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Debt and Financing Activities - Schedule Of Long-Term Debt (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Debt Instrument [Line Items]
Total debt	$ 8,362	$ 8,107
Less: Current portion	(1,057)	(1,610)
Total long-term debt	7,305	6,497
5.70% Notes due March 1, 2017
Debt Instrument [Line Items]
Total debt	$ 0	500
Debt interest rate (percent)	5.70%
Debt maturity date	Mar. 01, 2017
1.29% Notes Due March 10, 2017
Debt Instrument [Line Items]
Total debt	$ 0	700
Debt interest rate (percent)	1.29%
Debt maturity date	Mar. 10, 2017
1.40% Notes due March 15, 2018
Debt Instrument [Line Items]
Total debt	$ 500	500
Debt interest rate (percent)	1.40%
Debt maturity date	Mar. 15, 2018
7.50% Notes due February 15, 2019
Debt Instrument [Line Items]
Total debt	$ 350	350
Debt interest rate (percent)	7.50%
Debt maturity date	Feb. 15, 2019
2.28% Notes due March 15, 2019
Debt Instrument [Line Items]
Total debt	$ 1,100	1,100
Debt interest rate (percent)	2.28%
Debt maturity date	Mar. 15, 2019
4.75% Notes due March 1, 2021
Debt Instrument [Line Items]
Total debt	$ 599	599
Debt interest rate (percent)	4.75%
Debt maturity date	Mar. 01, 2021
2.70% Notes due December 15, 2022
Debt Instrument [Line Items]
Total debt	$ 400	400
Debt interest rate (percent)	2.70%
Debt maturity date	Dec. 15, 2022
2.85% Notes due March 15, 2023
Debt Instrument [Line Items]
Total debt	$ 400	400
Debt interest rate (percent)	2.85%
Debt maturity date	Mar. 15, 2023
3.80% Notes due March 15, 2024
Debt Instrument [Line Items]
Total debt	$ 1,100	1,100
Debt interest rate (percent)	3.80%
Debt maturity date	Mar. 15, 2024
7.65% Debentures due March 1, 2027
Debt Instrument [Line Items]
Total debt	$ 175	175
Debt interest rate (percent)	7.65%
Debt maturity date	Mar. 01, 2027
6.00% Notes due March 1, 2041
Debt Instrument [Line Items]
Total debt	$ 493	493
Debt interest rate (percent)	6.00%
Debt maturity date	Mar. 01, 2041
4.88% Notes due March 15, 2044
Debt Instrument [Line Items]
Total debt	$ 800	800
Debt interest rate (percent)	4.88%
Debt maturity date	Mar. 15, 2044
4.00% Euro Bonds due October 18, 2016
Debt Instrument [Line Items]
Total debt	$ 0	403
Debt interest rate (percent)	4.00%
Debt maturity date	Oct. 18, 2016
4.50% Euro Bonds due April 26, 2017
Debt Instrument [Line Items]
Total debt	$ 533	583
Debt interest rate (percent)	4.50%
Debt maturity date	Apr. 26, 2017
0.63% Euro Notes due August 17, 2021
Debt Instrument [Line Items]
Total debt	$ 638	0
Debt interest rate (percent)	0.63%
Debt maturity date	Aug. 17, 2021
1.50% Euro Notes due November 17, 2025
Debt Instrument [Line Items]
Total debt	$ 635	0
Debt interest rate (percent)	1.50%
Debt maturity date	Nov. 17, 2025
3.13% Sterling Notes due February 17, 2029
Debt Instrument [Line Items]
Total debt	$ 564	0
Debt interest rate (percent)	3.13%
Debt maturity date	Feb. 17, 2029
Lease and other obligations
Debt Instrument [Line Items]
Total debt	$ 75	$ 4

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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