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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