Regulatory Requirements (Regulatory Capital and Ratios) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
CSC [Member]
Common Equity Tier 1 Risk-Based Capital
Actual Amount	$ 12,574	$ 10,851
Minimum Capital Requirement	$ 3,068	$ 2,681
Actual Ratio	18.40%	18.20%
Minimum Capital Requirement Ratio	4.50%	4.50%
Tier 1 Risk-Based Capital
Actual Amount	$ 15,357	$ 12,310
Minimum Capital Requirement Amount	$ 4,091	$ 3,575
Actual Ratio	22.50%	20.70%
Minimum Capital Requirement Ratio	6.00%	6.00%
Total Risk-Based Capital
Actual Amount	$ 15,384	$ 12,342
Minimum Capital Requirement Amount	$ 5,454	$ 4,766
Actual Ratio	22.60%	20.70%
Minimum Capital Requirement Ratio	8.00%	8.00%
Tier 1 Leverage
Actual Amount	$ 15,357	$ 12,310
Minimum Capital Requirement Amount	$ 8,516	$ 6,912
Actual Ratio	7.20%	7.10%
Minimum Capital Requirement Ratio	4.00%	4.00%
Schwab Bank [Member]
Common Equity Tier 1 Risk-Based Capital
Actual Amount	$ 11,878	$ 9,314
Minimum to be Well Capitalized	3,894	3,349
Minimum Capital Requirement	$ 2,696	$ 2,318
Actual Ratio	19.80%	18.10%
Minimum to be Well Capitalized Ratio	6.50%	6.50%
Minimum Capital Requirement Ratio	4.50%	4.50%
Tier 1 Risk-Based Capital
Actual Amount	$ 11,878	$ 9,314
Minimum to be Well Capitalized Amount	4,793	4,121
Minimum Capital Requirement Amount	$ 3,595	$ 3,091
Actual Ratio	19.80%	18.10%
Minimum to be Well Capitalized Ratio	8.00%	8.00%
Minimum Capital Requirement Ratio	6.00%	6.00%
Total Risk-Based Capital
Actual Amount	$ 11,904	$ 9,345
Minimum to be Well Capitalized Amount	5,992	5,152
Minimum Capital Requirement Amount	$ 4,793	$ 4,121
Actual Ratio	19.90%	18.10%
Minimum to be Well Capitalized Ratio	10.00%	10.00%
Minimum Capital Requirement Ratio	8.00%	8.00%
Tier 1 Leverage
Actual Amount	$ 11,878	$ 9,314
Minimum to be Well Capitalized Amount	8,456	6,594
Minimum Capital Requirement Amount	$ 6,765	$ 5,275
Actual Ratio	7.00%	7.10%
Minimum to be Well Capitalized Ratio	5.00%	5.00%
Minimum Capital Requirement Ratio	4.00%	4.00%

Common Equity Tier 1 Risk Based Capital as defined in the regulations.

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Common Equity Tier One Risk-Based Capital [Abstract]

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The minimum amount of Common Equity Tier 1 Risk Based Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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The minimum Common Equity 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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The amount of Common Equity Tier 1 Risk Based Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action.

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The Common Equity Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action.

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Common Equity Tier 1 capital divided by risk weighted assets as defined by regulations.

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The amount of total capital as defined in the regulations.

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The minimum amount of Total Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The amount of Total Capital required to be categorized as well as capitalized under the regulatory framework for prompt corrective action.

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The Total risk based capital ratio (total capital divided by risk weighted assets) required to be categorized as "well capitalized", in the regulatory framework for prompt corrective action.

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Total Capital divided by risk weighted assets as defined in the regulations.

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Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital.

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The minimum amount of Tier 1 Leverage Capital 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 amount of Tier 1 Leverage Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action.

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The amount of Tier 1 Leverage Capital required to be categorized as well capitalized divided by average assets as defined in the regulatory framework for prompt corrective action.

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Tier 1 Leverage Capital divided by average assets as defined in the regulations.

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Tier 1 Risk Based Capital as defined in the regulations.

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The minimum amount of Tier 1 Risk Based Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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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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The amount of Tier 1 Risk Based Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action.

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The Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action.

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Tier 1 capital divided by risk weighted assets as defined by regulations.

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