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Accumulated Other Comprehensive Loss (AOCL) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Accumulated Other Comprehensive Income Loss [Line Items]        
Accumulated other comprehensive loss $ (2,251)   $ (2,239)  
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax (15) $ 253    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 3 149    
Tax cost related to unrealized currency translation adjustments other than translation of foreign denominated balance sheets 68 64    
Pension and other postretirement benefit adjustments, tax cost 1 46    
Accumulated Translation Adjustment [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Accumulated other comprehensive loss (1,758) (1,991) (1,746) $ (2,254)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax (12) 262    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0 1    
Accumulated Defined Benefit Plans Adjustment [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Accumulated other comprehensive loss (494) (418) (494) (557)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax (3) (9)    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 3 148    
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest        
Accumulated Other Comprehensive Income Loss [Line Items]        
Accumulated other comprehensive loss 1 1 1 1
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax 0 0    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0 0    
Accumulated Other Comprehensive Loss        
Accumulated Other Comprehensive Income Loss [Line Items]        
Accumulated other comprehensive loss $ (2,251) $ (2,408) $ (2,239) $ (2,810)