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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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