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Comprehensive Income (Loss) (Summary Of The Activity In AOCI, Net Of The Related Tax Effects) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance at the beginning of period $ (21) $ (9)
Other comprehensive income (loss) before reclassifications:    
Pre-tax amount (26) (22)
Tax provision (benefit) (6) (5)
After-tax amount (20) (17)
Amounts reclassified from accumulated other comprehensive income (loss) [1] 5 1
Net current period other comprehensive income (loss) (15) (15)
Balance at the end of period (36) (25)
Unrealized Losses On Derivatives [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance at the beginning of period (21) (9)
Other comprehensive income (loss) before reclassifications:    
Pre-tax amount (26) (22)
Tax provision (benefit) (6) (5)
After-tax amount (20) (17)
Amounts reclassified from accumulated other comprehensive income (loss) [1] 5 1
Net current period other comprehensive income (loss) (15) (16)
Balance at the end of period (36) $ (25)
Unrealized Gains (Loss) On Available-for-Sale Securities [Member]    
Other comprehensive income (loss) before reclassifications:    
Amounts reclassified from accumulated other comprehensive income (loss) [1]  
[1] Amounts are net of tax. See reclassifications out of AOCI below for further details.