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Significant Financing Transactions (Schedule of Equity Units) (Parenthetical) (Details) - USD ($) $ in Millions | Jun. 14, 2019 | Sep. 30, 2019
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Capital Unit [Line Items] |  |
Issuance costs | $ 28 |
Corporate units stock purchase contract liability payments | 17 |
Stock Purchase Contract Liability |  | $ 233
Preferred Stock |  |
Capital Unit [Line Items] |  |
Issuance costs | 14 |
Common Stock |  |
Capital Unit [Line Items] |  |
Issuance costs | $ 14 |

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- Definition The cash outflow for cost incurred directly with the issuance of an equity security. + References 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 + Details
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