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Preferred Stock (Schedule of Equity Units) (Parenthetical) (Detail) - USD ($) $ / shares in Units, $ in Millions |  | 12 Months Ended
--- | --- | ---
Jun. 14, 2019 | Dec. 31, 2019
Capital Unit [Line Items] |  |
Issuance costs | $ 28 |
Corporate units stock purchase contract liability payments |  | $ 38
Stock Purchase Contract Liability |  | 212
Preferred Stock |  |
Capital Unit [Line Items] |  |
Issuance costs | 14 |
Recorded dividend |  | $ 15
Dividends per share |  | $ 9.479
Common Stock [Member] |  |
Capital Unit [Line Items] |  |
Issuance costs | $ 14 |

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