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Preferred Stock (Schedule of Equity Units) (Parenthetical) (Detail) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Capital Unit [Line Items] |  |
Issuance costs |  | $ 28
Corporate units stock purchase contract liability payments | $ 83 | 38
Stock Purchase Contract Liability | 129 | 212
Preferred Stock |  |
Capital Unit [Line Items] |  |
Issuance costs |  | 14
Recorded dividend | $ 28 | $ 15
Dividends per share | $ 17.50 | $ 9.479
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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