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Regulatory Requirements (Narrative) (Details) $ in Millions	Dec. 31, 2019 USD ($)
Regulatory Requirements [Abstract]
Excess regulatory capital	$ 6,363

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- References

No definition available.

+ Details

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Namespace Prefix:	srt_
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- Definition

The amount by which the company's Total Capital exceeds the minimum required for capital adequacy purposes.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826

+ Details

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