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Restructuring (Summary of Accrued Expenses Balance) (Details) - USD ($)
3 Months Ended
Mar. 31, 2024
Jan. 01, 2024
Restructuring and Related Activities [Abstract]    
Restructuring Reserve $ 39,000,000 $ 59,000,000
Restructuring and Related Cost, Incurred Cost 44,000,000  
Payments for Restructuring (63,000,000)  
Restructuring Reserve, Accrual Adjustment (1,000,000)  
Restructuring Cost and Reserve [Line Items]    
Restructuring and Related Cost, Incurred Cost 44,000,000  
Payments for Restructuring 63,000,000  
Restructuring Reserve, Accrual Adjustment 1,000,000  
Restructuring Reserve 39,000,000 59,000,000
Contract Termination    
Restructuring and Related Activities [Abstract]    
Restructuring Reserve 6,000,000 11,000,000
Restructuring and Related Cost, Incurred Cost 0  
Payments for Restructuring (5,000,000)  
Restructuring Reserve, Accrual Adjustment 0  
Restructuring Cost and Reserve [Line Items]    
Restructuring and Related Cost, Incurred Cost 0  
Payments for Restructuring 5,000,000  
Restructuring Reserve, Accrual Adjustment 0  
Restructuring Reserve 6,000,000 11,000,000
Other Restructuring    
Restructuring and Related Activities [Abstract]    
Restructuring Reserve 6,000,000 7,000,000
Restructuring and Related Cost, Incurred Cost 44,000,000  
Payments for Restructuring (44,000,000)  
Restructuring Reserve, Accrual Adjustment (1,000,000)  
Restructuring Cost and Reserve [Line Items]    
Restructuring and Related Cost, Incurred Cost 44,000,000  
Payments for Restructuring 44,000,000  
Restructuring Reserve, Accrual Adjustment 1,000,000  
Restructuring Reserve 6,000,000 7,000,000
Special Termination Benefits    
Restructuring and Related Activities [Abstract]    
Restructuring Reserve 27,000,000 41,000,000
Restructuring and Related Cost, Incurred Cost 0  
Payments for Restructuring (14,000,000)  
Restructuring Reserve, Accrual Adjustment 0  
Restructuring Cost and Reserve [Line Items]    
Restructuring and Related Cost, Incurred Cost 0  
Payments for Restructuring 14,000,000  
Restructuring Reserve, Accrual Adjustment 0  
Restructuring Reserve $ 27,000,000 $ 41,000,000