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Income Taxes - Narrative (Details)
$ in Millions
 3 Months Ended
Jun. 30, 2025
USD ($)
issue
Jun. 30, 2024
Apr. 01, 2017
USD ($)
Income Tax Contingency [Line Items]      
Effective income tax rate 73.10% 63.20%  
Deferred tax liability, undistributed foreign earnings $ 28    
Number of tax examination primary issues | issue 3    
Income tax examination, estimate of possible loss $ 552    
Potential cash tax payments 632    
Interest deduction tax benefit 74    
Increase in liability for uncertain tax positions 2    
Income Tax Examination, Issue One      
Income Tax Contingency [Line Items]      
Tax examination disputed amount 651    
Income tax examination, estimate of possible loss 477    
Income Tax Examination, Issue Two      
Income Tax Contingency [Line Items]      
Tax examination disputed amount 146    
Income tax examination, estimate of possible loss 103    
Income Tax Examination, Issue Three      
Income Tax Contingency [Line Items]      
Tax examination disputed amount 165    
Income tax examination, estimate of possible loss $ 126    
Tax examination period 8 years    
Discontinued Operations | USPS Separation      
Income Tax Contingency [Line Items]      
Tax indemnification receivable related to disposal $ 13    
Tax indemnification payable related to disposal $ 1    
HPES      
Income Tax Contingency [Line Items]      
Tax indemnification receivable, uncertain tax positions     $ 13
Tax indemnification receivable, tax indemnification payable     38
Tax indemnification payable related to other tax receivables     $ 95