Significant Financing Transactions (Schedule of Equity Units) (Parenthetical) (Details) $ in Millions	Jun. 14, 2019 USD ($)
Capital Unit [Line Items]
Issuance costs	$ 28
Preferred Stock
Capital Unit [Line Items]
Issuance costs	14
Common Stock
Capital Unit [Line Items]
Issuance costs	$ 14

The cash outflow for cost incurred directly with the issuance of an equity security.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585

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