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Debt (Narrative) (Details) - Line of Credit [Member] $ in Billions	6 Months Ended
	Jun. 30, 2021 USD ($)
Debt Instrument [Line Items]
Current borrowing capacity	$ 2.5
Minimum consolidated net worth	$ 10.0
Percentage of aggregate net proceeds of equity issuances	50.00%
Debt to capital ratio (low end of range)	0.35%
Debt to capital ratio (high end of range)	1.00%
Non-operating indebtedness of subsidiaries to total capitalization, maximum	7.50%

X

- Definition

Non-operating indebtedness of subsidiaries to total capitalization, maximum

+ References

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- Definition

Percentage of aggregate net proceeds of equity issuances received by the entity that is added to the specified level of net worth in calculating total minimum net worth to be maintained in accordance with the terms of the credit facility.

+ References

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- Definition

Total Aggregate Indebtedness divided by Net Capital, high end of range.

+ References

No definition available.

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- Definition

Total Aggregate Indebtedness divided by Net Capital, low end of range.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

The lowest amount of net worth (total assets minus total liabilities) required by secondary market investors or state-imposed regulatory mandates.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47304-110998

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)(a)
-URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47080-110998

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