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Significant Financing Transactions (Schedule of Equity Units) (Parenthetical) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Jun. 14, 2019
Mar. 31, 2020
Dec. 31, 2019
Capital Unit [Line Items]      
Issuance costs $ 28    
Corporate units stock purchase contract liability payments   $ 20  
Stock Purchase Contract Liability   192 $ 212
Preferred Stock      
Capital Unit [Line Items]      
Issuance costs 14    
Recorded dividend   $ 7  
Dividends Payable, Amount Per Share   $ 4.375  
Common Stock      
Capital Unit [Line Items]      
Issuance costs $ 14