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Debt - Schedule of Debt (Details)	3 Months Ended
Debt - Schedule of Debt (Details)	Jun. 30, 2019 EUR (€)	Jun. 30, 2019 USD ($)	Jun. 30, 2019 GBP (£)	Mar. 31, 2019 USD ($)
Short-term debt and current maturities of long-term debt
Euro-denominated commercial paper		$ 704,000,000		$ 694,000,000
Current maturities of long-term debt		329,000,000		766,000,000
Current maturities of finance lease liabilities		478,000,000
Current maturities of finance lease liabilities				482,000,000
Short-term debt and current maturities of long-term debt		1,511,000,000		1,942,000,000
Long-term debt, net of current maturities
Long-term debt		8,700,000,000		6,718,000,000
Finance lease liabilities		1,216,000,000
Finance lease liabilities				1,127,000,000
Less: current maturities		807,000,000		1,248,000,000
Long-term debt, net of current maturities		7,893,000,000		5,470,000,000
Term loan \| Term Loan Payable, AUD, Due 2021
Long-term debt, net of current maturities
Long-term debt		561,000,000		567,000,000
Term loan \| Term Loan Payable, GBP, Due 2022
Long-term debt, net of current maturities
Long-term debt		571,000,000		583,000,000
Term loan \| Term Loan Payable, EUR, Due 2022
Long-term debt, net of current maturities
Long-term debt		$ 852,000,000		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		$ 852,000,000		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		$ 498,000,000		0
Debt Information [Abstract]
Effective interest rate	3.67%	3.67%	3.67%
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		$ 277,000,000		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		$ 315,000,000		322,000,000
Debt Information [Abstract]
Effective interest rate	2.75%	2.75%	2.75%
Face amount	€ 250,000,000		£ 250,000,000
Senior notes \| Senior notes due 2026
Long-term debt, net of current maturities
Long-term debt		$ 735,000,000		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		21,000,000		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		707,000,000		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		$ 76,000,000		$ 109,000,000
Minimum \| Term loan \| Term Loan Payable, AUD, Due 2021
Debt Information [Abstract]
Effective interest rate	2.29%	2.29%	2.29%
Minimum \| Term loan \| Term Loan Payable, GBP, Due 2022
Debt Information [Abstract]
Effective interest rate	1.60%	1.60%	1.60%
Minimum \| Senior notes \| Senior notes due 2021
Debt Information [Abstract]
Effective interest rate	3.47%	3.47%	3.47%
Minimum \| Secured debt \| Lease credit facility
Debt Information [Abstract]
Effective interest rate	3.44%	3.44%	3.44%
Minimum \| Finance lease liabilities
Debt Information [Abstract]
Effective interest rate	1.10%	1.10%	1.10%
Minimum \| Borrowings for assets acquired under long-term financing
Debt Information [Abstract]
Effective interest rate	1.76%	1.76%	1.76%
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	1.62%	1.62%	1.62%
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	11.70%	11.70%	11.70%
Maximum \| Borrowings for assets acquired under long-term financing
Debt Information [Abstract]
Effective interest rate	4.50%	4.50%	4.50%
Maximum \| Other borrowings
Debt Information [Abstract]
Effective interest rate	7.40%	7.40%	7.40%
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%
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%
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	(0.10%)	(0.10%)	(0.10%)
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	1.10%	1.10%	1.10%
Finance Lease Liabilities \| Maximum
Debt Information [Abstract]
Effective interest rate	11.70%	11.70%	11.70%