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Fair Value Measurements - Financial Instruments Not Recorded at Fair Value (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Mar. 31, 2024
Fair Value, Concentration of Risk, Financial Assets, Balance Sheet Groupings [Abstract]    
Total debt - third parties (excluding short term borrowings), fair value $ 4,676 $ 4,649
Total debt - third parties (excluding short term borrowings), carrying value 4,871 4,876
Other Assets, Fair Value Disclosure 2 3
Related Party    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Parties $ 2 $ 3