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Debt - Schedule of Debt (Details)
6 Months Ended
Sep. 30, 2020
GBP (£)
Sep. 30, 2020
USD ($)
Sep. 30, 2020
GBP (£)
Sep. 30, 2020
EUR (€)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Short-term debt and current maturities of long-term debt            
Euro-denominated commercial paper   $ 900,000,000       $ 542,000,000
Current maturities of long-term debt   282,000,000       290,000,000
Current maturities of finance lease liabilities   440,000,000       444,000,000
Short-term debt and current maturities of long-term debt   1,622,000,000       1,276,000,000
Long-term debt, net of current maturities            
Finance lease liabilities   1,008,000,000       1,046,000,000
Long-term debt   8,768,000,000       9,406,000,000
Less: current maturities   722,000,000       734,000,000
Long-term debt, net of current maturities   8,046,000,000       8,672,000,000
Term loan | Term Loan Payable, AUD, Due 2022            
Long-term debt, net of current maturities            
Long-term debt   358,000,000       489,000,000
Term loan | Term Loan Payable, GBP, Due 2022            
Long-term debt, net of current maturities            
Long-term debt   0       556,000,000
Term loan | Term Loan Payable, EUR, Due 2022-2023            
Long-term debt, net of current maturities            
Long-term debt   $ 292,000,000       822,000,000
Debt Information [Abstract]            
Effective interest rate   0.65% 0.65% 0.65%    
Term loan | Term Loan Payable, EUR, Due 2023-2024            
Long-term debt, net of current maturities            
Long-term debt   $ 876,000,000       821,000,000
Debt Information [Abstract]            
Effective interest rate   0.80% 0.80% 0.80%    
Term loan | Term Loan Payable, USD, Due 2025            
Long-term debt, net of current maturities            
Long-term debt   $ 380,000,000       480,000,000
Senior notes | Senior notes due 2023            
Long-term debt, net of current maturities            
Long-term debt   $ 276,000,000       276,000,000
Debt Information [Abstract]            
Effective interest rate   4.45% 4.45% 4.45%    
Face amount   $ 274,000,000        
Senior notes | Senior notes due 2023            
Long-term debt, net of current maturities            
Long-term debt   $ 172,000,000       172,000,000
Debt Information [Abstract]            
Effective interest rate   4.45% 4.45% 4.45%    
Face amount   $ 171,000,000        
Senior notes | Senior notes due 2025            
Long-term debt, net of current maturities            
Long-term debt   $ 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 | Senior Notes, Due 2024            
Long-term debt, net of current maturities            
Long-term debt   $ 497,000,000       0
Debt Information [Abstract]            
Effective interest rate   4.00% 4.00% 4.00% 4.00%  
Face amount   $ 500,000,000     $ 500,000,000  
Senior notes | Senior Notes, Due 2026            
Long-term debt, net of current maturities            
Long-term debt   $ 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 | Senior notes due 2025            
Long-term debt, net of current maturities            
Long-term debt   $ 320,000,000       307,000,000
Debt Information [Abstract]            
Effective interest rate   2.75% 2.75% 2.75%    
Face amount | £     £ 250,000,000      
Senior notes | Senior notes due 2026            
Long-term debt, net of current maturities            
Long-term debt   $ 758,000,000       709,000,000
Debt Information [Abstract]            
Effective interest rate   1.75% 1.75% 1.75%    
Face amount | €       € 650,000,000    
Senior notes | Senior notes due 2028            
Long-term debt, net of current maturities            
Long-term debt   $ 507,000,000       507,000,000
Debt Information [Abstract]            
Effective interest rate   4.75% 4.75% 4.75%    
Face amount   $ 500,000,000        
Senior notes | Senior notes due 2030            
Long-term debt, net of current maturities            
Long-term debt   $ 270,000,000       271,000,000
Debt Information [Abstract]            
Effective interest rate   7.45% 7.45% 7.45%    
Face amount   $ 234,000,000        
Secured debt | Lease credit facility            
Long-term debt, net of current maturities            
Long-term debt   6,000,000       11,000,000
Borrowings for assets acquired under long-term financing            
Long-term debt, net of current maturities            
Long-term debt   730,000,000       802,000,000
Mandatorily redeemable preferred stock outstanding            
Long-term debt, net of current maturities            
