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Debt - Schedule of Debt (Details)
$ in Millions
Sep. 30, 2022
USD ($)
Sep. 30, 2022
EUR (€)
Mar. 31, 2022
USD ($)
Short-term debt and current maturities of long-term debt      
Commercial paper $ 367   $ 362
Current maturities of long-term debt 232   249
Current maturities of finance lease liabilities 235   289
Short-term debt and current maturities of long-term debt 834   900
Long-term debt, net of current maturities      
Finance lease liabilities 529   643
Long-term debt 4,162   4,603
Less: current maturities 467   538
Long-term debt, net of current maturities $ 3,695   4,065
Minimum      
Debt Information [Abstract]      
Effective interest rate 0.34% 0.34%  
Maximum      
Debt Information [Abstract]      
Effective interest rate 14.01% 14.01%  
Senior notes      
Long-term debt, net of current maturities      
Long-term debt, net of current maturities $ 3,309   3,575
Unamortized debt (discount) premiums and deferred debt issuance costs $ (22)   (28)
Senior notes | Senior Notes Due 2026      
Debt Information [Abstract]      
Face amount | €   € 650,000,000  
Effective interest rate 1.75% 1.75%  
Long-term debt, net of current maturities      
Long-term debt, net of current maturities $ 635   720
Senior notes | Senior Notes Due 2027      
Debt Information [Abstract]      
Face amount $ 700    
Effective interest rate 1.80% 1.80%  
Long-term debt, net of current maturities      
Long-term debt, net of current maturities $ 695   694
Senior notes | Senior Notes Due 2028      
Debt Information [Abstract]      
Face amount | €   € 750,000,000  
Effective interest rate 0.45% 0.45%  
Long-term debt, net of current maturities      
Long-term debt, net of current maturities $ 730   828
Senior notes | Senior Notes Due 2029      
Debt Information [Abstract]      
Face amount $ 650    
Effective interest rate 2.375% 2.375%  
Long-term debt, net of current maturities      
Long-term debt, net of current maturities $ 645   644
Senior notes | Senior Notes Due 2032      
Debt Information [Abstract]      
Face amount | €   € 600,000,000  
Effective interest rate 0.95% 0.95%  
Long-term debt, net of current maturities      
Long-term debt, net of current maturities $ 582   661
Borrowings for assets acquired under long-term financing      
Long-term debt, net of current maturities      
Long-term debt, net of current maturities $ 280   344
Borrowings for assets acquired under long-term financing | Minimum      
Debt Information [Abstract]      
Effective interest rate 0.00% 0.00%  
Borrowings for assets acquired under long-term financing | Maximum      
Debt Information [Abstract]      
Effective interest rate 6.78% 6.78%  
Mandatorily redeemable preferred stock outstanding      
Debt Information [Abstract]      
Effective interest rate 6.00% 6.00%  
Long-term debt, net of current maturities      
Long-term debt, net of current maturities $ 63   63
Other borrowings      
Long-term debt, net of current maturities      
Long-term debt, net of current maturities $ 3   $ 6
Commercial paper      
Long-term debt, net of current maturities      
Amount of multi-year committed revolving credit facility | €   € 1,000,000,000  
Commercial paper | Minimum      
Debt Information [Abstract]      
Weighted average interest rate (0.38%) (0.38%)  
Commercial paper | Maximum      
Debt Information [Abstract]      
Weighted average interest rate 0.97% 0.97%  
Current maturities of finance lease liabilities | Minimum      
Debt Information [Abstract]      
Effective interest rate 0.34% 0.34%  
Current maturities of finance lease liabilities | Maximum      
Debt Information [Abstract]      
Effective interest rate 14.01% 14.01%