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Financing Arrangements - Additional Information (Details) - USD ($) | 9 Months Ended |  |
--- | --- | --- | ---
Feb. 28, 2018 | Nov. 30, 2017 | May 31, 2017
Line Of Credit Facility [Line Items] |  |  |
Line of Credit Facility, Expiration Date | Nov. 13, 2020 |  |
Letter of Credit Maximum Sublimit Amount | $ 500,000,000 |  |
Financial Covenant Terms Ratio | 350.00% |  |
Financial Covenant Compliance Ratio | 220.00% |  |
Commercial paper outstanding | $ 800,000,000 |  |
Letters Of Credit Outstanding | 54,000,000 |  |
Long Term Debt Exclusive of Capital Leases Carrying Value | 16,700,000,000 |  | $ 14,900,000,000
Long Term Debt Exclusive Of Capital Leases Fair Value | $ 17,000,000,000 |  | $ 15,500,000,000
Long-term debt weighted-average interest rate | 3.60% |  |
Revolving Credit Facility [Member] |  |  |
Line Of Credit Facility [Line Items] |  |  |
Line of Credit Facility, Term | 5 years |  |
Line Of Credit Facility Maximum Borrowing Capacity | $ 2,000,000,000 | $ 1,750,000,000 |
Line of credit facility outstanding for future borrowings | 1,146,000,000 |  |
Senior Unsecured Debt due February 2028 and February 2048 [Member] |  |  |
Line Of Credit Facility [Line Items] |  |  |
Senior Unsecured Debt Issued | $ 1,500,000,000 |  |
Senior Unsecured Debt, Frequency of Periodic Interest Payment | semi-annually |  |
3.40% Senior Unsecured Debt due February 2028 [Member] |  |  |
Line Of Credit Facility [Line Items] |  |  |
Senior Unsecured Debt Issued | $ 500,000,000 |  |
Senior Unsecured Debt, Fixed Interest Rate Percentage | 3.40% |  |
Senior Unsecured Debt, Maturity Date | Feb. 29, 2028 |  |
4.05% Senior Unsecured Debt due February 2048 [Member] |  |  |
Line Of Credit Facility [Line Items] |  |  |
Senior Unsecured Debt Issued | $ 1,000,000,000 |  |
Senior Unsecured Debt, Fixed Interest Rate Percentage | 4.05% |  |
Senior Unsecured Debt, Maturity Date | Feb. 29, 2048 |  |

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- Definition Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(a)(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)(2)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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