Leases Operating Lease Income (Details) $ in Millions	3 Months Ended
Mar. 31, 2019 USD ($)
Operating Lease Income
Fixed Lease Income	$ 5
Variable Lease Income	4
Total Operating Lease Income	9
Power
Operating Lease Income
Fixed Lease Income	0
Variable Lease Income	4
Total Operating Lease Income	4
Energy Holdings \| Subsidiaries
Operating Lease Income
Fixed Lease Income	5
Variable Lease Income	0
Total Operating Lease Income	$ 5

Amount of contingent rental revenue recognized for the period under lease, based on the occurrences of an event or condition.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84164653&loc=d3e41551-112718

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- Definition

The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e39896-112707

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- Definition

The total amount of lease revenue recognized for the period for which the lessee was obligated under leasing arrangements regardless of any other events or conditions. This amount excludes contingent revenue and sublease revenue.

+ References

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