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Debt and Financing Activities - Schedule Of Long-Term Debt (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2018 | Mar. 26, 2018 | Feb. 16, 2018 | Feb. 12, 2018 | Feb. 07, 2018 | Mar. 31, 2017 | Feb. 17, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total debt | $ 7,880 |  |  |  |  | $ 8,362 |
Less: Current portion | (1,129) |  |  |  |  | (1,057) |
Total long-term debt | 6,751 |  |  |  |  | 7,305 |
Notes | 1.40% Notes due March 15, 2018 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total debt | $ 0 |  |  |  |  | 500 |
Debt interest rate (percent) | 1.40% |  |  |  |  |  |
Debt maturity date | Mar. 15, 2018 |  |  |  |  |  |
Notes | 7.50% Notes due February 15, 2019 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total debt | $ 0 |  |  |  |  | 350 |
Debt interest rate (percent) | 7.50% | 7.50% |  |  | 7.50% |  |
Debt maturity date | Feb. 15, 2019 |  |  |  |  |  |
Notes | 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 |  |  |  |  |  |
Notes | 4.75% Notes due March 1, 2021 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total debt | $ 323 |  |  |  |  | 599 |
Debt interest rate (percent) | 4.75% |  |  |  | 4.75% |  |
Debt maturity date | Mar. 01, 2021 |  |  |  |  |  |
Notes | 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 |  |  |  |  |  |
Notes | 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 |  |  |  |  |  |
Notes | 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 |  |  |  |  |  |
Notes | 7.65% Debentures due March 1, 2027 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total debt | $ 167 |  |  |  |  | 175 |
Debt interest rate (percent) | 7.65% |  |  |  | 7.65% |  |
Debt maturity date | Mar. 01, 2027 |  |  |  |  |  |
Notes | 3.95% Notes due February 16, 2028 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total debt | $ 600 |  |  |  |  | 0 |
Debt interest rate (percent) | 3.95% |  | 3.95% |  |  |  |
Debt maturity date | Feb. 16, 2028 |  |  |  |  |  |
Notes | 6.00% Notes due March 1, 2041 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total debt | $ 282 |  |  |  |  | 493 |
Debt interest rate (percent) | 6.00% |  |  |  | 6.00% |  |
Debt maturity date | Mar. 01, 2041 |  |  |  |  |  |
Notes | 4.88% Notes due March 15, 2044 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total debt | $ 411 |  |  |  |  | 800 |
Debt interest rate (percent) | 4.88% |  |  |  | 4.88% |  |
Debt maturity date | Mar. 15, 2044 |  |  |  |  |  |
Notes | 4.50% Euro Bonds due April 26, 2017 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total debt | $ 0 |  |  |  |  | 533 |
Debt interest rate (percent) | 4.50% |  |  |  |  |  |
Debt maturity date | Apr. 26, 2017 |  |  |  |  |  |
Notes | Floating Rate Euro Notes Due February Twelve Two Thousand and Twenty [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total debt | $ 337 |  |  |  |  | 0 |
Notes | 0.63% Euro Notes due August 17, 2021 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total debt | $ 695 |  |  |  |  | 638 |
Debt interest rate (percent) | 0.63% |  |  |  |  |  | 0.63%
Debt maturity date | Aug. 17, 2021 |  |  |  |  |  |
Notes | 1.50% Euro Notes due November 17, 2025 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total debt | $ 691 |  |  |  |  | 635 |
Debt interest rate (percent) | 1.50% |  |  |  |  |  | 1.50%
Debt maturity date | Nov. 17, 2025 |  |  |  |  |  |
Notes | 1.63% Euro Notes due October 30, 2026 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total debt | $ 669 |  |  |  |  | 0 |
Debt interest rate (percent) | 1.63% |  |  | 1.63% |  |  |
Debt maturity date | Oct. 30, 2026 |  |  |  |  |  |
Notes | 3.13% Sterling Notes due February 17, 2029 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total debt | $ 630 |  |  |  |  | 564 |
Debt interest rate (percent) | 3.13% |  |  |  |  |  | 3.13%
Debt maturity date | Feb. 17, 2029 |  |  |  |  |  |
Lease and other obligations |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total debt | $ 75 |  |  |  |  | $ 75 |

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