Consolidated Statements of Equity (Parentheticals) $ in Millions	12 Months Ended
Dec. 31, 2017 USD ($)
Progress Energy [Member]
Non-cash dividend	$ 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

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