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Debt (Debt Exchange) (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Sep. 15, 2020
Debt Conversion [Line Items]      
Original debt     $ 1,047
New debt $ 1,047    
New rate 2.973%    
New due date Sep. 16, 2062    
Date of exchange   Sep. 16, 2020  
Cash consideration $ 319    
Accrued and unpaid interest 4 $ 4  
Debt exchange fees $ 9    
Minimum [Member]      
Debt Conversion [Line Items]      
Original due date     May 01, 2037
Maximum [Member]      
Debt Conversion [Line Items]      
Original due date     Mar. 01, 2049