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Retirement Plans (Details 3) - USD ($) $ in Millions | 1 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 17, 2016 | Feb. 29, 2016 | Feb. 28, 2015
Pension Plan Contributions [Line Items] |  |  |
Defined Benefit Plan Contributions By Employer |  | $ 495 | $ 495
Required U.S. Pension Plan Contribution [Member] |  |  |
Pension Plan Contributions [Line Items] |  |  |
Defined Benefit Plan Contributions By Employer |  | 8 | 380
Voluntary U.S. Pension Plan Contribution [Member] |  |  |
Pension Plan Contributions [Line Items] |  |  |
Defined Benefit Plan Contributions By Employer |  | $ 487 | $ 115
Pension Plan Contribution Subsequent Event [Member] |  |  |
Pension Plan Contributions [Line Items] |  |  |
Defined Benefit Plan Contributions By Employer | $ 165 |  |

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- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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