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Debt and Financing Activities - Long-Term Debt (Details)						12 Months Ended
	Mar. 26, 2018 USD ($)	Feb. 16, 2018 USD ($)	Feb. 12, 2018 EUR (€)	Feb. 07, 2018 USD ($)	Feb. 17, 2017 USD ($)	Mar. 31, 2018 EUR (€)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 EUR (€)	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Feb. 17, 2017 EUR (€)	Feb. 17, 2017 GBP (£)	Mar. 31, 2015
Debt Instrument [Line Items]
Total debt outstanding							$ 7,880,000,000		$ 8,362,000,000
Pre-tax loss on debt extinguishment							122,000,000		0	$ 0
Repayments of long-term debt							2,287,000,000		$ 1,601,000,000	1,598,000,000
Future principal payments of long-term debt in 2019							1,129,000,000
Future principal payments of long-term debt in 2020							353,000,000
Future principal payments of long-term debt in 2021							337,000,000
Future principal payments of long-term debt in 2022							634,000,000
Future principal payments of long-term debt in 2023							403,000,000
Future principal payments of long-term debt, thereafter							$ 5,024,000,000
Notes
Debt Instrument [Line Items]
Net proceeds from debt		$ 1,500,000,000			$ 1,800,000,000
Redemption price (percent)						101.00%	101.00%
Repayments of long-term debt										$ 93,000,000
1.40% Notes due March 15, 2018
Debt Instrument [Line Items]
Debt interest rate (percent)									1.40%
Repayments of long-term debt \| €						€ 500,000,000
Long-term Debt, Current Maturities
Debt Instrument [Line Items]
Total debt outstanding							$ 1,129,000,000		$ 1,057,000,000
Notes and Debentures Extinguished February 7, 2018 \| Notes
Debt Instrument [Line Items]
Aggregate consideration of debt paid to redeem debt				$ 1,050,000,000
Redemption price (percent)				100.00%
Debt redeemed				$ 936,000,000
Debt premiums				99,000,000
Unpaid interest				20,000,000
Pre-tax loss on debt extinguishment				109,000,000
After-tax loss on debt extinguishment				70,000,000
Amortization of debt premium				99,000,000
Write-off of debt issuance costs				$ 10,000,000
Floating Rate Euro Notes Due February Twelve Two Thousand and Twenty [Member] \| Notes
Debt Instrument [Line Items]
Total debt outstanding							337,000,000		0
Aggregate principal amount \| €			€ 250,000,000
Basis spread on variable rate (percent)			0.15%
1.63% Euro Notes due October 30, 2026 \| Notes
Debt Instrument [Line Items]
Total debt outstanding							$ 669,000,000		0
Aggregate principal amount \| €			€ 500,000,000
Debt interest rate (percent)			1.63%				1.63%
3.95% Notes due February 16, 2028 \| Notes
Debt Instrument [Line Items]
Total debt outstanding							$ 600,000,000		0
Aggregate principal amount		$ 600,000,000
Debt interest rate (percent)		3.95%					3.95%
0.63% Euro Notes due August 17, 2021 \| Notes
Debt Instrument [Line Items]
Total debt outstanding							$ 695,000,000		638,000,000
Aggregate principal amount \| €											€ 600,000,000
Debt interest rate (percent)							0.63%				0.63%	0.63%
4.00% Euro Bonds due October 18, 2016 \| Notes
Debt Instrument [Line Items]
Repayments of long-term debt									385,000,000
4.00% Euro Bonds due October 18, 2016 \| Notes Payable
Debt Instrument [Line Items]
Repayments of long-term debt \| €								€ 350,000,000
4.50% Euro Bonds due April 26, 2017 \| Notes
Debt Instrument [Line Items]
Total debt outstanding							$ 0		533,000,000
Debt interest rate (percent)							4.50%
Repayments of long-term debt \| €						€ 500,000,000
5.70% Notes due March 1, 2017 \| Notes
Debt Instrument [Line Items]
Debt interest rate (percent)										5.70%
Repayments of long-term debt									500,000,000
1.29% Notes Due March 10, 2017 \| Notes
Debt Instrument [Line Items]
Debt interest rate (percent)										1.29%
Repayments of long-term debt									700,000,000
Floating Rate Notes \| Notes
Debt Instrument [Line Items]
Repayments of long-term debt										$ 400,000,000
0.95% Notes Due December 4 2015 \| Notes
Debt Instrument [Line Items]
Debt interest rate (percent)													0.95%
Repayments of long-term debt										500,000,000
3.25% Notes Due March 1 2016 \| Notes
Debt Instrument [Line Items]
Debt interest rate (percent)													3.25%
Repayments of long-term debt										$ 600,000,000
1.50% Euro Notes due November 17, 2025 \| Notes
Debt Instrument [Line Items]
Total debt outstanding							$ 691,000,000		635,000,000
Aggregate principal amount \| €											€ 600,000,000
Debt interest rate (percent)							1.50%				1.50%	1.50%
3.13% Sterling Notes due February 17, 2029 \| Notes
Debt Instrument [Line Items]
Total debt outstanding							$ 630,000,000		564,000,000
Aggregate principal amount \| £												£ 450,000,000
Debt interest rate (percent)							3.13%				3.13%	3.13%
7.50% Notes due February 15, 2019 \| Notes
Debt Instrument [Line Items]
Total debt outstanding							$ 0		350,000,000
Debt interest rate (percent)	7.50%			7.50%			7.50%
Aggregate consideration of debt paid to redeem debt	$ 317,000,000
Redemption price (percent)	100.00%
Debt redeemed	$ 302,000,000
Debt premiums	13,000,000
Unpaid interest	2,000,000
Pre-tax loss on debt extinguishment	13,000,000
After-tax loss on debt extinguishment	$ 8,000,000
4.75% Notes due March 1, 2021 \| Notes
Debt Instrument [Line Items]
Total debt outstanding							$ 323,000,000		599,000,000
Debt interest rate (percent)				4.75%			4.75%
7.65% Debentures due March 1, 2027 \| Notes
Debt Instrument [Line Items]
Total debt outstanding							$ 167,000,000		175,000,000
Debt interest rate (percent)				7.65%			7.65%
6.00% Notes due March 1, 2041 \| Notes
Debt Instrument [Line Items]
Total debt outstanding							$ 282,000,000		493,000,000
Debt interest rate (percent)				6.00%			6.00%
4.88% Notes due March 15, 2044 \| Notes
Debt Instrument [Line Items]
Total debt outstanding							$ 411,000,000		$ 800,000,000
Debt interest rate (percent)				4.88%			4.88%