Regulatory Requirements (Regulatory Capital and Ratios) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
CSC [Member]
Common Equity Tier 1 Risk-Based Capital
Actual Amount	$ 10,851
Minimum Capital Requirement	$ 2,681
Actual Ratio	18.20%
Minimum Capital Requirement Ratio	4.50%
Tier 1 Risk-Based Capital
Actual Amount	$ 12,310
Minimum Capital Requirement Amount	$ 3,575
Actual Ratio	20.70%
Minimum Capital Requirement Ratio	6.00%
Total Risk-Based Capital
Actual Amount	$ 12,342
Minimum Capital Requirement Amount	$ 4,766
Actual Ratio	20.70%
Minimum Capital Requirement Ratio	8.00%
Tier 1 Leverage
Actual Amount	$ 12,310
Minimum Capital Requirement Amount	$ 6,912
Actual Ratio	7.10%
Minimum Capital Requirement Ratio	4.00%
Schwab Bank [Member]
Common Equity Tier 1 Risk-Based Capital
Actual Amount	$ 9,314
Minimum to be Well Capitalized	3,349
Minimum Capital Requirement	$ 2,318
Actual Ratio	18.10%
Minimum to be Well Capitalized Ratio	6.50%
Minimum Capital Requirement Ratio	4.50%
Tier 1 Risk-Based Capital
Actual Amount	$ 9,314	$ 7,700
Minimum to be Well Capitalized Amount	4,121	2,095
Minimum Capital Requirement Amount	$ 3,091	$ 1,397
Actual Ratio	18.10%	22.10%
Minimum to be Well Capitalized Ratio	8.00%	6.00%
Minimum Capital Requirement Ratio	6.00%	4.00%
Total Risk-Based Capital
Actual Amount	$ 9,345	$ 7,744
Minimum to be Well Capitalized Amount	5,152	3,492
Minimum Capital Requirement Amount	$ 4,121	$ 2,793
Actual Ratio	18.10%	22.20%
Minimum to be Well Capitalized Ratio	10.00%	10.00%
Minimum Capital Requirement Ratio	8.00%	8.00%
Tier 1 Leverage
Actual Amount	$ 9,314	$ 7,700
Minimum to be Well Capitalized Amount	6,594	5,548
Minimum Capital Requirement Amount	$ 5,275	$ 4,438
Actual Ratio	7.10%	6.90%
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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