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Summary Of Significant Accounting Policies (Summary Of Changes In Accumulated Balances Of Other Comprehensive Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Beginning Balance $ 1,589 $ (30) $ 1,531 $ 1,652
Net change in accumulated other comprehensive income (loss), net of income tax (103) 60 26 22
Ending Balance 1,580 81 1,580 81
Unrealized Gains (Losses) On Hedging Activities, Net [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Beginning balance, before tax     8  
Other comprehensive income (loss) before reclassifications, before tax     (24)  
Amount of (gains) loss reclassified from accumulated other comprehensive income (loss), before tax     9  
Net current period other comprehensive income (loss), before tax     (15)  
Ending balance, before tax (7)   (7)  
Foreign Currency Translation [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Beginning balance, before tax     (523)  
Other comprehensive income (loss) before reclassifications, before tax     38  
Net current period other comprehensive income (loss), before tax     38  
Ending balance, before tax (485)   (485)  
Accumulated Other Comprehensive Loss [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other comprehensive income (loss) before reclassifications, Estimated tax benefit (expense)     5  
Amount of (gains) loss reclassified from accumulated other comprehensive income (loss), Estimated tax benefit (expense)     (2)  
Net current period other comprehensive income (loss), Estimated tax benefit (expense)     3  
Ending balance, Estimated tax benefit (expense) 3   3  
Beginning Balance (386) (506) (515) (468)
Other comprehensive income (loss) before reclassifications, net tax     19  
Amount of (gains) loss reclassified from accumulated other comprehensive income (loss), net of tax     7  
Net change in accumulated other comprehensive income (loss), net of income tax     26  
Ending Balance $ (489) $ (446) $ (489) $ (446)