Regulatory and Agency Capital Requirements Minimum Required Regulatory Capital Ratios – Transition Requirements (Details)	Jun. 30, 2019	Dec. 31, 2018
Parent Company [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier One Risk Based Common Equity Required for Capital Adequacy to Risk Weighted Assets	9.00%	7.875%
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	10.50%	9.375%
Capital Required for Capital Adequacy to Risk Weighted Assets	12.50%	11.375%
Tier One Leverage Capital Required for Capital Adequacy to Average Assets	4.00%	4.00%
Enhanced Supplementary Leverage Capital Required Ratio	5.00%	5.00%
Capital Conservation Buffer	2.50%
GSIB Surcharge	2.00%
Wells Fargo Bank, NA [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier One Risk Based Common Equity Required for Capital Adequacy to Risk Weighted Assets	7.00%	6.375%
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	8.50%	7.875%
Capital Required for Capital Adequacy to Risk Weighted Assets	10.50%	9.875%
Tier One Leverage Capital Required for Capital Adequacy to Average Assets	4.00%	4.00%
Enhanced Supplementary Leverage Capital Required Ratio	6.00%	6.00%
Capital Conservation Buffer	2.50%

The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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The minimum amount of Tier 1 Leverage Capital for capital adequacy purposes divided by average assets as defined in the regulations.

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The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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Capital Conservation Buffer

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GSIB Surcharge

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The minimum amount of Tier 1 enhanced supplemental Leverage Capital for well capitalized purposes divided by leverage exposure as defined in the regulations.

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The minimum Tier One Common Equity Ratio (Tier one common equity divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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