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Debt - Schedule of Debt (Details)
12 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2021
EUR (€)
Mar. 31, 2021
GBP (£)
Mar. 16, 2021
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Short-term debt and current maturities of long-term debt            
Commercial paper $ 213,000,000         $ 542,000,000
Current maturities of long-term debt 556,000,000         290,000,000
Current maturities of finance lease liabilities 398,000,000         444,000,000
Short-term debt and current maturities of long-term debt 1,167,000,000         1,276,000,000
Long-term debt, net of current maturities            
Finance lease liabilities 894,000,000         1,046,000,000
Long-term debt 5,299,000,000         9,406,000,000
Less: current maturities 954,000,000         734,000,000
Long-term debt, net of current maturities 4,345,000,000         8,672,000,000
Borrowings for assets acquired under long-term financing            
Long-term debt, net of current maturities            
Long-term debt, net of current maturities 672,000,000         802,000,000
Mandatorily redeemable preferred stock outstanding            
Long-term debt, net of current maturities            
Long-term debt, net of current maturities $ 63,000,000         62,000,000
Debt Information [Abstract]            
Effective interest rate 6.00% 6.00% 6.00%      
Other borrowings            
Long-term debt, net of current maturities            
Long-term debt, net of current maturities $ 5,000,000         70,000,000
Minimum | Finance lease liabilities            
Debt Information [Abstract]            
Effective interest rate 0.59% 0.59% 0.59%      
Minimum | Borrowings for assets acquired under long-term financing            
Debt Information [Abstract]            
Effective interest rate 0.00% 0.00% 0.00%      
Maximum | Finance lease liabilities            
Debt Information [Abstract]            
Effective interest rate 19.79% 19.79% 19.79%      
Maximum | Borrowings for assets acquired under long-term financing            
Debt Information [Abstract]            
Effective interest rate 6.39% 6.39% 6.39%      
Revolving credit facility | Line of credit            
Long-term debt, net of current maturities            
Long-term debt, net of current maturities $ 0         1,500,000,000
Debt Information [Abstract]            
Amount of multi-year committed revolving credit facility         $ 4,000,000,000.0  
Revolving credit facility | Minimum | Line of credit            
Debt Information [Abstract]            
Effective interest rate 1.26% 1.26% 1.26%      
Revolving credit facility | Maximum | Line of credit            
Debt Information [Abstract]            
Effective interest rate 2.08% 2.08% 2.08%      
Term Loan Payable, AUD, Due 2022 | Loans payable            
Long-term debt, net of current maturities            
Long-term debt, net of current maturities $ 0         489,000,000
Term Loan Payable, AUD, Due 2022 | Minimum | Loans payable            
Debt Information [Abstract]            
Effective interest rate 0.94% 0.94% 0.94%      
Term Loan Payable, AUD, Due 2022 | Maximum | Loans payable            
Debt Information [Abstract]            
Effective interest rate 0.96% 0.96% 0.96%      
Term Loan Payable, GBP, Due 2022 | Loans payable            
Long-term debt, net of current maturities            
Long-term debt, net of current maturities $ 0         556,000,000
Term Loan Payable, GBP, Due 2022 | Minimum | Loans payable            
Debt Information [Abstract]            
Effective interest rate 0.88% 0.88% 0.88%      
Term Loan Payable, GBP, Due 2022 | Maximum | Loans payable            
Debt Information [Abstract]            
Effective interest rate 1.46% 1.46% 1.46%      
Term Loan Payable, EUR, Due 2022-2023 | Loans payable            
Long-term debt, net of current maturities            
Long-term debt, net of current maturities $ 0         822,000,000
Debt Information [Abstract]            
Effective interest rate 0.65% 0.65% 0.65%      
Term Loan Payable, EUR, Due 2023-2024 | Loans payable            
Long-term debt, net of current maturities            
Long-term debt, net of current maturities $ 469,000,000         821,000,000
Debt Information [Abstract]            
Effective interest rate 0.80% 0.80% 0.80%      
Term Loan Payable, EUR, Due 2023-2024 | EURIBOR | Minimum | Loans payable            
Debt Information [Abstract]            
