Condensed Consolidated Statements of Changes in Equity (Parenthetical) $ in Millions	9 Months Ended
Sep. 30, 2017 USD ($)
Progress Energy [Member]
Dividend to parent related to a legal entity restructuring	$ 547

Amount of paid and unpaid common stock dividends declared with the form of settlement in payment-in-kind (PIK).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration