Regulatory Requirements (Regulatory Capital and Ratios) (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
CSC [Member]
Common Equity Tier 1 Risk-Based Capital
Actual Amount	$ 13,094	$ 12,574
Actual Ratio	18.30%	18.40%
Minimum Capital Requirement	$ 3,212	$ 3,068
Minimum Capital Requirement Ratio	4.50%	4.50%
Tier 1 Risk-Based Capital
Actual Amount	$ 15,877	$ 15,357
Actual Ratio	22.20%	22.50%
Minimum Capital Requirement Amount	$ 4,283	$ 4,091
Minimum Capital Requirement Ratio	6.00%	6.00%
Total Risk-Based Capital
Actual Amount	$ 15,905	$ 15,384
Actual Ratio	22.30%	22.60%
Minimum Capital Requirement Amount	$ 5,710	$ 5,454
Minimum Capital Requirement Ratio	8.00%	8.00%
Tier 1 Leverage
Actual Amount	$ 15,877	$ 15,357
Actual Ratio	7.10%	7.20%
Minimum Capital Requirement Amount	$ 8,915	$ 8,516
Minimum Capital Requirement Ratio	4.00%	4.00%
Schwab Bank [Member]
Common Equity Tier 1 Risk-Based Capital
Actual Amount	$ 12,496	$ 11,878
Actual Ratio	19.70%	19.80%
Minimum to be Well Capitalized	$ 4,132	$ 3,894
Minimum to be Well Capitalized Ratio	6.50%	6.50%
Minimum Capital Requirement	$ 2,861	$ 2,696
Minimum Capital Requirement Ratio	4.50%	4.50%
Tier 1 Risk-Based Capital
Actual Amount	$ 12,496	$ 11,878
Actual Ratio	19.70%	19.80%
Minimum to be Well Capitalized Amount	$ 5,086	$ 4,793
Minimum to be Well Capitalized Ratio	8.00%	8.00%
Minimum Capital Requirement Amount	$ 3,814	$ 3,595
Minimum Capital Requirement Ratio	6.00%	6.00%
Total Risk-Based Capital
Actual Amount	$ 12,522	$ 11,904
Actual Ratio	19.70%	19.90%
Minimum to be Well Capitalized Amount	$ 6,357	$ 5,992
Minimum to be Well Capitalized Ratio	10.00%	10.00%
Minimum Capital Requirement Amount	$ 5,086	$ 4,793
Minimum Capital Requirement Ratio	8.00%	8.00%
Tier 1 Leverage
Actual Amount	$ 12,496	$ 11,878
Actual Ratio	7.00%	7.00%
Minimum to be Well Capitalized Amount	$ 8,912	$ 8,456
Minimum to be Well Capitalized Ratio	5.00%	5.00%
Minimum Capital Requirement Amount	$ 7,130	$ 6,765
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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-Name Accounting Standards Codification
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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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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