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Debt - Schedule of Debt (Details)
9 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
EUR (€)
Dec. 31, 2020
GBP (£)
Sep. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Short-term debt and current maturities of long-term debt          
Euro-denominated commercial paper $ 112,000,000       $ 542,000,000
Current maturities of long-term debt 252,000,000       290,000,000
Current maturities of finance lease liabilities 431,000,000       444,000,000
Short-term debt and current maturities of long-term debt 795,000,000       1,276,000,000
Long-term debt, net of current maturities          
Finance lease liabilities 976,000,000       1,046,000,000
Long-term debt 6,127,000,000       9,406,000,000
Less: current maturities 683,000,000       734,000,000
Long-term debt, net of current maturities 5,444,000,000       8,672,000,000
Term loan | Term Loan Payable, AUD, Due 2022          
Long-term debt, net of current maturities          
Long-term debt 0       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 $ 0       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 $ 488,000,000       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 $ 0       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 $ 339,000,000       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 $ 792,000,000       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 $ 269,000,000       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 0       11,000,000
Borrowings for assets acquired under long-term financing          
Long-term debt, net of current maturities          
Long-term debt 742,000,000       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 $ 6,000,000       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%    
EURIBOR | Minimum | Term loan | Term Loan Payable, EUR, Due 2023-2024          
Debt Information [Abstract]          
Basis spread on variable rate 0.55%        
EURIBOR | Maximum | Term loan | Term Loan Payable, EUR, Due 2023-2024          
Debt Information [Abstract]          
Basis spread on variable rate 1.05%        
Commercial paper          
Debt Information [Abstract]          
Maximum borrowing capacity | €   € 1,000,000,000      
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 $ 0       $ 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%