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Debt and Financing Activities - Schedule Of Long-Term Debt (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Mar. 05, 2014
Debt Instrument [Line Items] |  |  |
Total debt | $ 8,147 | $ 9,709 |
Less current portion | (1,612) | (1,529) |
Total long-term debt | 6,535 | 8,180 |
Floating Rate Notes due September 10, 2015 |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | $ 0 | 400 |
Debt maturity date | Sep. 10, 2015 |  |
0.95% Notes due December 4, 2015 |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | $ 0 | 500 |
Debt interest rate | 0.95% |  |
Debt maturity date | Dec. 04, 2015 |  |
3.25% Notes due March 1, 2016 |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | $ 0 | 600 |
Debt interest rate | 3.25% |  |
Debt maturity date | Mar. 01, 2016 |  |
5.70% Notes due March 1, 2017 |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | $ 500 | 500 |
Debt interest rate | 5.70% |  |
Debt maturity date | Mar. 01, 2017 |  |
1.29% Notes due March 10, 2017 |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | $ 700 | 700 |
Debt interest rate | 1.29% |  | 1.29%
Debt maturity date | Mar. 10, 2017 |  |
1.40% Notes due March 15, 2018 |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | $ 500 | 499 |
Debt interest rate | 1.40% |  |
Debt maturity date | Mar. 15, 2018 |  |
7.50% Notes due February 15, 2019 |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | $ 350 | 349 |
Debt interest rate | 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 | 2.28% |  | 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 | 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 | 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 | 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 | 3.80% |  | 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 | 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 | 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 | 4.88% |  | 4.88%
Debt maturity date | Mar. 15, 2044 |  |
4.00% Bonds due October 18, 2016 |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | $ 403 | 388 |
Debt interest rate | 4.00% |  |
Debt maturity date | Oct. 18, 2016 |  |
4.50% Bonds due April 26, 2017 |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | $ 583 | 563 |
Debt interest rate | 4.50% |  |
Debt maturity date | Apr. 26, 2017 |  |
Lease and other obligations |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | $ 44 | $ 143 |

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