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Debt and Financing Activities - Long-Term Debt (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Mar. 05, 2014 | Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2014
Debt Instrument [Line Items] |  |  |  |
Total debt outstanding |  | $ 8,147,000,000 | $ 9,709,000,000 |
Net proceeds from issuance of notes | $ 4,068,000,000 | $ 0 | 3,000,000 | $ 4,124,000,000
Days notice for redemption prior to maturity |  | 30 days |  |
Redemption purchase offer |  | 101.00% |  |
Floating Rate Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt outstanding |  | $ 0 | 400,000,000 |
Aggregate principal amount | 400,000,000 |  |  |
2017 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt outstanding |  | $ 700,000,000 | 700,000,000 |
Aggregate principal amount | $ 700,000,000 |  |  |
Debt interest rate | 1.29% | 1.29% |  |
2019 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt outstanding |  | $ 1,100,000,000 | 1,100,000,000 |
Aggregate principal amount | $ 1,100,000,000 |  |  |
Debt interest rate | 2.28% | 2.28% |  |
2024 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt outstanding |  | $ 1,100,000,000 | 1,100,000,000 |
Aggregate principal amount | $ 1,100,000,000 |  |  |
Debt interest rate | 3.80% | 3.80% |  |
2044 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt outstanding |  | $ 800,000,000 | 800,000,000 |
Aggregate principal amount | $ 800,000,000 |  |  |
Debt interest rate | 4.88% | 4.88% |  |
Long-term Debt, Current Maturities |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt outstanding |  | $ 1,612,000,000 | $ 1,529,000,000 |

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