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Significant Financing Transactions (Schedule of Equity Units) (Parenthetical) (Detail) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jun. 14, 2019 | Sep. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Capital Unit [Line Items] |  |  |  |  |
Issuance costs | $ 28 |  |  |  |
Corporate units stock purchase contract liability payments |  |  | $ 62 | $ 17 |
Stock Purchase Contract Liability |  | $ 150 | 150 |  | $ 212
Preferred Stock |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |
Issuance costs | 14 |  |  |  |
Recorded dividend |  | $ 7 | $ 21 |  |
Recorded dividends per share |  | $ 4.375 | $ 13.125 |  |
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=121586364&loc=d3e3291-108585 + Details
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