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Major Accounting Policies - Research and Development (Details) - Nu Scale Power - Cost-sharing agreement, research and development activities $ in Millions	1 Months Ended
	May 31, 2014 USD ($)
Research and Development
Recovery of Direct Costs	$ 217
Cost reimbursement (as a percent)	43.00%

X

- Definition

Represents the amount of cost reimbursed, as a percentage of qualified expenses.

+ References

No definition available.

+ Details

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- Definition

Return of or reimbursements received in relation to direct costs and expenses previously paid or incurred.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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- References

No definition available.

+ Details

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- Details

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