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Financial Instruments Owned and Pledged as Collateral at Fair Value, Securities Purchased Under Agreements to Resell and Securities Sold Under Agreements to Repurchase - Additional Information (Details)	9 Months Ended
	Sep. 30, 2018
Banking and Thrift [Abstract]
Securities Average Estimated Maturity Period (in years)	1 year 5 months
Confidence Level Value at Risk (as a percent)	98.00%
Value at Risk Threshold (as a percent)	0.10%

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- Definition

Confidence Level Value At Risk

+ References

No definition available.

+ Details

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- Definition

Securities average estimated maturity period.

+ References

No definition available.

+ Details

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- Definition

Value At Risk Threshold

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

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