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Benefit Plans Contributions (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Mar. 31, 2016 | Mar. 31, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Other Pension Plans, Defined Benefit |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |
Contributions |  | $ 138 |  |  | $ 275
Other Post-retirement Benefits |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |
Contributions |  | 21 | $ 21 |  |
Supplemental Employee Retirement Plan |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |
Contributions |  | $ 6 | $ 7 |  |
Scenario, Forecast | Other Pension Plans, Defined Benefit |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |
Contributions | $ 137 |  |  | $ 275 |

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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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