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Reportable Segments and Revenue Recognition (Remaining Performance Obligation) (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Mar. 31, 2023
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, remaining performance obligation, amount $ 752 $ 821
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, remaining performance obligation, amount $ 127  
Revenue, remaining performance obligation, expected timing of satisfaction, period 9 months  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, remaining performance obligation, amount $ 168  
Revenue, remaining performance obligation, expected timing of satisfaction, period 1 year  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, remaining performance obligation, amount $ 143  
Revenue, remaining performance obligation, expected timing of satisfaction, period 1 year