Basis spread on variable rate 0.55%          
Term Loan Payable, EUR, Due 2023-2024 | EURIBOR | Maximum | Loans payable            
Debt Information [Abstract]            
Basis spread on variable rate 1.05%          
Term Loan Payable, USD, Due 2025 | Loans payable            
Long-term debt, net of current maturities            
Long-term debt, net of current maturities $ 0         480,000,000
Term Loan Payable, USD, Due 2025 | Minimum | Loans payable            
Debt Information [Abstract]            
Effective interest rate 1.40% 1.40% 1.40%      
Term Loan Payable, USD, Due 2025 | Maximum | Loans payable            
Debt Information [Abstract]            
Effective interest rate 2.24% 2.24% 2.24%      
Senior Notes Due 2023 | Senior notes            
Long-term debt, net of current maturities            
Long-term debt, net of current maturities $ 154,000,000         276,000,000
Debt Information [Abstract]            
Effective interest rate 4.45% 4.45% 4.45% 4.45%    
Face amount $ 274,000,000          
Senior Notes, Due 2023 | Senior notes            
Long-term debt, net of current maturities            
Long-term debt, net of current maturities $ 165,000,000         172,000,000
Debt Information [Abstract]            
Effective interest rate 4.45% 4.45% 4.45% 4.45%    
Face amount $ 171,000,000          
Senior Notes Due 2025 | Senior notes            
Long-term debt, net of current maturities            
Long-term debt, net of current maturities $ 504,000,000         505,000,000
Debt Information [Abstract]            
Effective interest rate 4.25% 4.25% 4.25%      
Face amount $ 500,000,000          
Senior Notes, Due 2026 | Senior notes            
Long-term debt, net of current maturities            
Long-term debt, net of current maturities $ 496,000,000         0
Debt Information [Abstract]            
Effective interest rate 4.13% 4.13% 4.13%   4.13%  
Face amount $ 500,000,000       $ 500,000,000  
Senior Notes Due 2025 | Senior notes            
Long-term debt, net of current maturities            
Long-term debt, net of current maturities $ 343,000,000         307,000,000
Debt Information [Abstract]            
Effective interest rate 2.75% 2.75% 2.75%      
Face amount | £     £ 250,000,000      
Senior Notes Due 2026 | Senior notes            
Long-term debt, net of current maturities            
Long-term debt, net of current maturities $ 760,000,000         709,000,000
Debt Information [Abstract]            
Effective interest rate 1.75% 1.75% 1.75%      
Face amount | €   € 650,000,000        
Senior Notes Due 2028 | Senior notes            
Long-term debt, net of current maturities            
Long-term debt, net of current maturities $ 506,000,000         507,000,000
Debt Information [Abstract]            
Effective interest rate 4.75% 4.75% 4.75%      
Face amount $ 500,000,000          
Senior Notes Due 2030 | Senior notes            
Long-term debt, net of current maturities            
Long-term debt, net of current maturities $ 268,000,000         271,000,000
Debt Information [Abstract]            
Effective interest rate 7.45% 7.45% 7.45%      
Face amount $ 234,000,000          
Lease Credit Facility Due 2022-2023 | Secured debt            
Long-term debt, net of current maturities            
Long-term debt, net of current maturities $ 0         $ 11,000,000
Lease Credit Facility Due 2022-2023 | Minimum | Secured debt            
Debt Information [Abstract]            
Effective interest rate 1.15% 1.15% 1.15%      
Lease Credit Facility Due 2022-2023 | Maximum | Secured debt            
Debt Information [Abstract]            
Effective interest rate 1.99% 1.99% 1.99%      
Commercial paper            
Debt Information [Abstract]            
Amount of multi-year committed revolving credit facility | €   € 1,000,000,000        
Commercial paper | Minimum            
Debt Information [Abstract]            
Weighted average interest rate (0.39%) (0.39%) (0.39%)      
Commercial paper | Maximum            
Debt Information [Abstract]            
Weighted average interest rate 0.44% 0.44% 0.44%      
Current maturities of finance lease liabilities | Minimum            
Debt Information [Abstract]            
Effective interest rate 0.59% 0.59% 0.59%      
Current maturities of finance lease liabilities | Maximum            
Debt Information [Abstract]            
Effective interest rate 19.79% 19.79% 19.79%