$ (1,400)
Wells Fargo Bank, NA [Member] | Standardized Approach Under Basel III [Member]
Regulatory capital:
Common Equity Tier 1	150,046	$ 150,168	150,046
Tier 1	150,046	150,168	150,046
Total	173,608	173,719	173,608
Assets:
Risk-weighted assets	1,117,279	1,085,599	$ 1,117,279
Adjusted average assets	$ 1,758,333	$ 1,735,406
Regulatory capital ratios:
Common Equity Tier 1 capital	0.1343	0.1383	0.1343
Tier 1 capital	0.1343	0.1383	0.1343
Total capital	0.1554	0.1600	0.1554
Regulatory leverage:
Increased RWAs related to the impact of the CECL transition provision	$ 132		$ 132