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Comprehensive Income (Loss) (Summary Of The Activity In Other Comprehensive Income (Loss), Net Of The Related Tax Effects) (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance at the beginning of period $ (9) $ 0
Other comprehensive income (loss) before reclassifications:    
Pre-tax amount (22)  
Tax provision (benefit) (5)  
After-tax amount (17)  
Amounts reclassified from accumulated other comprehensive income (loss) [1] 1  
Net current period other comprehensive income (loss) (15) 0
Balance at the end of period (25) 0
Unrealized Loss on Derivatives [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance at the beginning of period (9) 0
Other comprehensive income (loss) before reclassifications:    
Pre-tax amount (22)  
Tax provision (benefit) (5)  
After-tax amount (17)  
Amounts reclassified from accumulated other comprehensive income (loss) [1] 1  
Net current period other comprehensive income (loss) (16) 0
Balance at the end of period (25) 0
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance at the beginning of period 0 0
Other comprehensive income (loss) before reclassifications:    
Pre-tax amount 0  
Tax provision (benefit) 0  
After-tax amount 0  
Amounts reclassified from accumulated other comprehensive income (loss) [1]  
Net current period other comprehensive income (loss) 0 0
Balance at the end of period $ 0 $ 0
[1] Amounts are net of tax. See reclassifications out of AOCI below for further details.