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Debt - Schedule of Debt (Details)	6 Months Ended
Debt - Schedule of Debt (Details)	Sep. 30, 2019 USD ($)	Sep. 30, 2019 GBP (£)	Sep. 30, 2019 EUR (€)	Mar. 31, 2019 USD ($)
Short-term debt and current maturities of long-term debt
Euro-denominated commercial paper	$ 687,000,000			$ 694,000,000
Current maturities of long-term debt	296,000,000			766,000,000
Current maturities of finance lease liabilities	488,000,000
Current maturities of finance lease liabilities				482,000,000
Short-term debt and current maturities of long-term debt	1,471,000,000			1,942,000,000
Long-term debt, net of current maturities
Finance lease liabilities	1,176,000,000
Finance lease liabilities				1,127,000,000
Long-term debt	8,482,000,000			6,718,000,000
Less: current maturities	784,000,000			1,248,000,000
Long-term debt, net of current maturities	7,698,000,000			5,470,000,000
Term loan \| Term Loan Payable, AUD, Due 2021
Long-term debt, net of current maturities
Long-term debt	539,000,000			567,000,000
Term loan \| Term Loan Payable, GBP, Due 2022
Long-term debt, net of current maturities
Long-term debt	553,000,000			583,000,000
Term loan \| Term Loan Payable, EUR, Due 2022
Long-term debt, net of current maturities
Long-term debt	$ 816,000,000			0
Debt Information [Abstract]
Effective interest rate	0.65%	0.65%	0.65%
Term loan \| Term Loan Payable, EUR, Due 2023
Long-term debt, net of current maturities
Long-term debt	$ 816,000,000			0
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	$ 492,000,000			0
Senior notes \| Senior notes due 2020
Long-term debt, net of current maturities
Long-term debt	$ 0			502,000,000
Debt Information [Abstract]
Effective interest rate	2.88%	2.88%	2.88%
Face amount	$ 500,000,000
Senior notes \| Senior notes due 2021
Long-term debt, net of current maturities
Long-term debt	498,000,000			498,000,000
Debt Information [Abstract]
Face amount	500,000,000
Senior notes \| Senior notes due 2023
Long-term debt, net of current maturities
Long-term debt	$ 276,000,000			277,000,000
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	$ 506,000,000			506,000,000
Debt Information [Abstract]
Effective interest rate	4.25%	4.25%	4.25%
Face amount	$ 500,000,000
Senior notes \| Senior notes due 2025
Long-term debt, net of current maturities
Long-term debt	$ 305,000,000			322,000,000
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	$ 704,000,000			725,000,000
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	$ 508,000,000			508,000,000
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	$ 273,000,000			273,000,000
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	18,000,000			25,000,000
Borrowings for assets acquired under long-term financing
Long-term debt, net of current maturities
Borrowings for assets acquired under long-term financing	697,000,000			462,000,000
Mandatorily redeemable preferred stock outstanding
Long-term debt, net of current maturities
Long-term debt	$ 62,000,000			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	$ 71,000,000			$ 109,000,000
Minimum \| Term loan \| Term Loan Payable, AUD, Due 2021
Debt Information [Abstract]
Effective interest rate	1.87%	1.87%	1.87%
Minimum \| Term loan \| Term Loan Payable, GBP, Due 2022
Debt Information [Abstract]
Effective interest rate	1.57%	1.57%	1.57%
Minimum \| Term loan \| Term Loan Payable, USD, Due 2025
Debt Information [Abstract]
Effective interest rate	3.29%	3.29%	3.29%
Minimum \| Senior notes \| Senior notes due 2021
Debt Information [Abstract]
Effective interest rate	3.08%	3.08%	3.08%
Minimum \| Secured debt \| Lease credit facility
Debt Information [Abstract]
Effective interest rate	3.11%	3.11%	3.11%
Minimum \| Finance lease liabilities
Debt Information [Abstract]
Effective interest rate	1.06%	1.06%	1.06%
Minimum \| Borrowings for assets acquired under long-term financing
Debt Information [Abstract]
Effective interest rate	0.48%	0.48%	0.48%
Minimum \| Other borrowings
Debt Information [Abstract]
Effective interest rate	0.50%	0.50%	0.50%
Maximum \| Term loan \| Term Loan Payable, AUD, Due 2021
Debt Information [Abstract]
Effective interest rate	2.66%	2.66%	2.66%
Maximum \| Term loan \| Term Loan Payable, GBP, Due 2022
Debt Information [Abstract]
Effective interest rate	1.63%	1.63%	1.63%
Maximum \| Term loan \| Term Loan Payable, USD, Due 2025
Debt Information [Abstract]
Effective interest rate	3.67%	3.67%	3.67%
Maximum \| Senior notes \| Senior notes due 2021
Debt Information [Abstract]
Effective interest rate	3.69%	3.69%	3.69%
Maximum \| Secured debt \| Lease credit facility
Debt Information [Abstract]
Effective interest rate	3.50%	3.50%	3.50%
Maximum \| Finance lease liabilities
Debt Information [Abstract]
Effective interest rate	17.70%	17.70%	17.70%
Maximum \| Borrowings for assets acquired under long-term financing
Debt Information [Abstract]
Effective interest rate	5.78%	5.78%	5.78%
Maximum \| Other borrowings
Debt Information [Abstract]
Effective interest rate	7.40%	7.40%	7.40%
Bank Bill Swap Rate \| Minimum \| Term loan \| Term Loan Payable, AUD, Due 2021
Debt Information [Abstract]
Basis spread on variable rate	0.60%
Bank Bill Swap Rate \| Maximum \| Term loan \| Term Loan Payable, AUD, Due 2021
Debt Information [Abstract]
Basis spread on variable rate	0.95%
Three-month LIBOR \| Term loan \| Term Loan Payable, GBP, Due 2022
Debt Information [Abstract]
Basis spread on variable rate	0.80%
Three-month LIBOR \| Senior notes \| Senior notes due 2021
Debt Information [Abstract]
Basis spread on variable rate	0.95%
EURIBOR \| Minimum \| Term loan \| Term Loan Payable, EUR, Due 2022
Debt Information [Abstract]
Basis spread on variable rate	0.40%
EURIBOR \| Minimum \| Term loan \| Term Loan Payable, EUR, Due 2023
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
Debt Information [Abstract]
Basis spread on variable rate	0.90%
EURIBOR \| Maximum \| Term loan \| Term Loan Payable, EUR, Due 2023
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
Commercial paper \| Minimum
Debt Information [Abstract]
Weighted average interest rate, short- term debt	(0.21%)	(0.21%)	(0.21%)
Commercial paper \| Maximum
Debt Information [Abstract]
Weighted average interest rate, short- term debt	2.76%	2.76%	2.76%
Finance Lease Liabilities \| Minimum
Debt Information [Abstract]
Effective interest rate	1.06%	1.06%	1.06%
Finance Lease Liabilities \| Maximum
Debt Information [Abstract]
Effective interest rate	17.70%	17.70%	17.70%