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Significant Financing Transactions (Schedule of Equity Units) (Parenthetical) (Detail) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jun. 14, 2019 | Jun. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
Capital Unit [Line Items] |  |  |  |
Issuance costs | $ 28 |  |  |
Corporate units stock purchase contract liability payments |  |  | $ 41 |
Stock Purchase Contract Liability |  | $ 171 | 171 | $ 212
Preferred Stock |  |  |  |
Capital Unit [Line Items] |  |  |  |
Issuance costs | 14 |  |  |
Recorded dividend |  | $ 7 | $ 14 |
Preferred Stock | Second Quarter Dividend |  |  |  |
Capital Unit [Line Items] |  |  |  |
Dividends payable, amount per share |  | $ 4.375 | $ 4.375 |
Preferred Stock | First And Second Quarter Dividend |  |  |  |
Capital Unit [Line Items] |  |  |  |
Dividends payable, amount per share |  | $ 8.750 | $ 8.750 |
Common Stock |  |  |  |
Capital Unit [Line Items] |  |  |  |
Issuance costs | $ 14 |  |  |

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