Long-term debt   $ 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   $ 5,000,000       70,000,000
Minimum | Term loan | Term Loan Payable, AUD, Due 2022            
Debt Information [Abstract]            
Effective interest rate   0.94% 0.94% 0.94%    
Minimum | Term loan | Term Loan Payable, GBP, Due 2022            
Debt Information [Abstract]            
Effective interest rate   0.88% 0.88% 0.88%    
Minimum | Term loan | Term Loan Payable, USD, Due 2025            
Debt Information [Abstract]            
Effective interest rate   1.40% 1.40% 1.40%    
Minimum | Secured debt | Lease credit facility            
Debt Information [Abstract]            
Effective interest rate   1.15% 1.15% 1.15%    
Minimum | Finance lease liabilities            
Debt Information [Abstract]            
Effective interest rate   0.62% 0.62% 0.62%    
Minimum | Borrowings for assets acquired under long-term financing            
Debt Information [Abstract]            
Effective interest rate   0.00% 0.00% 0.00%    
Maximum | Term loan | Term Loan Payable, AUD, Due 2022            
Debt Information [Abstract]            
Effective interest rate   0.96% 0.96% 0.96%    
Maximum | Term loan | Term Loan Payable, GBP, Due 2022            
Debt Information [Abstract]            
Effective interest rate   1.46% 1.46% 1.46%    
Maximum | Term loan | Term Loan Payable, USD, Due 2025            
Debt Information [Abstract]            
Effective interest rate   2.24% 2.24% 2.24%    
Maximum | Secured debt | Lease credit facility            
Debt Information [Abstract]            
Effective interest rate   1.99% 1.99% 1.99%    
Maximum | Finance lease liabilities            
Debt Information [Abstract]            
Effective interest rate   18.47% 18.47% 18.47%    
Maximum | Borrowings for assets acquired under long-term financing            
Debt Information [Abstract]            
Effective interest rate   6.39% 6.39% 6.39%    
Bank Bill Swap Rate | Minimum | Term loan | Term Loan Payable, AUD, Due 2022            
Debt Information [Abstract]            
Basis spread on variable rate 0.60%          
Bank Bill Swap Rate | Maximum | Term loan | Term Loan Payable, AUD, Due 2022            
Debt Information [Abstract]            
Basis spread on variable rate 0.95%          
EURIBOR | Minimum | Term loan | Term Loan Payable, EUR, Due 2022-2023            
Debt Information [Abstract]            
Basis spread on variable rate 0.40%          
EURIBOR | Minimum | Term loan | Term Loan Payable, EUR, Due 2023-2024            
Debt Information [Abstract]            
Basis spread on variable rate 0.55%          
EURIBOR | Minimum | Term loan | Term Loan Payable, USD, Due 2025            
Debt Information [Abstract]            
Basis spread on variable rate 1.00%          
EURIBOR | Maximum | Term loan | Term Loan Payable, EUR, Due 2022-2023            
Debt Information [Abstract]            
Basis spread on variable rate 0.90%          
EURIBOR | Maximum | Term loan | Term Loan Payable, EUR, Due 2023-2024            
Debt Information [Abstract]            
Basis spread on variable rate 1.05%          
EURIBOR | Maximum | Term loan | Term Loan Payable, USD, Due 2025            
Debt Information [Abstract]            
Basis spread on variable rate 1.50%          
Base Rate | Minimum | Term loan | Term Loan Payable, USD, Due 2025            
Debt Information [Abstract]            
Basis spread on variable rate 0.00%          
Base Rate | Maximum | Term loan | Term Loan Payable, USD, Due 2025            
Debt Information [Abstract]            
Basis spread on variable rate 0.50%          
Commercial paper            
Debt Information [Abstract]            
Maximum borrowing capacity | €       € 1,000,000,000    
Debt issued | £ £ 600,000,000          
Commercial paper | Minimum            
Debt Information [Abstract]            
Weighted average interest rate, short- term debt   (0.22%) (0.22%) (0.22%)    
Commercial paper | Maximum            
Debt Information [Abstract]            
Weighted average interest rate, short- term debt   0.44% 0.44% 0.44%    
Finance Lease Liabilities | Minimum            
Debt Information [Abstract]            
Effective interest rate   0.62% 0.62% 0.62%    
Finance Lease Liabilities | Maximum            
Debt Information [Abstract]            
Effective interest rate   18.47% 18.47% 18.47%    
Revolving credit facility | Line of Credit            
Long-term debt, net of current maturities            
Long-term debt   $ 1,250,000,000       $ 1,500,000,000
Debt Information [Abstract]            
Maximum borrowing capacity   $ 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%