Long-Term Debt (Details) |
6 Months Ended | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Nov. 30, 2015
USD ($)
|
Nov. 30, 2015
JPY (¥)
|
May. 31, 2015
USD ($)
|
Nov. 30, 2014
USD ($)
|
||||||||||||||
| Debt Instrument [Line Items] | |||||||||||||||||
| Long-term debt | $ 2,072,000,000 | $ 1,186,000,000 | |||||||||||||||
| Less current maturities | 5,000,000 | $ 107,000,000 | 107,000,000 | ||||||||||||||
| TOTAL LONG-TERM DEBT | $ 2,067,000,000 | $ 1,079,000,000 | 1,079,000,000 | ||||||||||||||
| Corporate Bond 5.15% Due October 15, 2015 | |||||||||||||||||
| Debt Instrument [Line Items] | |||||||||||||||||
| Debt Instrument, Maturity Date | Oct. 15, 2015 | ||||||||||||||||
| Corporate Bond 2.25% Due May 1, 2023 | |||||||||||||||||
| Debt Instrument [Line Items] | |||||||||||||||||
| Debt Instrument, Maturity Date | May 01, 2023 | ||||||||||||||||
| Corporate Bond 3.63% Due May 1, 2043 | |||||||||||||||||
| Debt Instrument [Line Items] | |||||||||||||||||
| Debt Instrument, Maturity Date | May 01, 2043 | ||||||||||||||||
| Corporate Bond, 3.88%, Due November 1, 2045 | |||||||||||||||||
| Debt Instrument [Line Items] | |||||||||||||||||
| Debt Instrument, Maturity Date | Nov. 01, 2045 | ||||||||||||||||
| Promissory Note 6.20 % Due April 1, 2017 | |||||||||||||||||
| Debt Instrument [Line Items] | |||||||||||||||||
| Debt Instrument, Maturity Date | Apr. 01, 2017 | ||||||||||||||||
| Promissory Note 6.79% Due January 1, 2018 | |||||||||||||||||
| Debt Instrument [Line Items] | |||||||||||||||||
| Debt Instrument, Maturity Date | Jan. 01, 2018 | ||||||||||||||||
| Japanese Yen Note 2.6% Maturing August 20, 2001 Through November 20, 2020 | |||||||||||||||||
| Debt Instrument [Line Items] | |||||||||||||||||
| Debt Instrument, Maturity Date | Nov. 20, 2020 | ||||||||||||||||
| Japanese Yen Note 2.0% Maturing August 20, 2001 Through November 20, 2020 | |||||||||||||||||
| Debt Instrument [Line Items] | |||||||||||||||||
| Debt Instrument, Maturity Date | Nov. 20, 2020 | ||||||||||||||||
| Corporate Bond Payable | Corporate Bond 5.15% Due October 15, 2015 | |||||||||||||||||
| Debt Instrument [Line Items] | |||||||||||||||||
| Original Principal | [1],[2] | $ 100,000,000 | |||||||||||||||
| Interest Rate | [1],[2] | 5.15% | 5.15% | ||||||||||||||
| Interest Payments | [1],[2] | Semi-Annually | |||||||||||||||
| Long-term debt | [1],[2] | $ 0 | 101,000,000 | ||||||||||||||
| Corporate Bond Payable | Corporate Bond 2.25% Due May 1, 2023 | |||||||||||||||||
| Debt Instrument [Line Items] | |||||||||||||||||
| Original Principal | [2],[3] | $ 500,000,000 | |||||||||||||||
| Interest Rate | [2],[3] | 2.25% | 2.25% | ||||||||||||||
| Interest Payments | [2],[3] | Semi-Annually | |||||||||||||||
| Long-term debt | [2],[3] | $ 499,000,000 | 499,000,000 | ||||||||||||||
| Corporate Bond Payable | Corporate Bond 3.63% Due May 1, 2043 | |||||||||||||||||
| Debt Instrument [Line Items] | |||||||||||||||||
| Original Principal | [2],[3] | $ 500,000,000 | |||||||||||||||
| Interest Rate | [2],[3] | 3.63% | 3.63% | ||||||||||||||
| Interest Payments | [2],[3] | Semi-Annually | |||||||||||||||
| Long-term debt | [2],[3] | $ 499,000,000 | 499,000,000 | ||||||||||||||
| Corporate Bond Payable | Corporate Bond, 3.88%, Due November 1, 2045 | |||||||||||||||||
| Debt Instrument [Line Items] | |||||||||||||||||
| Original Principal | [2],[4] | $ 1,000,000,000 | |||||||||||||||
| Interest Rate | [2],[4] | 3.875% | 3.875% | ||||||||||||||
| Interest Payments | [2],[4] | Semi-Annually | |||||||||||||||
| Long-term debt | [2],[4] | $ 991,000,000 | 0 | ||||||||||||||
| Notes Payable | Promissory Note 6.20 % Due April 1, 2017 | |||||||||||||||||
| Debt Instrument [Line Items] | |||||||||||||||||
| Original Principal | [5] | $ 40,000,000 | |||||||||||||||
| Interest Rate | [5] | 6.20% | 6.20% | ||||||||||||||
| Interest Payments | [5] | Monthly | |||||||||||||||
| Long-term debt | [5] | $ 38,000,000 | 39,000,000 | ||||||||||||||
| Notes Payable | Promissory Note 6.79% Due January 1, 2018 | |||||||||||||||||
| Debt Instrument [Line Items] | |||||||||||||||||
| Original Principal | [5] | $ 19,000,000 | |||||||||||||||
| Interest Rate | [5] | 6.79% | 6.79% | ||||||||||||||
| Interest Payments | [5] | Monthly | |||||||||||||||
| Long-term debt | [5] | $ 19,000,000 | 19,000,000 | ||||||||||||||
| Notes Payable | Japanese Yen Note 2.6% Maturing August 20, 2001 Through November 20, 2020 | |||||||||||||||||
| Debt Instrument [Line Items] | |||||||||||||||||
| Original Principal | ¥ | [6] | ¥ 9,000,000,000 | |||||||||||||||
| Interest Rate | [6] | 2.60% | 2.60% | ||||||||||||||
| Interest Payments | [6] | Quarterly | |||||||||||||||
| Long-term debt | [6] | $ 18,000,000 | 20,000,000 | ||||||||||||||
| Notes Payable | Japanese Yen Note 2.0% Maturing August 20, 2001 Through November 20, 2020 | |||||||||||||||||
| Debt Instrument [Line Items] | |||||||||||||||||
| Original Principal | ¥ | [6] | ¥ 4,000,000,000 | |||||||||||||||
| Interest Rate | [6] | 2.00% | 2.00% | ||||||||||||||
| Interest Payments | [6] | Quarterly | |||||||||||||||
| Long-term debt | [6] | $ 8,000,000 | $ 9,000,000 | ||||||||||||||
| |||||||||||||||||