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Debt and Financing Activities - Long-Term Debt (Details) |  | 12 Months Ended |
--- | --- | --- | ---
Feb. 17, 2017 USD ($) | Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($) | Mar. 31, 2015 USD ($) | Feb. 17, 2017 EUR (€) | Feb. 17, 2017 GBP (£)
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt outstanding |  | $ 8,362,000,000 | $ 8,107,000,000 |  |  |
Net proceeds from issuance of notes |  | 1,824,000,000 | 0 | $ 3,000,000 |  |
Repayments of long-term debt |  | $ 1,601,000,000 | 1,598,000,000 | $ 353,000,000 |  |
Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds from Debt, Net of Issuance Costs | $ 1,800,000,000 |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  | 101.00% |  |  |  |
Repayments of long-term debt |  |  | 93,000,000 |  |  |
Long-term Debt, Current Maturities |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt outstanding |  | $ 1,057,000,000 | 1,610,000,000 |  |  |
0.63% Euro Notes due August 17, 2021 | Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate principal amount | € |  |  |  |  | € 600,000,000 |
Debt interest rate (percent) |  |  |  |  | 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 |  |  |  |
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] |  |  |  |  |  |
Aggregate principal amount | € |  |  |  |  | € 600,000,000 |
Debt interest rate (percent) |  |  |  |  | 1.50% | 1.50%
3.13% Sterling Notes due February 17, 2029 | Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate principal amount | £ |  |  |  |  |  | £ 450,000,000
Debt interest rate (percent) |  |  |  |  | 3.13% | 3.13%

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