Regulatory and Agency Capital Requirements (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Wells Fargo & Company [Member] | Advanced Approach Under Basel III [Member]
Regulatory capital:
Common equity tier 1	$ 148,855	$ 154,765
Tier 1	170,342	178,209
Total	201,616	210,333
Assets:
Risk-weighted	1,189,464	1,199,545
Adjusted average	$ 1,847,338	$ 1,905,568
Regulatory capital ratios:
Common equity tier 1 capital	12.51%	12.90%
Tier 1 capital	14.32%	14.86%
Total capital	16.95%	17.53%
Tier 1 leverage	9.22%	9.35%
Wells Fargo & Company [Member] | Standardized Approach Under Basel III [Member]
Regulatory capital:
Common equity tier 1	$ 148,855	$ 154,765
Tier 1	170,342	178,209
Total	209,924	220,097
Assets:
Risk-weighted	1,250,215	1,260,663
Adjusted average	$ 1,847,338	$ 1,905,568
Regulatory capital ratios:
Common equity tier 1 capital	11.91%	12.28%
Tier 1 capital	13.63%	14.14%
Total capital	16.79%	17.46%
Tier 1 leverage	9.22%	9.35%
Wells Fargo Bank, NA [Member] | Advanced Approach Under Basel III [Member]
Regulatory capital:
Common equity tier 1	$ 141,459	$ 143,292
Tier 1	141,459	143,292
Total	154,468	156,661
Assets:
Risk-weighted	1,082,515	1,090,360
Adjusted average	$ 1,647,541	$ 1,708,828
Regulatory capital ratios:
Common equity tier 1 capital	13.07%	13.14%
Tier 1 capital	13.07%	13.14%
Total capital	14.27%	14.37%
Tier 1 leverage	8.59%	8.39%
Wells Fargo Bank, NA [Member] | Standardized Approach Under Basel III [Member]
Regulatory capital:
Common equity tier 1	$ 141,459	$ 143,292
Tier 1	141,459	143,292
Total	162,353	165,734
Assets:
Risk-weighted	1,162,179	1,169,863
Adjusted average	$ 1,647,541	$ 1,708,828
Regulatory capital ratios:
Common equity tier 1 capital	12.17%	12.25%
Tier 1 capital	12.17%	12.25%
Total capital	13.97%	14.17%
Tier 1 leverage	8.59%	8.39%