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Restructuring (Summary of Accrued Expenses Balance) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2024
Jan. 01, 2024
Restructuring Cost and Reserve [Line Items]          
Restructuring Reserve $ 42,000,000 $ 40,000,000 $ 39,000,000 $ 42,000,000 $ 59,000,000
Restructuring and Related Cost, Incurred Cost 46,000,000 57,000,000 44,000,000 146,000,000  
Payments for Restructuring (45,000,000) (56,000,000) (63,000,000)    
Restructuring Reserve, Accrual Adjustment 1,000,000 0 (1,000,000)    
Special Termination Benefits          
Restructuring Cost and Reserve [Line Items]          
Restructuring Reserve 17,000,000 21,000,000 27,000,000 17,000,000 41,000,000
Restructuring and Related Cost, Incurred Cost (1,000,000) (1,000,000) 0    
Payments for Restructuring (3,000,000) (5,000,000) (14,000,000)    
Restructuring Reserve, Accrual Adjustment 0 0 0    
Contract Termination          
Restructuring Cost and Reserve [Line Items]          
Restructuring Reserve 4,000,000 5,000,000 6,000,000 4,000,000 11,000,000
Restructuring and Related Cost, Incurred Cost 0 0 0    
Payments for Restructuring (1,000,000) (1,000,000) (5,000,000)    
Restructuring Reserve, Accrual Adjustment 0 0 0    
Other Restructuring          
Restructuring Cost and Reserve [Line Items]          
Restructuring Reserve 21,000,000 14,000,000 6,000,000 $ 21,000,000 $ 7,000,000
Restructuring and Related Cost, Incurred Cost 47,000,000 58,000,000 44,000,000    
Payments for Restructuring (41,000,000) (50,000,000) (44,000,000)    
Restructuring Reserve, Accrual Adjustment $ 1,000,000 $ 0 $ (1,000,000)