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Debt (Narrative) (Details) - USD ($)
3 Months Ended
Dec. 31, 2022
Oct. 01, 2022
Debt Instrument [Line Items]    
Document Period End Date Dec. 31, 2022  
Debt Instrument, Unamortized Discount $ 38,000,000 $ 39,000,000
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Maximum borrowing capacity 2,250,000,000  
Amount available for borrowing under credit facility 2,250,000,000  
Revolving credit facility 0 0
Standby Letters of Credit [Member]    
Debt Instrument [Line Items]    
Letters of Credit Outstanding, Amount 0  
Bilateral Letters Of Credit [Member]    
Debt Instrument [Line Items]    
Letters of Credit Outstanding, Amount 103,000,000  
Commercial paper    
Debt Instrument [Line Items]    
Maximum borrowing capacity 1,500,000,000  
Commercial paper $ 0 $ 0