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Stockholders' Equity (Components of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Unrealized currency translation adjustments $ (149) $ 93    
Net current period other comprehensive income (loss) (11) 8    
Total Other Comprehensive Income (Loss), Net of Tax (75) 7    
Accumulated Other Comprehensive Income (loss) (3,655)   $ (3,582)  
Defined Benefit Pension Plans        
Defined benefit and other postretirement benefit plans - Beginning balance (791) (789)    
Other comprehensive income/(loss) before reclassifications (3) 14    
(Income)/loss reclassified from AOCI [1] 8 7    
Net current period other comprehensive income (loss) (11) 7    
Defined benefit and other postretirement benefit plans - Ending balance (780) (796)    
Other Postretirement Benefit Plans        
Defined benefit and other postretirement benefit plans - Beginning balance 39 52    
Other comprehensive income/(loss) before reclassifications 1 0    
(Income)/loss reclassified from AOCI [1] (1) (1)    
Net current period other comprehensive income (loss) 0 1    
Defined benefit and other postretirement benefit plans - Ending balance 39 51    
Unrealized Translation        
Unrealized translation - Beginning balance (2,678) (2,769)    
Other comprehensive income/(loss) before reclassifications (144) 95    
(Income)/loss reclassified from AOCI 0 0    
Unrealized currency translation adjustments (144) 95    
Unrealized translation - Ending balance (2,822) (2,674)    
Cash Flow Hedges and Other        
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 60 (93)    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0 15    
Total Other Comprehensive Income (Loss), Net of Tax 60 (78)    
Accumulated Other Comprehensive Income (loss) $ (92) $ (241) $ (152) $ (163)
[1] Included in computation of net periodic benefit costs.